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DM814x Force First H.264 Frame using OMX

Danny Cullen
Intellectual 510 points

Hello all,

Could someone tell me if it is possible to force the generation of a 'first frame' of H.264 data (the frame containing the SPS/PPS data).

At arbitrary points in my encoding I want to regenerate the SPS/PPS data but I can't find any examples on how to do this.

In my application I ran a test to see if generating continuous I-frames would be sufficient but if I do not write the very first I-frame to my elementary stream file my H.264 parser and player cannot process the stream.

Regards,

Danny

  • 0
    TI__Guru* 80190 points
    Hello,

    You could check the H264 user guild.
    /component-sources/omx_05_02_00_48/src/ti/omx/docs

    Best Regards,
    Margarita
  • 0
    TI__Mastermind 30480 points
    Hi Danny,
    You can force the next frame to be encoded as IDR frame by setting "forceFrame" of VIDENC2_DynamicParams to IVIDEO_IDR_FRAME.
    you can try the following code to force IDR frame arbitrarily.

    OMX_VIDEO_CONFIG_DYNAMICPARAMS tDynParams;
    OMX_INIT_PARAM (&tDynParams);

    tDynParams.nPortIndex = OMX_VIDENC_OUTPUT_PORT;

    eError = OMX_GetConfig (pAppData->pEncHandle, OMX_TI_IndexParamVideoDynamicParams,
    &tDynParams);

    /* Force IDR frame */
    tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.forceFrame = IVIDEO_IDR_FRAME;

    eError = OMX_SetConfig (pAppData->pEncHandle, OMX_TI_IndexParamVideoDynamicParams,
    &tDynParams);

    Thanks
  • 0 in reply to Ramprasad
    Intellectual 510 points
    Hello Ramprasad,

    Thank you very much for the hint. I have been trying to solve this by generating I-frames dynamically but hadn't spotted the generation of IDR frames.

    I shall confirm the behaviour next week after I have implemented the changes to my application.

    Regards,

    Danny