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Systems, methods, and media for transcoding video data according to encoding parameters indicated by received metadata

  • US 9,906,785 B2
  • Filed: 03/15/2013
  • Issued: 02/27/2018
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A method for transcoding video data using a transcoding device, the method comprising:

  • receiving a portion of encoded video that includes a first plurality of encoded images encoded according to a first encoding scheme from a media content source using a transcoding device;

    decoding the portion of encoded video based on the first encoding scheme to generate a decoded portion of video including a plurality of decoded images using the transcoding device;

    receiving media metadata at the transcoding device over a communications network from a remote media metadata source, the media metadata being generated and stored on the remote media metadata source prior to decoding the portion of encoded video, wherein the media metadata comprises;

    a set of transcoding parameters that define a second encoding scheme, wherein the first encoding scheme and the second encoding scheme have different bit rates; and

    at least two types of data from the 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 according to a second encoding scheme using the transcoding device; and

    encoding the plurality of decoded images of the decoded portion of video into a second plurality of encoded images based on the second encoding scheme defined by the received media metadata using the transcoding device by performing at least the following operations for each particular 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 received media metadata according to the second encoding scheme;

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

    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 generated set of transform coefficients according to the second encoding scheme using the quantization parameter; and

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

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