CN105976848B - Mixed material bottoming processing method for digital film post-production - Google Patents
Mixed material bottoming processing method for digital film post-production Download PDFInfo
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Abstract
The invention discloses a mixed material bottoming processing method for digital film post-production, which adopts data processing equipment to perform bottoming processing on a mixed material to be processed; the mixed material to be processed comprises a plurality of original movie materials which are respectively stored in a plurality of original material storage disks; the bottom covering treatment process comprises the following steps: firstly, connecting and mounting an original material storage disc; secondly, scanning the original material and generating an index file; thirdly, loading a clip decision table file: the data processing equipment calls a file loading module to load the editing decision table file; fourthly, positioning and screening the effective material segments of the original material: respectively positioning and screening effective material segments of each original film material in the mixed material to be processed; and fifthly, connecting and storing the target material storage disk. The method has the advantages of simple steps, reasonable design, convenient implementation and good use effect, can effectively reduce the online storage space of the material in the post-production process of the film, and can simply, conveniently and quickly complete the material bottoming process.
Description
Technical Field
The invention belongs to the technical field of digital film post-production, and particularly relates to a mixed material bottoming processing method for digital film post-production.
Background
In the whole process of digital production of film, the whole production team has increasingly urgent needs for process standardization and production efficiency improvement. At present, in the production process of digital films in China, the development and the use of an informatization technology are in a disjointed state to a certain extent, specific industrial requirements are provided in actual production, and the problem cannot be solved in the industry in time. The technical concept of the bottom covering is important in the post-production of digital movies, and comes from the film era, and mainly refers to the process of cutting and splicing a negative film according to a sample lens after finishing cutting a sample. After entering the digital movie stage, the concept of the set-bottom process is not changed, and in the digital movie production process, the set pair (Conform) link is located between the non-linear editing (NLE) link and the digital post production (Postproduction) link. The set pair is to select and assemble the used original material files on the digital post workstation according to the shot sequence determined by clipping for subsequent links, specifically, to match the originally shot digital picture files and to precisely perform digital assembly of shots according to the clipping decision list (EDL, edge decision list or Final Cut XML) files.
At present, the following three storage methods for the material in the digital movie production are available: the first is to use data tapes, the second is to use scattered bare disks, and the third is to use disk arrays. The storage mode of the data magnetic tape has the advantages of safety and stability in storage, the reading speed is low, the material bottoming process in the later period needs manual work, generally time is consumed for 6-7 days, and a manufacturer needs to keep beside the equipment all the time. The storage system of the disk array is high in equipment cost, and the cost of the disk array with large capacity at the movie level is more than 10W. Therefore, the most used mode at the early stage of shooting is to store in a scattered bare disk form, but in the post-production stage after shooting is completed, high equipment requirements are put forward for post-production companies, a large-capacity disk array is also needed, and the expenditure of the part is unreasonable caused by the current material bottoming process.
Therefore, a digital film set-bottom processing method capable of effectively reducing the online storage space of the material in the film post-production process and effectively improving the automation degree of the material set-bottom is urgently needed in the market.
Disclosure of Invention
The invention aims to solve the technical problem of providing a mixed material bottoming processing method for the post-production of the digital film, aiming at the defects in the prior art, the method has the advantages of simple steps, reasonable design, convenient implementation and good use effect, can effectively reduce the online storage space of the material in the post-production process of the film, and can simply, conveniently and quickly complete the material bottoming process.
In order to solve the technical problems, the invention adopts the technical scheme that: a mixed material bottoming processing method for digital film post-production is characterized in that: performing bottoming treatment on the mixed material to be treated by adopting data processing equipment; the mixed material to be processed comprises a plurality of original film materials which are respectively stored in a plurality of original material storage disks, wherein the original film materials are obtained by shooting with a digital film camera;
when the bottom covering treatment is carried out on the mixed material to be treated, the method comprises the following steps:
step one, connecting and mounting an original material storage disk: after the plurality of original material storage disks are respectively connected with data processing equipment through data interfaces, the data processing equipment calls a memory mounting module to mount the plurality of original material storage disks;
step two, scanning the original material and generating an index file, wherein the process comprises the following steps:
step 201, original material scanning and material basic information extraction: the data processing equipment calls a material scanning module to respectively scan the original film materials stored in the original material storage disks and extract material basic information of the original film materials;
the basic information of the material comprises a volume number, a field number, a lens number, time code information, a frame rate and resolution;
step 202, generating an original material index file: the data processing equipment calls an index file generation module to synchronously store the material basic information of each original movie material extracted in the step 201 to obtain an original material index file;
the original material index file stores material basic information of all original movie materials in the mixed material to be processed;
step three, loading a clip decision list file: the data processing equipment calls a file loading module to load a clip decision list file;
the editing decision table file is an editing decision table file generated when the transcoding file after the mixed material video to be processed is transcoded is edited;
fourthly, positioning and screening the effective material segments of the original material: the data processing equipment calls a positioning and screening module, and respectively positions and screens the effective material segments of all the original movie materials in the to-be-processed mixed material according to the clip decision table file loaded in the step three and the original material index file in the step 202 to obtain the effective material segments of all the original movie materials;
