Granted Patent B2

US 12,647,561 · App. 18/501,905 · Granted Jun 2, 2026

Inventors: Ivan Vladimirovich Naletov (Tomsk, RU); Sergey Zurpal (Seversk, RU)

Assignee: DIVX, LLC

H04N19/12H04N19/139H04N19/14H04N19/157H04N19/177H04N19/40

Abstract

Claims (40)

1 . A method for transcoding video data into a set of multiple alternate video streams, the method comprising:

receiving a portion of encoded video, that includes a first plurality of encoded images in a first resolution, at a transcoding device including a plurality of encoders;

decoding, at the transcoding device, the portion of encoded video in the first resolution to generate a decoded portion of video including a plurality of decoded images;

receiving media metadata for the portion of encoded video at the transcoding device over a communications network from a media metadata source, wherein the media metadata source is a system external to the transcoding device and is configured to communicate with the transcoding device over the communications network, wherein the media metadata is pre-generated by the media metadata source before the transcoding device receives the portion of encoded video and comprises:

at least one type of data from a group consisting of motion data, picture complexity information, a number of frames between two scene changes, a set of motion vectors, and a set of intra-prediction modes for use in encoding the decoded portion of video; and

encoding, at each of the plurality of encoders, the plurality of decoded images of the decoded portion of video into a second plurality of encoded images at a different resolution based upon the media metadata.

2 . The method of claim 1 , wherein the set of transcoding parameters within the media metadata include at least one of a number of B-frames between two P-frames, and a scene change detection signal.

3 . The method of claim 2 , further comprising determining a number of bits based at least in part on the number of B-frames between two P-frames.

4 . The method of claim 3 , further comprising determining the number of bits based at least in part on the scene detection signal indicated by the media metadata.

5 . The method of claim 1 , wherein encoding the plurality of decoded images into the second plurality of encoded images is performed by, for each decoded image in the plurality of decoded images:

generating a prediction image for each of a plurality of coding units of the particular decoded image using at least one of the motion data, the set of motion vectors, or a set of intra-prediction modes within the media metadata according to the second format;

performing transforms on residual images of the plurality of coding units to generate sets of transform coefficients based on the second format; and

performing entropy encoding on the sets of transform coefficients to generate images for the second plurality of encoded images.

6 . The method of claim 5 , wherein encoding the plurality of decoded images into the second plurality of encoded images is further performed by, for each decoded image in the plurality of decoded images, performing quantization on the sets of transform coefficients by:

determining a number of bits to encode a group of pictures (GOP) based at least in part on at least one of the picture complexity information or the number of frames between two scene changes;

determining a quantization parameter based on the number of bits; and

quantizing the sets of transform coefficients according to the second format using the quantization parameter.

7 . The method of claim 1 , wherein the first resolution is different from the resolutions of each of the pluralities of encoded images generated by the plurality of encoders.

8 . The method of claim 1 further comprising dividing each particular decoded image in the plurality of decoded images into a plurality of coding units based on the second format.

9 . A transcoding system comprising:

a plurality of processors; and

a non-volatile storage containing an application for causing the plurality of processors to perform the steps of:

receiving a portion of encoded video, that includes a first plurality of encoded images in a first resolution;

decoding the portion of encoded video in the first resolution to generate a decoded portion of video including a plurality of decoded images;

receiving media metadata for the portion of encoded video over a communications network from a media metadata source, wherein the media metadata source is a system external to the transcoding system and is configured to communicate with the transcoding system over the communications network, wherein the media metadata is pre-generated by the media metadata source before the transcoding system receives the portion of encoded video and comprises:

at least one type of data from a group consisting of motion data, picture complexity information, a number of frames between two scene changes, a set of motion vectors, and a set of intra-prediction modes for use in encoding the decoded portion of video; and

encoding the plurality of decoded images of the decoded portion of video into a second plurality of encoded images at a different resolution based upon the media metadata.

10 . The transcoding system of claim 9 , wherein the set of transcoding parameters within the media metadata include at least one of a number of B-frames between two P-frames, and a scene change detection signal.

11 . The transcoding system of claim 10 , further comprising determining a number of bits based at least in part on the number of B-frames between two P-frames.

12 . The transcoding system of claim 11 , further comprising determining the number of bits based at least in part on the scene detection signal indicated by the media metadata.

13 . The transcoding system of claim 9 , wherein encoding the plurality of decoded images into the second plurality of encoded images is performed by, for each decoded image in the plurality of decoded images:

generating a prediction image for each of a plurality of coding units of the particular decoded image using at least one of the motion data, the set of motion vectors, or a set of intra-prediction modes within the media metadata according to the second format;

performing transforms on residual images of the plurality of coding units to generate sets of transform coefficients based on the second format; and

performing entropy encoding on the sets of transform coefficients to generate images for the second plurality of encoded images.

14 . The transcoding system of claim 13 , wherein encoding the plurality of decoded images into the second plurality of encoded images is further performed by, for each decoded image in the plurality of decoded images, performing quantization on the sets of transform coefficients by:

determining a number of bits to encode a group of pictures (GOP) based at least in part on at least one of the picture complexity information or the number of frames between two scene changes;

determining a quantization parameter based on the number of bits; and

quantizing the sets of transform coefficients according to the second format using the quantization parameter.

15 . The transcoding system of claim 9 , wherein the first format and the second format have different resolutions.

16 . The transcoding system of claim 9 further comprising dividing each particular decoded image in the plurality of decoded images into a plurality of coding units based on the second format.

Assignments (3)

Continuity (5)

References Cited (400)