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there is an obvious noise when run both video and sound task on dm368.

xiang xu
Prodigy 160 points

Hi,

  My project is based on dm368 platform(H.264 Encoder, Version 1.10.00.08,    dvsdk version:3_10_00_16).

  I encountered a weird issue.

 It is very great when just captured the sound( I didnot encode with g711,just PCM 44100KB/S sample rate).

However,when run both sound and video(H264 encode),the soundt becomes terrible.

I spied on the sound waveform,there are a lot of pulses.

BTW,I don't know how to upload the attachment.Do we have this privilege?

Best regards!

 

 

 

 

 

 



  • 0
    TI__Intellectual 1840 points

    Hi Xiang,

     

    It might point to an issue, fixed in latest staging kernel. Both, audio and video were using same DMA queue and audio used to become noisy when video starts. The fix separates out DMA queue used by audio from DMA queue used by video codec. Can you please patch your kernel source with http://arago-project.org/git/people/?p=sneha/linux-davinci-staging.git;a=commitdiff;h=9d7571fc0e687b8233cf5045b78bc78367564328 and http://arago-project.org/git/people/?p=sneha/linux-davinci-staging.git;a=commitdiff;h=13bec5358aba6a6d56d8c498677f8d24663678ad and check.

    I would update the kernel to latest (http://arago-project.org/git/people/?p=sneha/linux-davinci-staging.git;a=summary) and give it a try.

    Regards

    Sajesh

  • 0 in reply to Sajesh Kumar Saran
    Prodigy 160 points

    Hi,

      Thanks for your help.

      I have update the kernel.There is no obvious noise.

      But , there is still a little nosie when encode both audio and video.

      It is very good just encode audio.

      Can you tell me the reason?

      Regards!