connecting and storing a target material storage disk: and after the target material storage disk is connected with the data processing equipment through the data interface, the data processing equipment calls the data storage module to copy and store the effective material segments of all the original movie materials obtained in the fourth step into the target material storage disk.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: a camera metadata information base is stored in the data processing equipment in the first step;
the camera metadata base stores camera metadata of a plurality of digital movie cameras with different models; the camera metadata for each model of digital cinema camera includes a performance index for that model of digital cinema camera;
the material basic information also includes camera metadata in step 201.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: in the third step, a decision table for clipping the transcoding file is stored in the clipping decision table file; the editing decision table file is an EDL file or an XML file.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: the editing decision table file is an editing decision table file output by Final Cut, Premiere or Avid video editing software.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: in the third step, a decision table for clipping the transcoding file is stored in the clipping decision table file;
the decision table comprises material information of the clipped material and clipping processing information when the clipped material is clipped; the material information of the edited material comprises the volume number of the material; the clipping processing information includes clipping point information when clipping is performed on the clipped material, the clipping point information including time code information of an in point and an out point;
in the fourth step, when the effective material segments of the original movie materials in the mixed material to be processed are respectively positioned and screened, the data processing device calls a positioning and screening module to match the material information and the clipping processing information in the clipping decision table file with the material basic information of the original movie materials in the original material index file in the step 202, so as to obtain the effective material segments of the original movie materials.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: when the effective material segments of all the original film materials are respectively positioned and screened in the fourth step, the positioning and screening methods of the effective material segments of all the original film materials are the same;
when the effective material segments of any one of the original movie materials are positioned and screened, the process is as follows:
step 401, determining original movie materials: finding out the original movie material from the mixed material to be processed according to the material information in the clip decision table file loaded in the third step and by combining the original material index file in the step 202;
step 402, positioning and screening: determining time code information of an in-point and an out-point when the original movie material is clipped according to the clipping processing information loaded in the clipping decision table file in the third step; and respectively setting the in point and the out point when the original movie material is edited according to the determined time code information of the in point and the out point to obtain the effective material segments of the original movie material.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: the basic information of the material in the first step also comprises a video type, wherein the video type is a sequence frame or a non-sequence frame;
when any one of the original movie materials is scanned in step 201, the video information of the original movie material is scanned one by one according to the sequence of the storage positions, and the video type of the original movie material is judged according to the scanning result;
when any effective material segment of the original film material is positioned and screened, the positioning and screening are performed according to the video type of the original film material judged in step 201: when the video type of the original movie material is judged to be a sequence frame in the step 201, positioning and screening are carried out according to the method in the step 402; when the video type of the original movie material is determined to be a non-sequential frame in step 201, the original movie material is used as an active material segment.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: the clipping processing information in the third step further comprises special effect processing information when clipping is carried out on the clipped material, wherein the special effect processing information is hard cutting, overlapped drawing or variable speed; before determining the time code information of the in-point and the out-point when the original movie material is edited in step 402, the data processing device further needs to call an editing decision table analysis module to identify the special effect processing information, and then determines the time code information of the in-point and the out-point when the original movie material is edited according to the identification result.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: when the time code information of the in-point and the out-point of the original movie material is determined according to the identification result, when the editing decision table analysis module identifies that the special effect processing information is hard switching, the time code information of the in-point and the out-point of the original movie material is determined according to the editing point information in the editing decision table file of the original movie material and by combining the frame rate of the original movie material extracted in the step 202 and the frame number of the editing point of the original movie material when the original movie material is edited; when the editing decision table analysis module identifies that the special effect processing information is the superimposed picture, determining time code information of an in-point and an out-point when the original movie material is edited by adopting the editing tangent point information in the editing decision table file of the original movie material and combining a method that the length of the superimposed picture is added to the original movie material except the in-point and the out-point of the editing; when the editing decision table analysis module identifies that the special effect processing information is variable speed, the length of the original film material used for editing is calculated according to the editing tangent point information in the editing decision table file of the original film material and the material variable speed, and then the time code information of the in-point and the out-point of the original film material during editing is determined according to the calculated length of the original film material used for editing.
The method for bottoming the mixed material for the post production of the digital film is characterized by comprising the following steps of: the mixed material to be processed in the first step is an original mixed material of the manufactured digital film;
after the connection and storage of a target material storage disk are completed in the step five, the target material of the manufactured digital film is obtained, wherein the target material comprises effective material segments of all original film materials in the to-be-processed mixed material;
and fifthly, after the target material storage disk is connected and stored, the data processing equipment (1) needs to calculate the shooting slice ratio, the average lens length and the average shooting number of the lenses of the manufactured digital film.
