CN1812550A - Video frequency source material synthesizing method - Google Patents

Abstract

The invention relates to a video material synthesis method, belonging to the technical field of radio and television broadcast control systems. In the prior art, the TV station uses a video recorder to realize the synthesis of multiple video materials. When synthesizing the materials, it is necessary to locate the in-point and the out-point of the synthesized material first, and then preview and generate the combined material. However, the video recorder is a linear playback device. It is troublesome to point and point out, and time-consuming to synthesize; it is also very difficult to modify; it is easy to damage the tape. Although the video server is easy to locate the material, it has no material synthesis function. The method of the present invention uses the control characteristics of the video server to record the in-point and out-point of material positioning and map it into a logical mapping table to achieve the effect of logical synthesis; if it needs to be modified, it only needs to modify the in-point of the logical mapping table and point information. By adopting the method of the invention, the material synthesis efficiency is greatly improved, the modification is convenient, and the video content and sound are not damaged in any way; additional storage media and equipment are not required.

Description

A method for synthesizing video material

technical field

The invention belongs to the technical field of radio and television broadcast control systems, and in particular relates to a method for synthesizing video materials.

Background technique

In the radio and television system, the various TV programs that the audience sees are the effects of processing and synthesizing various materials. Obviously, the production of materials is the premise of broadcasting, and it is also a very important link. In the process of material production, a lot of work is the synthesis of materials, that is, the different contents of multiple different materials are synthesized into one material for broadcasting. In the prior art, TV stations usually use video recorders to synthesize multiple materials. When synthesizing materials, the staff first locates the in-point and out-point of the material to be synthesized, and previews the effect of the synthesized material. If there is no problem with the preview, then generate Composite material. However, since the video recorder is a linear playback device, it is troublesome to locate the in-point and out-point of the material, and the synthesis is time-consuming; if other personnel review the synthesized material and find that it is unqualified, they need to re-synthesize the material, which is inefficient; at the same time, Multiple plays of the tape can also easily damage the tape. However, in the broadcast television system, the video server is a non-linear playback device. It is easy to locate the material, has high playback control efficiency, and has no damage to the video content and sound of the material. However, it has no material synthesis function and cannot be previewed before it is actually generated. In addition, when the materials are located on different video servers, how to quickly synthesize them is a difficult problem.

Contents of the invention

In view of the problems and defects in the prior art, the purpose of the present invention is to provide a method for video material synthesis, which can utilize the hard disk nonlinear storage characteristics and control characteristics of the video server, combined with the video file system storage characteristics and video file compression The coding algorithm uses the unique identifier to quickly query the element material, and uses the method of key frame search and positioning to quickly record the in-point and out-point of the element material location and map it into a logical mapping table. At the same time, it generates a device attribute control table and special effect auxiliary table. The center generates virtual material, and uses the high-precision preview center to preview the material to achieve the effect of logical synthesis; if the synthesized logical material fails to pass the inspection and is re-made, only the in-point and out-point information of the logic table needs to be modified.

In order to achieve the above object, the technical solution adopted in the present invention is: a method for video material synthesis, comprising the following steps:

(1) locate the video material entry and exit point information that needs to be synthesized from the video material library of the video server;

Further, the specific method of the above positioning is as follows:

1) First, according to the non-linear storage characteristics of the hard disk and the characteristics of the video file system, use the unique identifier of the file to quickly query and locate each element material to be edited;

2) Then according to the video file compression encoding algorithm, extract encoding features and key frame information, etc., generate a key frame index table, use the key frame index to quickly locate the entry point and exit point of the element material, and record the information;

(2) Record the in-point and out-point information of the positioning in the logical mapping table to form a logical mapping;

Further, this step also includes the following operations: extract the device attributes of the device where each element material is located, index and store according to the unique identifier of the element material, and generate a device attribute control table for precise control in the later stage; according to the editing requirements and the above-mentioned element material Key frame index table, set the transition effects between each element material, and generate special effect auxiliary table;

(3) Preview the synthesized material according to the material information recorded in the logical mapping table;

Further, this step is realized as follows: first, according to the logical mapping table, equipment attribute control table and special effect auxiliary table generated in step (2), in the logic control center, each element material video segment and element material required The properties of the equipment and the special effect assistants are arranged in order according to the editing requirements, and a virtual material is generated; then, the high-precision preview center is used to preview after virtual synthesis according to the information of the virtual material and the control characteristics of the video server, and check the effect of the synthesized material;

Furthermore, the materials played in step (3) are seamlessly connected and sequentially played out according to the material information recorded in the logical mapping table, and the material playback is accurate to the frame.

