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• Correct way to dump yuv values after avcodec_decode_video2

  27 juin 2017, par Peter

  I am decoding H.265 raw data :

   avcodec_decode_video2(decoderCtx, pictYUV, &gotPicture, &packet)

  After the call, the value for pictYUV->format is AV_PIX_FMT_YUV420P as expected.

  I dump raw yuv values to a file as follows :

  fwrite(pictYUV->data[0], 1, w*h, f);
  
  fwrite(pictYUV->data[2], 1, w*h/4, f);
  
  fwrite(pictYUV->data[1], 1, w*h/4, f);

  For an input size of 640x480, when the file is viewed (using ImageMagick display utility), the image is what was expected.

  However, for an input size of 864x480, the image appears to be corrupted.

  What is interesting is if I run pictYUV through sws_scale, and dump the resulting yuv output, the image appears to be fine.

  sws_scale(swsCtx, pictYUV->data, pictYUV->linesize, 0, pictYUV->height,
  
    pictNewYUV->data, pictNewYUV->linesize);

  All I need is yuv data. I am hoping I can avoid the extra call to sws_scale. Wondering what is it that I am missing. Regards.

• FFMPEG streaming error : Failed to update header with correct filesize and duration

  9 septembre 2020, par Brindha Kanniah

  I am trying to stream an mp4 to a vlc player on my local computer at ip address 127.0.0.1:48550, but am encountering this error.

  



  Failed to update header with correct duration.
Failed to update header with correct filesize.


  



  I didn't have this problem when streaming on my mac, but am encountering it with a Windows pc.

  



  On my mac I am running ffmpeg 3.2.4, and on the pc, ffmpeg version N-86755-g0780ad9 built with gcc 7.1.0.

  



  Below is the VLC media player debug log :

  



  core debug: adding item `udp://127.0.0.1:48550' ( udp://127.0.0.1:48550 )
core debug: processing request item: udp://127.0.0.1:48550, node: null, skip: 0
core debug: rebuilding array of current - root Playlist
core debug: rebuild done - 1 items, index 0
core debug: starting playback of the new playlist item
core debug: resyncing on udp://127.0.0.1:48550
core debug: udp://127.0.0.1:48550 is at 0
core debug: creating new input thread
core debug: Creating an input for 'udp://127.0.0.1:48550'
core debug: meta ok for (null), need to fetch art
core debug: requesting art for udp://127.0.0.1:48550
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: using timeshift granularity of 50 MiB, in path 'C:\Users\Oculus\AppData\Local\Temp'
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: `udp://127.0.0.1:48550' gives access `udp' demux `' path `127.0.0.1:48550'
core debug: specified demux `any'
core debug: creating demux: access='udp' demux='any' location='127.0.0.1:48550' file='\\127.0.0.1:48550'
core debug: looking for access_demux module matching "udp": 12 candidates
core debug: no access_demux modules matched
core debug: creating access 'udp' location='127.0.0.1:48550', path='\\127.0.0.1:48550'
core debug: looking for access module matching "udp": 21 candidates
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
udp debug: opening server=127.0.0.1:48550 local=:1234
core debug: net: connecting to [127.0.0.1]:48550 from []:1234
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: using access module "udp"
core debug: Using block method for AStream*
core debug: starting pre-buffering
qt4 debug: IM: Setting an input


  



  Thoughts on why this is happening ? And on how to resolve this ?

  


• How to load correct libavcodec.so shared library version ? (53)

  6 août 2017, par user2212461

  I am using libavcodec and libavformat in my project but when I execute a binary which was built on another machine, I get the following error :

  error while loading shared libraries: libavcodec.so.53: cannot open shared object file: No such file or directory

  I installed ffmpeg with libav and trying the following commands :

  sudo apt-get install ffmpeg libavcodec-dev libavformat-dev
  
  sudo apt-get install ffmpeg libavcodec-extra-53
  
  sudo apt-get install libav-tools

  The error doesnt show up when I build the binary on the same machine, but it would be much faster to compile on a second machine.

  UDPATE : I also ran sudo apt-get install update and sudo apt-get install pkg-config without any change in the output. (OS = 12.04)