Compared with the prior art, the invention has the following advantages:
1. the method has simple steps, reasonable design and lower input cost.
2. The method is simple and convenient to operate and convenient to realize, mainly comprises five steps of raw material storage disk connection and mounting, raw material scanning and index file generation, editing decision table file loading, raw material effective material segment positioning and screening (namely material bottoming) and target material storage disk connection and storage, and can automatically complete the bottoming processing process within a few minutes. In the actual operation process, an original material index file is generated firstly, clipping information (namely material information of the material required in the digital movie production and clipping processing information such as speed change and picture folding of the material) is obtained according to a clipping decision table file, then material index information corresponding to the clipping information is searched in the original material index file according to the clipping information, and effective clipping materials of the original movie material determined by clipping and required for subsequent production are copied to a target material storage disc.
3. The invention has good use effect and high practical value, and provides a digital film standardized post-production set-bottom processing method, which can find out effective editing materials in original film materials through set-bottom, only store the found effective editing materials, effectively reduce the storage space of the original film materials, effectively improve the automation degree of the set-bottom of the materials, effectively reduce the cost of equipment and manpower in the digital film post-production process, organize the dispersed original film materials by using a low-price hard disk frame, analyze the effective original materials (namely effective material segments) related to each lens by using an editing decision table, effectively remove extra shooting materials through primary screening, reduce the storage space of the materials, improve the automation degree of the set-bottom of the materials, and reduce the cost of the post-production. The bottoming work period is reduced from 6-7 days to 1-2 days without participation of people, the workload of a producer is reduced, the storage space of a digital film is reduced from 30-40TB to 2-3TB, the equipment capital investment is saved by about 10W yuan, and the economic benefit is remarkable. In addition, the quality of the digital film product is improved due to the adoption of the function of the invention in the aspect of standardized production of the digital film, the expensive post-stage equipment is fully and effectively utilized (nearly ten million post-stage equipment is efficiently used), and the equipment loss is greatly reduced.
4. The method has wide application range and wide popularization and application prospect, and can connect multiple coils at one time in the process of setting the mixed material, automatically match the original film material and respectively and automatically process the sequence frame material and the non-sequence frame material. Meanwhile, the digital film cameras of the mainstream series of Alisma, RED, SONY, Canon and Blackmagic at present can be supported, and corresponding different types of original film materials can be processed.
In conclusion, the method has the advantages of simple steps, reasonable design, convenient implementation and good use effect, can effectively reduce the online storage space of the material in the post-production process of the film, and can simply, conveniently and quickly complete the material bottoming process.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
Fig. 2 is a schematic block diagram of the circuit of the data processing apparatus of the present invention with a source material storage disk and a target material storage disk.
Description of reference numerals:
1-a data processing device; 2, storing the original material in a disc; and 3, target material storage disc.
Detailed Description
As shown in fig. 1, in the method for background processing of a mixed material for post-production of a digital cinema, a data processing device 1 is adopted to perform background processing on the mixed material to be processed; the mixed material to be processed comprises a plurality of original film materials which are respectively stored in a plurality of original material storage disks 2, wherein the original film materials are obtained by shooting with a digital film camera;
when the bottom covering treatment is carried out on the mixed material to be treated, the method comprises the following steps:
step one, connecting and mounting an original material storage disk: with reference to fig. 2, after the plurality of raw material storage disks 2 are connected to the data processing device 1 through data interfaces, the data processing device 1 calls a memory mount module to mount the plurality of raw material storage disks 2;
step two, scanning the original material and generating an index file, wherein the process comprises the following steps:
step 201, original material scanning and material basic information extraction: the data processing equipment 1 calls a material scanning module to respectively scan the original film materials stored in the original material storage discs 2 and extracts material basic information of the original film materials;
the basic information of the material comprises a volume number, a field number, a lens number, time code information, a frame rate and resolution;
step 202, generating an original material index file: the data processing device 1 calls an index file generation module to synchronously store the material basic information of each original movie material extracted in step 201, so as to obtain an original material index file;
the original material index file stores material basic information of all original movie materials in the mixed material to be processed; the material basic information of each original movie material is the index information of the original movie material;
step three, loading a clip decision list file: the data processing equipment 1 calls a file loading module to load a clip decision list file;
the editing decision table file is an editing decision table file generated when the transcoding file after the mixed material video to be processed is transcoded is edited;
fourthly, positioning and screening the effective material segments of the original material: the data processing equipment 1 calls a positioning and screening module, and respectively positions and screens the effective material segments of each original film material in the to-be-processed mixed material according to the clip decision table file loaded in the step three and the original material index file in the step 202 to obtain the effective material segments of each original film material;
connecting and storing a target material storage disk: and after the target material storage disk 3 is connected with the data processing device 1 through the data interface, the data processing device 1 calls a data storage module to copy and store all the effective material segments of the original movie materials obtained in the fourth step into the target material storage disk 3.
