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How to get SPS PPS and SEI frames in same buffer from encoder

Shabbir Limdiwala
Expert 2060 points


Hello all,


We are using DVRRDK_03.50.00.05 on DM816x series processor. Ours is a streaming/recording application where we use Ti's H264 encoder. We are calling Venc_getBitstreamBuffer function to read frames from encoder and we are getting frames in following sequence,

SPS 0x00 0x00 0x00 0x01 0x27 <Data>

PPS 0x00 0x00 0x00 0x01 0x28 <Data>

SEI 0x00 0x00 0x00 0x01 0x06 <Data>

I frame 0x00 0x00 0x00 0x01 0x25 <Data>

...

All three SPS, PPS and SEI frames are having same timestamp but they are coming in separate Venc_getBitstreamBuffer function calls.

My question :

Is it possible to have these SPS, PPS and SEI frames in same buffer (i.e. in one single Venc_getBitstreamBuffer function call) like this,

0x00 0x00 0x00 0x01 0x27 <Data> PPS 0x00 0x00 0x00 0x01 0x28 <Data> SEI 0x00 0x00 0x00 0x01 0x06 <Data>

I frame 0x00 0x00 0x00 0x01 0x25 <Data>

...

Thanks in advance..


  • 0
    Mastermind 6325 points

    Hello Shabbir,

     

    I wonder about this too.  I ended up doing it manually and overwriting the header that the encoder gave me with my own.

     

    Brandy

  • 0 in reply to Brandy Jabkiewicz
    TI__Guru 59700 points

    This is really weird.

    The way the encoder link is written such a behavior is impossible because for each frame only a single output buffer is passed in the encoder codec processCall which is then forwarded to ipcBitsLink.

    - Are the channel numbers the same when you get SPS/PPS/I_frame in separate process calls.

    - If channels numbers are same are the buffer addresses of SPS/PPS/I_Frame physically contiguous.

    - Are you doing interlaced encoding ?

    - Are you doing force I frame ?

    - Pls print the encoder static and dynamic parameters and share the logs.

     

  • 0 in reply to Badri Narayanan
    Expert 2060 points

    Thanks Badri, I double checked the points which you asked and I found that there was some issue in my application which was giving wrong observation. I am getting proper frame sequence SPS......PPS.......SEI.......I_FRAME..... etc.

    Thank you for your support.