(4) If the synthesized material needs to be modified, modify the in-point and out-point information of the material in the preview, and update the logical mapping table and special effect auxiliary table at the same time;

(5) Repeat the previous steps until the synthesis of the video material is completed.

Further, after the video material is synthesized, the corresponding content is recorded to the storage medium according to the logical mapping table. The storage medium is hard disk or magnetic tape.

The effect of the present invention is: adopting the method described in the present invention greatly improves the video material synthesis efficiency, is convenient to modify, and does not have any damage to the content and sound of the video material; the synthesis effect is controlled by the video server to the logical entry and exit points , no additional storage media and devices are required.

Description of drawings

Figure 1 is a flow chart of the method of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

As shown in Figure 1, a method for video material synthesis comprises the following steps:

(1) locate the video material entry and exit point information that needs to be synthesized from the video material library of the video server;

Specifically, the present embodiment is realized as follows:

1) First, according to the non-linear storage characteristics of the hard disk and the characteristics of the video file system, use the unique identifier of the file to quickly query and locate each element material to be edited;

2) Then according to the video file compression encoding algorithm, extract encoding features and key frame information, etc., generate a key frame index table, use the key frame index to quickly locate the entry point and exit point of the element material, and record the information;

(2) Record the in-point and out-point information of the positioning in the logical mapping table to form a logical mapping;

In this embodiment, when forming the logical mapping, the device attributes of the device where each element material is located are also extracted, indexed and stored according to the unique identifier of the element material, and a device attribute control table is generated for later precise control; then according to the editing requirements and the above The element material key frame index table, set the transition effect between each element material, and generate the special effect auxiliary table;

(3) Preview the synthesized material according to the material information recorded in the logical mapping table;

Specifically, in this embodiment, according to the logical mapping table, device attribute control table, and special effect auxiliary table generated above, in the logic control center, the required element material video clips, the device attributes where the element material is located, and the special effect auxiliary table are arranged according to Arrange the order of editing requirements to generate a virtual material; use the high-precision preview center to preview after virtual synthesis according to the information of the virtual material and the control characteristics of the video server, and check the effect of the synthesized material;

The materials played in step (3) are seamlessly connected and sequentially played out according to the material information recorded in the logical mapping table, and the material playback is accurate to the frame.

(4) If the synthesized material needs to be modified, modify the in-point and out-point information of the material in the preview, and update the logical mapping table and special effect auxiliary table at the same time;

To modify the synthesized material, you only need to directly modify the in-point and out-point information of the material, and then modify the in-point and out-point information according to the effect of the actual synthesized material after generating the actual synthesized material; direct modification means that the material synthesis does not conform to the synthesis When required, the in-point and out-point of the material associated with the mapping can be corrected, and then previewed again. In this process, there is no need for actual synthesis; the actual synthesis refers to typing each segment through the in-point and out-point The material is actually recorded on the storage medium and becomes a piece of material.

(5) Repeat the previous steps until the synthesis of the video material is completed.

(6) After the video material is synthesized, record the corresponding content to the storage medium according to the logical mapping table. The storage medium is a hard disk or magnetic tape, or other storage medium.

Take the completion of a material synthesis task as an example below to illustrate the method of utilizing the method of the present invention to realize video material synthesis. The specific implementation method is as follows:

Assuming that there are two elements to be synthesized,

The logo is 100001, the title is: Olympic mascot display, the duration starts at frame 00:00:00:00, 00:00:29:24, which is 30 seconds of material;

The ID is 200001, the title is: Olympic Beijing Scenery, the duration starts at frame 00:00:00:00, 00:00:59:24, which is 60 seconds of material;

10001 needs to be from frame 00:00:10:00 to frame 00:00:20:24, frame 200001 is from frame 00:00:15:00 to frame 00:00:50:00, synthesized into one material, and the middle transition is fade-in Fade out, the elements are stored separately with two servers.