And step four, the effective material segment of the original movie material is the material segment which is matched with the clipping information in the clipping decision table file in the original movie material. The clipping information includes material information of the clipped material and clipping processing information at the time of clipping the clipped material.
In actual use, the original film material is obtained by shooting with digital film cameras of different models or the same model. And, the original movie material is a digital picture file, also called a video file. The original material obtained by shooting with digital film cameras of different models comprises digital picture files of different formats, and the digital picture file of each format corresponds to the type number of the digital film camera used for shooting. Accordingly, the raw material obtained by shooting with the same model of digital cinema camera includes only one format of digital picture file.
In this embodiment, the original material storage disc 2 is a backup disc of a mixed material (i.e., the to-be-processed mixed material) obtained after the digital cinema shooting.
All the raw materials photographed by the produced digital cinema are stored in the plurality of raw material storage disks 2.
In this embodiment, a camera metadata information base is stored in the data processing device 1 in the first step;
the camera metadata base stores camera metadata of a plurality of digital movie cameras with different models; the camera metadata for each model of digital cinema camera includes a performance index for that model of digital cinema camera;
the material basic information also includes camera metadata in step 201.
In this embodiment, the performance index of the digital cinema camera in the camera metadata is specifically an index (including a frame rate, a resolution, and the like) related to the quality of a captured picture of the digital cinema camera, and is also referred to as a shooting parameter.
The camera metadata comprises shooting parameters and picture technical indexes of all pictures recorded by a camera end, certain computing resources and time are consumed during the extraction of the information, but when complex conditions of multiple cameras, multiple pictures of a single camera, mixed shooting materials and artificial errors generated in a shooting site are processed, the camera metadata is used for secondary matching processing to correct the condition that the index file cannot be matched or the matching errors are generated only for the first time, and therefore the loop-back accuracy and the loop-back success rate are greatly improved.
In this embodiment, in step three, a decision table for clipping the transcoded file is stored in the clipping decision table file; the editing decision table file is an EDL file or an XML file.
And the clip decision table file is a clip decision table file output by Final Cut, Premiere or Avid video clip software.
The decision list stored in the EDL file is a clipping decision list, and the decision list stored in the XML file is a clipping engineer decision list. And the editing decision table file is an editing time line which is finally generated after the transcoding file is edited and is directly output by video editing software.
In this embodiment, in step three, a decision table for clipping the transcoded file is stored in the clipping decision table file;
the decision table comprises material information of the clipped material and clipping processing information when the clipped material is clipped; the material information of the edited material comprises the volume number of the material; the clipping processing information includes clipping point information when clipping is performed on the clipped material, the clipping point information including time code information of an in point and an out point;
in the fourth step, when the effective material segments of the original movie materials in the mixed material to be processed are respectively located and screened, the data processing device 1 calls a locating and screening module to match the material information and the clipping processing information in the clipping decision table file with the material basic information of the original movie materials in the original material index file in the step 202, so as to obtain the effective material segments of the original movie materials.
In addition, when the effective material segments of all the original film materials are respectively positioned and screened in the fourth step, the positioning and screening methods of the effective material segments of all the original film materials are the same;
when the effective material segments of any one of the original movie materials are positioned and screened, the process is as follows:
step 401, determining original movie materials: finding out the original movie material from the mixed material to be processed according to the material information in the clip decision table file loaded in the third step and by combining the original material index file in the step 202;
step 402, positioning and screening: determining time code information of an in-point and an out-point when the original movie material is clipped according to the clipping processing information loaded in the clipping decision table file in the third step; and respectively setting the in point and the out point when the original movie material is edited according to the determined time code information of the in point and the out point to obtain the effective material segments of the original movie material.
The active material segments are active clip material.
In this embodiment, the material basic information in the first step further includes a video type, where the video type is a sequence frame or a non-sequence frame;
when any one of the original movie materials is scanned in step 201, the video information of the original movie material is scanned one by one according to the sequence of the storage positions, and the video type of the original movie material is judged according to the scanning result;
when any effective material segment of the original film material is positioned and screened, the positioning and screening are performed according to the video type of the original film material judged in step 201: when the video type of the original movie material is judged to be a sequence frame in the step 201, positioning and screening are carried out according to the method in the step 402; when the video type of the original movie material is determined to be a non-sequential frame in step 201, the original movie material is used as an active material segment.
Therefore, when the video type of the original movie material is determined to be a sequence frame in step 201, the original movie material is determined to be a sequence frame material, otherwise, the original movie material is determined to be a non-sequence frame material.
