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• avcodec/hevcdec : Output MD5-message in one piece

  22 juillet 2022, par Andreas Rheinhardt

  avcodec/hevcdec : Output MD5-message in one piece
  Otherwise, there is no guarantee that the various av_log-messages
  
  are not interrupted by another log statement. The latter may originate
  
  from anywhere else, even the HEVC decoder itself, as happens when
  
  one uses frame-threading to decode the BUMPING_A_ericsson_1.bit
  
  sample from the FATE-suite.
  Furthermore, the earlier approach suffered from the fact that
  
  various parts of the logmsg were output with different loglevels
  
  and that checking stopped after having encountered the first
  
  plane with MD5 mismatch, although it is probably interesting to
  
  know whether other planes are incorrect, too.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/hevcdec.c

• ffmpeg libstagefright init error : Malformed AVC codec specific data

  23 juillet 2014, par user3051473

  "hi", all... I try to use hw decoder by libstagefright with Android but so many mistakes frustrate me.
  I play ipcam rtsp stream with ffmpeg and I refer to the following tutorial :

  https://vec.io/posts/use-android-hardware-decoder-with-omxcodec-in-ndk

  It will check extradata[0] first as following, but the extradata[0] for ipcam rtsp stream is 0 instead of 1. If I commit the "if statement", OMXCodec tells me the error message "Malformed AVC codec specific data." when I call OMXCodec::Create().

      if (mVideoTrack->extradata[0] == 1) {
  
          mFormat->setData(kKeyAVCC, kTypeAVCC, mVideoTrack->extradata, mVideoTrack->extradata_size);
  
      }

  As far as I know that the extradata will store the sprop-parameter-sets comes from sdp protocol. But I don’t know why it checks the extradata[0] and whether it’s necessary. Can you please give me any instruction ? Thanks.

• How to extract track 2 left channel using ffmpeg ?

  1er mai 2019, par flash

  I am working on a mp4 file in which I want to extract Track 2 left channel using ffmpeg.

  

  I tried with the following command on terminal but it seems to extract Track 1 - [English] :

  ffmpeg -i 36017P.mp4 filename.mp3

  Problem Statement :

  I am wondering what changes I need to make in the ffmpeg command above so that it extract Track 2 -[English] from mp4 file.