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• avformat_open_input failed at openning local rtmp stream

  3 septembre 2019, par edhu

  I’m relatively new to this workflow and this might be a simple problem to solve. However, I haven’t found answers that matched exactly with my question. I’ve set up my nginx server with rtmp module and for testing purposes I used the following command to publish my stream :

  ffmpeg -re -i  -vcodec libx264 -vprofile baseline -acodec aac -strict -2 -f flv rtmp://localhost/show/stream

  After that, I launched up my application which is supposed to read the stream from the nginx server and it failed at

  avformat_open_input(&ctx, szFilePath, NULL, NULL);

  The returned error code is -5 and it signifies I/O issue. The szFilePath I passed in is rtmp://localhost/show/stream and I assume this will automatically work since it works when I tried to play some mp4 sample files online. I also tried rtmp://localhost:1935/show/stream and vice versa. I could view the stream being played in VLC but I can’t open it in the code. I’m not really sure what happened here. I feel like this isn’t necessarily a complicated issue but I don’t know where to start looking for possibles causes. I’d appreciate the help. Thanks !

• avformat/utils : return pending IO error on EOF in av_read_frame()

  24 août 2019, par Marton Balint

  avformat/utils : return pending IO error on EOF in av_read_frame()
  avio_feof() returns true both in case of actual EOF and in case of IO errors.
  
  Some demuxers (matroska) have special handling to be able to return the proper
  
  error for this exact reason, e.g. :
  if (avio_feof(pb)) 
  
       if (pb->error) 
  
           return pb->error ;
  
        else 
  
           return AVERROR_EOF ;
  
       
  
  
  However, most of the demuxers do not, and they simply return AVERROR_EOF if
  
  avio_feof() is true, so there is a real chance that IO errors are mistaken for
  
  EOF.
  We might just say that the API user should always check the IO context error
  
  attribute on EOF to make sure no IO errors happened, but not even ffmpeg.c does
  
  this. It should be more intuitive to the API user if we simply return the IO
  
  error as the return value of av_read_frame() instead of AVERROR_EOF.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/utils.c

• Accidentally overwrote dylib files to usr/local/lib by copying lib from application bundle

  21 août 2019, par random_permutation

  I overwrote some of my dylib files in /usr/local/bin/ and now I’m having issues running a program. Is there a way of restoring these files back ?

  The program ffmpeg was running fine for me. Then I installed the program GPAC and did the following :

  $ sudo cp MP4Box /usr/local/bin/
  
  
  
  $ sudo cp -R /Applications/GPAC.app/Contents/MacOS/lib/* /usr/local/lib/

  I did this because it would allow me to run MP4Box from the command line since /usr/local/lib/ is in $PATH.

  But now when I try running

  $ ffmpeg

  I get this error :

  dyld : Library not loaded : /usr/local/opt/sdl2/lib/libSDL2-2.0.0.dylib
  Referenced from : /usr/local/bin/ffmpeg Reason : Incompatible library
  version : ffmpeg requires version 10.0.0 or later, but
  libSDL2-2.0.0.dylib provides version 5.0.0 Abort trap : 6

  I think what happened is : I overwrote some files into /usr/local/lib/ that I shouldn’t have done. In this case, I overwrote the version 10.0.0 libSDL2-2.0.0.dylib with version 5.0.0 from the GPAC app bundle.

  I have tried using homebrew to uninstall and reinstall ffmpeg, hoping that it would see that it would need to update my dylib libraries.

  $ brew uninstall ffmpeg
  
  
  
  $ brew install ffmpeg
  
  
  
  $ ffmpeg

  But this results in the same error.

  Here is the list of all the files I copied from /Applications/GPAC.app/Contents/MacOS/lib/* to /usr/local/lib/

  libSDL2-2.0.0.dylib libfreetype.6.dylib libplds4.dylib
  liba52.0.dylib libgpac.dylib libpng16.16.dylib
  libavcodec.58.dylib libjpeg.9.dylib libpostproc.55.dylib
  libavdevice.58.dylib liblzma.5.dylib libssl.1.0.0.dylib
  libavfilter.7.dylib libmad.0.dylib libswresample.3.dylib
  libavformat.58.dylib libmozjs185.1.0.dylib libswscale.5.dylib
  libavresample.4.dylib libmp3lame.0.dylib libtheora.0.dylib
  libavutil.56.dylib libnspr4.dylib libvorbis.0.dylib
  libcrypto.1.0.0.dylib libogg.0.dylib libx264.152.dylib
  libfaad.2.dylib libplc4.dylib