In this embodiment, the clipping processing information in step three further includes special effect processing information when clipping is performed on the clipped material, where the special effect processing information is hard cut, superimposed or variable speed; before determining the time code information of the in-point and the out-point when the original movie material is edited in step 402, the data processing device 1 further needs to invoke an editing decision table analysis module to identify the special effect processing information, and then determines the time code information of the in-point and the out-point when the original movie material is edited according to the identification result. When the time code information of the in-point and the out-point of the original movie material is determined according to the identification result, and when the editing decision table analysis module identifies that the special effect processing information is hard switching, the time code information of the in-point and the out-point of the original movie material is determined according to the editing contact point information in the editing decision table file of the original movie material and by combining the frame rate of the original movie material extracted in the step 202 and the frame number of the editing contact point of the original movie material during editing; when the editing decision table analysis module identifies that the special effect processing information is the superimposed picture, determining time code information of an in-point and an out-point when the original movie material is edited by adopting the editing tangent point information in the editing decision table file of the original movie material and combining a method that the length of the superimposed picture is added to the original movie material except the in-point and the out-point of the editing; when the editing decision table analysis module identifies that the special effect processing information is variable speed, the length of the original film material used for editing is calculated according to the editing tangent point information in the editing decision table file of the original film material and the material variable speed, and then the time code information of the in-point and the out-point of the original film material during editing is determined according to the calculated length of the original film material used for editing.
In this embodiment, the mixed material to be processed in the first step is an original mixed material of a manufactured digital movie;
after the connection and storage of a target material storage disk are completed in the step five, the target material of the manufactured digital film is obtained, wherein the target material comprises effective material segments of all original film materials in the to-be-processed mixed material;
and after the target material storage disk is connected and stored in the step five, the data processing equipment 1 also needs to calculate the shooting slice ratio, the average lens length and the average shooting number of the lenses of the manufactured digital film.
The data volume of a digital film generated in the shooting stage is between 30 and 40TB, after the proxy picture is clipped in a non-linear way, the digital film is set before the digital post-production, the original picture data used for the film slicing is between 2 and 3TB, the ratio of the shooting data volume to the film slicing use data volume is about 15:1, and the ratio is called the shooting film slicing ratio.
The final shot shown to the user in the movie is 1 shot selected by the editor and director in the editing stage, but the number of the 1 shot in the actual shooting is generally 5-10, the system can analyze the statistical data in the scanning stage, the average number of the shot of the piece is the average shot number of the shot, the average shot number is a statistical result, and objective data summarization can be provided in the form of a report.
One film has thousands of lenses, the system can count the total number of lenses, also can count the time length of each lens, the average lens length can be obtained by dividing the length of the film by the total number of the lenses, and meanwhile, the analysis can be carried out to determine which lenses are far larger than or far smaller than the average lens length. These are all part of the analytic reporting data.
In this embodiment, the material basic information further includes a material type, and the material type is a format type of a material file, and includes ari, dpx, mov, r3d, mxf, and the like.
In this embodiment, in step 201, the volume number is a serial number for storing the original movie material during shooting, the field number is a serial number of shooting fields during shooting the original movie material, the shot number is a serial number (referred to as a "mirror number" for short) of a number shot by the same performance during movie shooting, and the time code information is time code information automatically recorded by the digital movie camera during shooting the original movie material.
In step 201, when any of the original movie materials is scanned and the basic information of the material is extracted, all the shot pictures in the original movie material are scanned one by one according to the storage position sequence, and the basic information of the material of each shot picture is obtained according to the scanning result. Therefore, in actual scanning, a shot-by-shot traversal method is adopted for scanning, and the file type (i.e., material type), length, manufacturer type, and the like of each shot picture need to be analyzed in the traversal process.
In this embodiment, the digital cinema camera is an alicsa series camera of alesa, germany, a red dragon series camera of red, or a F65 series camera of sony, japan. Different companies compete in technology, and the types of shot materials are different and have clear characteristics. When the method is adopted to scan any original film material and extract the basic information of the material, the information such as the volume number, the time code, the lens number (also called the lens number), the resolution, the frame rate and the like in the material is extracted according to the characteristics and the characteristics of different types of materials.
When any one of the original movie materials is scanned and basic material information is extracted in step 201, each level of directory and file of the original movie material is scanned, a suffix of the file is determined, and for files with suffixes ari, dpx, mov, r3d, mxf and the like (the material types are ari, dpx, mov, r3d, mxf and the like respectively), the data processing apparatus 1 records a storage path of the file on the original material storage disk 1.
For the file with ari suffix, the name of the folder in the original path of the material is a shot number, and the file is generally volume number, resolution and field number information according to different types or recording units of the Alisma camera to the upper-level directory and the upper-level directory, wherein the information is important index information of the material;
for files with suffix r3d, the organization modes of files in red digital film camera directories of different versions are slightly different, the last-level directory generally contains r3d files and mov proxy files, at this time, the number and path information of r3d files are respectively judged and recorded, and the directory where the files are located and the upper-level and upper-level directories are respectively the information of lens numbers, field numbers and volume numbers;
the directory structure of files suffixed with dpx is similar to the files suffixed with ari, and the directory structure of files suffixed with mov and the files suffixed with mxf is similar to the files suffixed with r3 d.
