EP2853095A1 - Procédé et système de traitement pour générer au moins deux flux vidéo compresses - Google Patents
Procédé et système de traitement pour générer au moins deux flux vidéo compressesInfo
- Publication number
- EP2853095A1 EP2853095A1 EP13727300.9A EP13727300A EP2853095A1 EP 2853095 A1 EP2853095 A1 EP 2853095A1 EP 13727300 A EP13727300 A EP 13727300A EP 2853095 A1 EP2853095 A1 EP 2853095A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- video stream
- metric
- met
- video
- processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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Definitions
- the object of the present invention lies in the field of coding and decoding of digital video, and more specifically in the field of compression / decompression of a digital video stream.
- the object of the present invention relates to a specific data processing for generating independently several compressed video streams from the same video source.
- the object of the present invention thus finds a particularly advantageous application for multi-stream video encoders by enabling the distribution of multimedia content via the Internet or mobile networks based on adaptive bit rate techniques such as for example HLS techniques (for HTTP Live Streaming "),” SmoothStreaming ", or MPEG DASH (for” Dynamic Adaptive Streaming over http ").
- HLS techniques for HTTP Live Streaming "
- SmoothStreaming for SmoothStreaming
- MPEG DASH for Dynamic Adaptive Streaming over http "
- the receiver chooses the rate at which it wishes to receive the content.
- the desired content is compressed simultaneously and independently at different bit rates.
- the receiver which is aware of available compressed streams, continuously measures the transmission rate available on the link, and requires the content server the version whose rate is most suitable for the link.
- each section contains a compressed video stream using the H.264 / AVC standard and a compressed audio stream using the MPEG standard
- This method is substantially analogous to the HLS method described above, except that it is based on encapsulation of the sections into type files.
- Such a difference has the advantage of allowing the transmission of auxiliary data such as subtitles, and of allowing in a simple way the direct access within the sections (called here "seeks").
- the main variations are: the compressed rate, the dimensions of the compressed images, the number of frames per second (in English "frame-rate”) or the profile of the standard used.
- the output streams are cut into sections. However, for the receiver to switch from one stream to another, it is necessary that these sections are aligned; that is, the same source image is encoded at the beginning of each section.
- One of the objectives of the present invention is to improve the situation described above.
- the object of the present invention relates to a method of processing a video stream for generating at least two compressed video streams.
- the processing method includes an analysis step in which at least one image of the video stream is analyzed to determine at least one metric of the video stream.
- metric of a video stream in the sense of the present invention, here is meant a datum containing at least one physical information allowing a spatial or space-time characterization of an image or a sequence of images of the video stream.
- metrics determined during this step we find in particular the average brightness, the indication of a change of scene, the variance, the complexity, the local and / or global activity, a pre-grid of weighting information. blocks of images and / or a set of motion vectors.
- the processing method provides an encoding step during which, following a transformation of the type for example a spatial and / or temporal decimation, a change of color space and / or a deinterlacing operation of the video stream, the transformed video stream is encoded according to said at least one metric so as to obtain at least two compressed video streams.
- a transformation of the type for example a spatial and / or temporal decimation, a change of color space and / or a deinterlacing operation of the video stream.
- the processing method described above makes it possible to generate from the same source several compressed video streams that are independent of each other.
- each of the output video streams is independently decodable, and these streams may share common features such as sync points.
- the processing method according to the present invention comprises a first determination step during which is determined, according to said at least one metric, an encoding structure of the video stream.
- Determining the most appropriate encoding structure from a metric of the video stream enables the synchronization of sections of the stream.
- MPEG type predictive encoders it can be the type of image: I, P or B. It is understood here that it can also be a much finer encoding structure like the encoding mode of each block of the image.
- the processing method according to the present invention comprises a second determination step during which is determined, according to said at least one metric, an adaptive quantization of the video stream.
- This quantization notably makes it possible to control the lossy compression part and the output rate of the compressed video stream for the network.
- This may for example consist of a quantization grid according to which it can be provided that all the pixels of a block must be decimated spatially and / or temporally as a function of a quantization step.
- the processing method according to the present invention comprises a processing step which consists in particular in a scaling of the video stream and / or said at least one metric.
- Such scaling allows in particular that said at least one metric is in correspondence with the video stream to be encoded.
- the scaling is performed in such a way that it allows a change in spatio-temporal resolution and / or a change in the image rate.
- the treatment method according to the present invention comprises a refinement step during which said at least one metric is refined on at least one image of the digital stream.
- the object of the present invention relates to a computer program which includes instructions adapted for the execution of the steps of the method of provisioning as described above, this in particular when said computer program is executed. by a computer.
