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Does TI H.264 encoder B frame support multi-slice?

James Chu
Intellectual 480 points

Hi everyone,

Does TI H.264 Encoder support B frame with IH264_SLICEMODE_BYTES?

Thanks.

Sincerely,

James

  • 0
    TI__Prodigy 390 points

    Yes, it is supported. Please see below note in user-guide to know about the conditions under which it is supported.

    Note:
    sliceMode == IH264_SLICEMODE_BYTES is only supported under below conditions:
    Width >= 320 pixels
    inputContentType != IVIDEO_INTERLACED
    entropyCodingMode != IH264_ENTROPYCODING_CABAC
    streamFormat == IH264_NALU_STREAM is only supported when outputDataMode == IVIDEO_SLICEMODE with sub frame level communications

  • 0 in reply to Ramakrishna Adireddy
    Intellectual 480 points

    Dear Ramakrishna,

        But I try the use case in RDK.  If I set B frame, (that is interFrameInterval = 3) and

    set sliceCodingParams as below:

        dynamicParams->sliceCodingParams.sliceCodingPreset = 1;
        dynamicParams->sliceCodingParams.sliceMode = 2;
        dynamicParams->sliceCodingParams.sliceUnitSize = 1000;

    the encoder control will fail.  Error message is as below.

    !ERROR!:ENCLINK::links_m3video/iva_enc/encLink_h264.c:[178]::INTERNAL ERROR:-1
     [m3video] ALGCONTROL FAILED:CMD:1

    If I set

        dynamicParams->sliceCodingParams.sliceCodingPreset = 1;
        dynamicParams->sliceCodingParams.sliceMode = 1;
        dynamicParams->sliceCodingParams.sliceUnitSize = 44;

    The encoder control succeed and generate correct bitstream.

    Is there anything wrong?  Could you give me some advices? Thanks.

    Sincerely,

    James

  • 0 in reply to James Chu
    TI__Prodigy 390 points

    Dear James Chu,

    My mistake, for this particular mode (i.e., IH264_SLICEMODE_BYTES) B-frame encoding is not supported. It is not documented it in user-guide. We will update this info in user guide. The interFrameInterval should not be greater than 1 for sliceMode = IH264_SLICEMODE_BYTES

    Please click on verify if this answers your query

    -Ramakrishna.