Thus, after all the files are scanned, an original material index file including index information of all the original movie materials is generated. In this embodiment, when extracting the basic information of the material, it is also necessary to extract header file information of each original movie material, and record camera metadata of the first frame of each shot, and when these pieces of information are used to process complicated situations such as multiple frames, mixed materials, and human errors occurring in a shooting scene, the camera metadata is used to process the material of a lower layer.
In this embodiment, the present invention can scan and extract basic material information of the following four types of files: first class, compressed video, suffixes mov, mp4, mxf, etc.; second, encapsulated RAW format, suffixes r3d, mov (cineform RAW), mxf (sony RAW), etc.; the third type, sequence frame image format, suffixes dpx, tif, j2k, etc.; fourth class, sequential frame RAW format, suffixed ari, dng, exr, etc. The Elisa series camera uses ari format or mov format, the red dragon series camera uses r3d format and mov format, the Sony series camera generally uses mxf format, the dpx format is proposed by Kodak company, and the Elisa series camera is mainly applied to special effect shooting lenses at present, and the characteristics of various file formats are obtained by inquiring or looking up the data of camera manufacturers.
It is noted here that: when extracting the material basic information of the original movie material, there are 2 extraction modes, one is obtained by extracting the header file of the original movie material file for analysis, and the other is obtained by the directory structure information of the original movie material file. The first mode needs to perform file read-write operation, is suitable for complex conditions that an original movie material directory and a naming mode are modified by a third party and the like, but has certain calculation consumption; the second mode is very efficient and is suitable for the situation that the material naming complies with the movie industry specification and is not modified by third-party software, and the material naming method needs to be selected and used according to the two situations in the manufacturing process.
In this embodiment, the most commonly used clipping decision table file is a clipping decision table file output by the Final Cut video clipping software, the file includes multi-track timeline information, and the file is analyzed to obtain the volume number, the clipping point-in point-out point-in point information, and commonly used special effect processing information such as hard cutting, speed changing, folding, fade-in and fade-out, of the original material involved in clipping.
The method comprises the steps that after editing is completed, special effect processing information such as hard cutting, overlapping and variable speed needs to be judged on editing points (also called editing and cutting points) in an editing decision table file, the hard cutting needs to be converted into time codes (namely time code information) of an in point and an out point according to the frame number of the editing points and the shooting frame rate, the overlapping needs to be added with material length needed by overlapping beyond the in point and the out point according to the overlapping length, the variable speed needs to calculate the length of original materials used for editing according to the variable speed of the materials, the more complex variable speed overlapping can process variable speed firstly and then process overlapping parts, the in point and the length of the needed materials are obtained through analyzing and calculating of an editing decision table, and the method enters a fourth step, the fourth step is a positioning and screening process of effective material segments of the original materials, and.
When the material background is actually performed, the original movie material used for editing is background by matching the volume number, the file name and the time code information.
In this embodiment, when loading the clip decision table file, the clip decision table file is loaded and analyzed to obtain clip information, which includes information (i.e., material information) such as a volume number and a file name of a shooting material involved in the clip, and for a material of which the original movie material type is a sequence frame, time code information of an in-point and an out-point can be converted into digital number information, and the digital number uniquely specifies an in-point frame and an out-point frame of the original movie material in combination with the volume number; for the material with the original film material type in a non-sequence frame form, the bottoming process positions the original film material file according to the file name information and the volume number information. Then, entering a bottom covering process, finding the index information of the original movie material file and the camera metadata required by each cut shot by the bottom covering process, and positioning the original movie material files of different camera types by combining the shooting storage directory structure, the camera file naming specification and other information recorded in the original material index file through the shooting material metadata information (such as shot resolution, field number, shot number, boundary time code and other information) contained in the camera metadata to complete the screening process of the original movie material.
In this embodiment, in the fifth step, when the data processing device 1 calls the data storage module to copy and store the effective material segments of all the original movie materials obtained in the fourth step into the target material storage disk 2, the bottomed materials (i.e., the effective material segments of all the original movie materials obtained in the fourth step) are copied and stored according to the real storage paths and the file storage information of all the original movie materials in the original material index file.
In this embodiment, the data processing apparatus 1 is connected to the source material storage disk 2 and the target material storage disk 3 through USB3.0 interfaces, so that the data interfaces are USB3.0 interfaces.
In actual use, the original material storage disk 1 is inserted into the 10-disk-bit disk array, the blank hard disk (namely, the target material storage disk 3) is inserted into the target disk array, in the fifth step, positioning and editing required materials (namely, effective editing materials) from the original material storage disk 1 and copying the materials into the blank target material storage disk 3 are required to be completed, the copying progress is displayed in real time in the copying process, the blank disk is automatically distributed, and manual participation is not required. Therefore, the effective material (namely the effective clipping soviet words) obtained by the method can be directly transferred to a post-production toning platform and is in seamless connection with the current digital movie production toning process.