- Such a computer program can use any programming language, and be in the form of a source code, an object code, or an intermediate code between a source code and an object code, such as in a partially compiled form, or in any other desirable form.
- the subject of the present invention relates to a computer-readable recording medium on which is recorded a computer program comprising instructions for executing the steps of the delivery method as described hereinabove. above.
- the recording medium can be any entity or device capable of storing the program.
- the medium may comprise storage means, such as a ROM, for example a CD-ROM or a microelectronic circuit type ROM, or a means magnetic recording, for example a "floppy disk” type diskette or a hard disk.
- this recording medium can also be a transmitted medium such as an electrical or optical signal, such a signal can be conveyed via an electrical or optical cable, conventional radio or radio or self-directed laser beam or by other means.
- the computer program according to the invention can in particular be downloaded to an Internet type network.
- the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to execute or to be used in the execution of the method in question.
- the subject of the present invention also relates to a computer processing device comprising computer means configured to implement the steps of the method described above.
- the computing processing device comprises an analysis means which is configured to analyze at least one image of the video stream to determine at least one metric of said video stream.
- the computing processing device further comprises at least a first and a second encoding means configured to encode, according to said at least one metric, said video stream previously transformed during a transformation of the type by example a spatial and / or temporal decimation, a change of color space and / or a deinterlacing operation of the video stream.
- the first and second encoding means thus make it possible to obtain, according to said at least one metric, said at least two compressed video streams.
- the computing processing device comprises at least a first determination means which is configured to determine, according to said at least one metric, an encoding structure of the video stream.
- the computing processing device comprises at least a second determination means which is configured to determine, based on said at least one metric, adaptive quantization of the video stream.
- the computing processing device comprises at least one processing means configured to allow scaling of the video stream and / or said at least one metric.
- said at least one processing means is configured to allow a change in the space-time resolution of the video stream and / or a change in the image rate.
- said at least one processing means is further configured to refine said at least one metric on at least one image of the video stream.
- the object of the present invention by its various functional and structural aspects, allows multi-stream generation particularly advantageous for the distribution of multimedia content via the Internet or mobile networks based on adaptive bit rate techniques.
- FIGS. 1 to 2 illustrate an exemplary embodiment thereof which is devoid of any limiting character and on which:
- FIGS. 1a and 1b each schematically represent a computing processing device according to an advantageous embodiment of the present invention.
- FIG. 2 represents a flowchart illustrating the treatment method according to an advantageous exemplary embodiment.
- a video encoder processes a video source and produces a compressed stream of this source: to allow the design a multi-stream video encoder from the same video source is one of the objectives of the present invention.
- the object of the present invention relates to a computer processing device 100 which is configured to implement a processing method as illustrated in FIG.
- the computing device 100 allows the processing of an input video stream IN such that a plurality of at least two video streams OUTN are generated (N being a positive integer between 2 to N).
- N compressed video streams OUT1, OUT2, OUT3, OUTN are generated at the output (where N is a positive integer greater than or equal to 4).
- the device 100 comprises a main video encoder 10 which comprises an analysis means M 1 capable of analyzing the input video stream IN once during a prior analysis step S1.
- This means M1 thus makes it possible to determine, once and for all, at least one metric MET such as, for example, the average brightness, an indication of a change of scene, the variance, the complexity, the local and / or global activity, a pre-grid of information for weighting the image blocks and / or a set of motion vectors.
- at least one metric MET such as, for example, the average brightness, an indication of a change of scene, the variance, the complexity, the local and / or global activity, a pre-grid of information for weighting the image blocks and / or a set of motion vectors.
- This analysis can be relatively complex, and in some cases, may even consist of completely encoding the images.
- the present invention typically consists in using the measurements of these MET metrics obtained during this analysis step S1 to simplify the operations to be performed in the encoding phase.
- the analysis phase includes a motion estimation
- the vectors determined during this analysis can be used as starting points for a simple refinement during encoding.
- the inventive concept underlying the present invention therefore consists in using the fact that the measurements made during the analysis phase are used subsequently during the encoding phase, with possibly relatively simple modifications for all the versions encoded from the same source.
- MET metrics are obtained only from structural data images provided source, they do not depend on the encoding process itself. Because of this, the variations required during the multi-stream encoding can be performed on MET metrics without having to recalculate them completely.
- the images to be compressed are therefore analyzed once in the main video encoder 10.
- the main video encoder 10 comprises a first determination means M2 which, in a first determination step S2, determines as a function of the MET metric of the stream. the video or encoding structures ideal for each of the streams OUT1, OUT2, OUT3, and OUTN.