1) Using the characteristics of the file system, quickly locate the element material 100001 and 200001;

2) Extract the encoding features and key frame information of the element material 100001 and 200001, generate a key frame index table, quickly locate the in-point and out-point of the element material, and record the information; namely: the 00:00:10:00 frame of 10001 and 00:00:20:24 frame, 00:00:15:00 frame and 00:00:50:00 frame of 200001

3) Record the 00:00:10:00 frame and 00:00:20:24 frame of 10001, the 00:00:15:00 frame and 00:00:50:00 frame of 200001 into the logical mapping table to form logical mapping;

4) Extract the device attributes of the devices where 10001 and 200001 are located, index and store according to the unique identifiers 10001 and 200001 of the element material, and generate a device attribute control table for later precise control;

5) According to the editing requirements and the element material key frame index table, set the transition effect between 10001 and 200001 to fade in and fade out, and generate a special effect auxiliary table;

6) According to the above information, put the required 00:00:10:00 frame and 00:00:20:24 frame of 10001, and the 00:00:15:00 frame and 00:00 frame of 200001 in the logic control center: The video clips at frame 50:00, the device properties of the element materials and the special effects are arranged in order according to the editing requirements to generate a virtual material;

7) Utilize the high-precision preview center to preview after the virtual synthesis according to the information of the virtual material and the control characteristics of the video server, and check the effect of the synthesized material;

8) If the synthesized material meets the requirements, complete the synthesis; otherwise, if it needs to be modified, re-modify the in-point and out-point information of material 100001 and 200001 in the preview, and update the logical mapping table and special effect auxiliary table at the same time, repeat the previous step;

9) After the video material is synthesized, according to the requirements of whether to generate actual material, it can be generated and recorded into the storage medium, or not generated, and only the virtual material is reserved for use; when recording the material, record the corresponding content to the storage medium according to the logical mapping table middle. The storage medium is a hard disk or magnetic tape, or other storage medium.

The method described in the present invention is not limited to the examples described in the specific implementation manners, and those skilled in the art can obtain other implementation manners according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.

Claims (8)

1. the synthetic method of a video material may further comprise the steps:

(1) location needs synthetic video material in and out point information from the video material storehouse of video server;

(2) with the in and out point information recording/of location in the logical mappings table, form logical mappings;

(3) material synthetic according to the material information preview that records in the logical mappings table;

(4) need to revise such as synthetic material, then in preview, revise the in and out point information of material, upgrade simultaneously logical mappings table and special efficacy supplementary table;

(5) step of repetition front is up to finishing the synthetic of video material.

2. the method that a kind of video material as claimed in claim 1 is synthetic is characterized in that: the video material that location needs synthesize in the step (1) is gone into a little and when going out dot information,

1) at first according to hard disk Nonlincar memory characteristic and videotex system characteristic, utilizes the file unique identification, each yuan material that classification quick search location will be edited;

2) then according to the video file Coding Compression Algorithm, extract coding characteristic and key frame information, generate the key frame concordance list, adopt the in and out point of the quick location element material of key frame index, record this information.

3. the synthetic method of a kind of video material as claimed in claim 1 or 2, it is characterized in that: step also comprises following operation in (2), extract the device attribute of the equipment at each first material place, carry out index stores by first material unique identification, generate the device attribute control table, be used for the later stage accurately to control; According to edit request and above-mentioned first material key frame concordance list, the transition special efficacy between each first material is set, generate the special efficacy supplementary table.

4. the method that a kind of video material as claimed in claim 3 is synthetic, it is characterized in that step (3) realizes as follows: at first according to the logical mappings table, device attribute control table and the special efficacy supplementary table that generate in the step (2), in logic control, in the heart auxiliary the putting in order by edit request of needed each first material video clips, first material place device attribute and special efficacy arranged, generate a virtual material; Utilize high accuracy preview center to carry out virtual preview after synthetic according to the control characteristic of the information of this virtual material and video server then, the material effect is synthesized in check.

5. the method that a kind of video material as claimed in claim 4 is synthetic is characterized in that: the material of being play in the step (3) is according to the material information of logical mappings table record the seamless link of each section material, order to be broadcasted, and material is play and is accurate to frame.

6. the method that a kind of video material as claimed in claim 1 or 2 is synthetic is characterized in that this method is further comprising the steps of: after finishing video material synthetic, record corresponding content in storage medium according to the logical mappings table.

7. the method that a kind of video material as claimed in claim 6 is synthetic, it is characterized in that: described storage medium is hard disk or tape.

8. the synthetic method of a kind of video material as claimed in claim 5 is characterized in that: after finishing video material synthetic, record corresponding content in hard disk or tape according to the logical mappings table.