According to the content, after the digital movie shooting is finished, the materials (namely, the original movie materials) shot by the digital movie cameras with different models can be dispersedly stored in about 20 bare discs (namely, original material storage discs 2), and firstly, the materials need to be mounted on the data processing equipment 1, so that the non-real-time indexing of the materials is conveniently finished; then, an index file generation module is called to record information such as volume number, shot number, time code information, resolution, material type and the like of each original movie material (also called original shooting material) and form an original material index file. The material clipped in the movie industry is not a shot original movie material, the resolution and file of the original movie material are very large and are not suitable for clipping, therefore, the clipping is to complete the video transcoding work of a high-definition file on the basis of the original movie material in a shooting site and obtain the transcoded high-definition transcoded file, the high-definition transcoded file comprises a movie volume number, a shot number, time code information and the like, an EDL (electronic document language) or XML (extensible markup language) file output after the clipping is completed is an industry standard clipping decision table file, the clipping decision table file comprises all clipping cut point information and clipping special effect information in the clipping process, wherein the clipping cut point information is time code information of an in point and an out point in the clipping process, and the clipping special effect information is special effect processing information. When the clip decision table file is loaded in step three, the data processing device 1 calls a clip timeline analysis module to respectively analyze the clip cut point information and the clip special effect information in the clip decision table file. When the effective material segments of the original materials are positioned and screened in the fourth step, the effective editing materials of the original movie materials can be accurately determined according to the editing tangent point information and the editing special effect information obtained by analysis and the index information in the index file of the original materials, namely the range and the directory structure of the original sequence frame file required by editing the original movie materials. Finally, the data processing device 1 calls a data storage module to copy and store all the effective material segments of the original movie material obtained by positioning and screening into the target material storage disk 2, namely, the asynchronous copying is completed according to the actual online condition of the original movie material.
In this embodiment, after the data processing device 1 further needs to calculate the shooting slice ratio, the average lens length, and the average number of shots of the manufactured digital cinema, it also needs to call a parameter output module to output the calculated shooting slice ratio, the average lens length, and the average number of shots. And outputting in a report form during actual output. At this time, the material types are also output at the same time.
By adopting the method and the device, the original shot materials (namely the effective clipping materials) required for clipping the final picture can be extracted from a large amount (about 40 TB) of movie shooting materials (namely the original movie materials to be processed). The material background is to match the index information of the original movie material according to the volume number, the shot number, the time code information and the like in the clipping information of the clipping decision table, so as to achieve the accurate correspondence of the original shooting data (namely the original movie material) through the clipping information. Generally, the data size of a digital movie is set to extract about 2TB of data (i.e. effective clipping material) determined by clipping from about 40TB of original data (i.e. to-be-processed mixed material), and the movie film-slicing ratio is about 20: 1.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A mixed material bottoming processing method for digital film post-production is characterized in that: performing bottoming treatment on the mixed material to be treated by adopting data processing equipment (1); the mixed material to be processed comprises a plurality of original film materials which are respectively stored in a plurality of original material storage discs (2), wherein the original film materials are obtained by shooting with a digital film camera; the original movie material is a digital picture file;
when the bottom covering treatment is carried out on the mixed material to be treated, the method comprises the following steps:
step one, connecting and mounting an original material storage disk: after the plurality of original material storage disks (2) are respectively connected with a data processing device (1) through data interfaces, the data processing device (1) calls a memory mounting module to mount the plurality of original material storage disks (2) respectively;
a camera metadata information base is stored in the data processing equipment (1) in the first step;
the camera metadata information base stores camera metadata of a plurality of digital movie cameras with different models; the camera metadata for each model of digital cinema camera includes a performance index for that model of digital cinema camera;
step two, scanning the original material and generating an index file, wherein the process comprises the following steps:
step 201, original material scanning and material basic information extraction: the data processing equipment (1) calls a material scanning module to respectively scan the original film materials stored in each original material storage disc (2), and extracts material basic information of each original film material;
the basic information of the material comprises a volume number, a field number, a lens number, time code information, a frame rate and resolution;
the basic material information in step 201 further includes camera metadata; the camera metadata comprises shooting parameters and picture technical indexes of all pictures recorded by a camera end;
step 202, generating an original material index file: the data processing equipment (1) calls an index file generation module to synchronously store the material basic information of each original movie material extracted in the step 201 to obtain an original material index file;
the original material index file stores material basic information of all original movie materials in the mixed material to be processed;
step three, loading a clip decision list file: the data processing equipment (1) calls a file loading module to load a clip decision table file;
the editing decision table file is an editing decision table file generated when the transcoding file after the mixed material video to be processed is transcoded is edited;
fourthly, positioning and screening the effective material segments of the original material: the data processing equipment (1) calls a positioning and screening module, and respectively positions and screens the effective material segments of all the original movie materials in the to-be-processed mixed material according to the editing decision table file loaded in the step three and the original material index file in the step 202 to obtain the effective material segments of all the original movie materials;
the effective material segment positioning and screening process of the original material in the fourth step is a material bottoming process, index files of original film material files required by each cut and camera metadata are found by bottoming, the original film material files of different camera types are positioned by combining shooting storage directory structures recorded in the original material index files and camera file naming specifications through shooting material metadata information contained in the camera metadata, and the screening process of the original film material is completed;
connecting and storing a target material storage disk: and after the target material storage disk (3) is connected with the data processing equipment (1) through the data interface, the data processing equipment (1) calls a data storage module to copy and store all the effective material segments of the original movie material obtained in the fourth step into the target material storage disk (3).
2. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 1, characterized in that: in the third step, a decision table for clipping the transcoding file is stored in the clipping decision table file; the editing decision table file is an EDL file or an XML file.
3. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 2, characterized in that: the clip decision table file is a clip decision table file output by FinalCut, Premiere or Avid video clip software.
4. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 1 or 2, characterized in that: in the third step, a decision table for clipping the transcoding file is stored in the clipping decision table file;
the decision table comprises material information of the clipped material and clipping processing information when the clipped material is clipped; the material information of the edited material comprises the volume number of the material; the clipping processing information includes clipping point information when clipping is performed on the clipped material, the clipping point information including time code information of an in point and an out point;
in the fourth step, when the effective material segments of the original movie materials in the mixed material to be processed are respectively positioned and screened, the data processing device (1) calls a positioning and screening module to respectively match the material information and the clipping processing information in the clipping decision table file with the material basic information of the original movie materials in the original material index file in the step 202, so as to obtain the effective material segments of the original movie materials.
5. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 4, characterized in that: when the effective material segments of all the original film materials are respectively positioned and screened in the fourth step, the positioning and screening methods of the effective material segments of all the original film materials are the same;
when the effective material segments of any one of the original movie materials are positioned and screened, the process is as follows:
step 401, determining original movie materials: finding out the original movie material from the mixed material to be processed according to the material information in the clip decision table file loaded in the third step and by combining the original material index file in the step 202;
step 402, positioning and screening: determining time code information of an in-point and an out-point when the original movie material is clipped according to the clipping processing information loaded in the clipping decision table file in the third step; and respectively setting the in point and the out point when the original movie material is edited according to the determined time code information of the in point and the out point to obtain the effective material segments of the original movie material.
6. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 5, characterized in that: the basic information of the material in the first step also comprises a video type, wherein the video type is a sequence frame or a non-sequence frame;
when any one of the original movie materials is scanned in step 201, the video information of the original movie material is scanned one by one according to the sequence of the storage positions, and the video type of the original movie material is judged according to the scanning result;
when any effective material segment of the original film material is positioned and screened, the positioning and screening are performed according to the video type of the original film material judged in step 201: when the video type of the original movie material is judged to be a sequence frame in the step 201, positioning and screening are carried out according to the method in the step 402; when the video type of the original movie material is determined to be a non-sequential frame in step 201, the original movie material is used as an active material segment.
7. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 5, characterized in that: the clipping processing information in the third step further comprises special effect processing information when clipping is carried out on the clipped material, wherein the special effect processing information is hard cutting, overlapped drawing or variable speed; before determining the time code information of the in-point and the out-point when the original movie material is edited in step 402, the data processing device (1) also needs to call an editing decision table analysis module to identify the special effect processing information, and then determines the time code information of the in-point and the out-point when the original movie material is edited according to the identification result.
8. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 7, characterized in that: when the time code information of the in-point and the out-point of the original movie material is determined according to the identification result, when the editing decision table analysis module identifies that the special effect processing information is hard switching, the time code information of the in-point and the out-point of the original movie material is determined according to the editing point information in the editing decision table file of the original movie material and by combining the frame rate of the original movie material extracted in the step 202 and the frame number of the editing point of the original movie material when the original movie material is edited; when the editing decision table analysis module identifies that the special effect processing information is the superimposed picture, determining time code information of an in-point and an out-point when the original movie material is edited by adopting the editing tangent point information in the editing decision table file of the original movie material and combining a method that the length of the superimposed picture is added to the original movie material except the in-point and the out-point of the editing; when the editing decision table analysis module identifies that the special effect processing information is variable speed, the length of the original film material used for editing is calculated according to the editing tangent point information in the editing decision table file of the original film material and the material variable speed, and then the time code information of the in-point and the out-point of the original film material during editing is determined according to the calculated length of the original film material used for editing.
9. A method of background processing of mixed material for post-production of digital cinema as claimed in claim 1 or 2, characterized in that: the mixed material to be processed in the first step is an original mixed material of the manufactured digital film;
after the connection and storage of a target material storage disk are completed in the step five, the target material of the manufactured digital film is obtained, wherein the target material comprises effective material segments of all original film materials in the to-be-processed mixed material;
and fifthly, after the target material storage disk is connected and stored, the data processing equipment (1) needs to calculate the shooting slice ratio, the average lens length and the average shooting number of the lenses of the manufactured digital film.
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