- the computing device 100 further comprises second determining means M3_1, M3_2, M3_3, M3_N which are configured to determine, according to the said at least one metric MET, an adaptive quantization of the video stream IN, this during a second determination step S3.
- second determining means M3_1, M3_2, M3_3, M3_N which are configured to determine, according to the said at least one metric MET, an adaptive quantization of the video stream IN, this during a second determination step S3.
- this quantization makes it possible to control the lossy compression portion and the output rate of the compressed video stream for the network.
- the MET metrics thus follow the same path as that of the source images I and are applied methods for compensating for the variations applied to the source images.
- each secondary encoder 20, 30 and N comprises processing means M4_2 and M4_2 ', M4_3 and M4_3', and M4_N and M4_N 'which are configured to scale the flow IN video and / or said at least one metric MET, this during a processing step S4.
- processing means M4_2 and M4_2 ', M4_3 and M4_3', and M4_N and M4_N ' which are configured to scale the flow IN video and / or said at least one metric MET, this during a processing step S4.
- Such scaling allows the MET metric (s) to match the IN video stream to be encoded.
- a direct transformation that is to say without using the image, sometimes gives no satisfactory results. This is the case for example of the motion vector set or the "Quadtree" decomposition used in the HEVC encoders.
- the processing means M4_2 and M4_2 ', M4_3 and M4_3 ⁇ and M4_N and M4_N' are configured to refine the at least one metric MET on at least one image I of the video stream IN, during a refinement step S5.
- This operation is generally very inexpensive in terms of calculations because a very good starting point can be obtained from the initial metrics.
- the I images and MET metrics are scaled from already scaled variations. This is the most efficient method in terms of calculations made, but it should be noted that it requires to be usable in practice to order the variations. For example, starting from a frame rate of 25 frames / s, variations at 12.5 frames / sec and 6.25 frames / sec impose the temporal decimation order: 6.25 frames / sec is obtained from 12.5 images / s, the opposite is impossible.
- the encoders that is to say the main encoder 10 and the secondary encoders 20, 30, N, each comprise an encoding means M5_1, M5_2, M5_3, M5_N configured to encode the video stream IN respectively. function of the various input parameters to obtain compressed video streams OUT1, OUT2, OUT3, OUTN independent of each other.
- the image analysis I is performed on the main stream, and the coding structure determination can be communalised for all streams. It is thus possible to synchronize the sections, for example on the scene changes that are common to all the streams.
- each output stream is a version decimated spatially (reduction in size of the images) and / or temporally (reduction of the number of images per second) of the same video source, this according in particular to the or MET metrics determined in a single analysis.
- This succession of technical steps is managed by a computer program PG which includes instructions adapted to perform the steps of the method described above and which is contained on a recording medium CI.
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- Computer Networks & Wireless Communication (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1254567A FR2990814B1 (fr) | 2012-05-18 | 2012-05-18 | Procede et systeme de traitement pour generer au moins deux flux video compresses |
PCT/FR2013/051072 WO2013171433A1 (fr) | 2012-05-18 | 2013-05-16 | Procédé et système de traitement pour générer au moins deux flux vidéo compresses |
Publications (1)
Publication Number | Publication Date |
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EP2853095A1 true EP2853095A1 (fr) | 2015-04-01 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP13727300.9A Ceased EP2853095A1 (fr) | 2012-05-18 | 2013-05-16 | Procédé et système de traitement pour générer au moins deux flux vidéo compresses |
Country Status (4)
Country | Link |
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US (1) | US20150163490A1 (fr) |
EP (1) | EP2853095A1 (fr) |
FR (1) | FR2990814B1 (fr) |
WO (1) | WO2013171433A1 (fr) |
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JP4797974B2 (ja) * | 2006-12-25 | 2011-10-19 | 株式会社日立製作所 | 撮像装置 |
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FR2925795B1 (fr) * | 2007-12-20 | 2010-01-15 | Ateme Sa | Procede et dispositif de codage d'une sequence temporelle d'images video, sous contrainte de debit |
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2012
- 2012-05-18 FR FR1254567A patent/FR2990814B1/fr not_active Expired - Fee Related
-
2013
- 2013-05-16 WO PCT/FR2013/051072 patent/WO2013171433A1/fr active Application Filing
- 2013-05-16 EP EP13727300.9A patent/EP2853095A1/fr not_active Ceased
- 2013-05-16 US US14/401,985 patent/US20150163490A1/en not_active Abandoned
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2013171433A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2990814B1 (fr) | 2014-05-16 |
WO2013171433A1 (fr) | 2013-11-21 |
US20150163490A1 (en) | 2015-06-11 |
FR2990814A1 (fr) | 2013-11-22 |
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