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• How to get a list of libraries ffmpeg has linked to (static ffmpeg libraries) ?

  22 octobre 2012, par myWallJSON

  I have compiled Ffmpeg (1.0) with newt configuration :

  ./configure  --disable-doc  --disable-ffplay --disable-ffprobe  --disable-ffserver    --disable-avdevice   --disable-avfilter   --disable-pthreads  --disable-everything --enable-muxer=flv --enable-encoder=flv --enable-encoder=h263 --disable-mmx  --disable-shared   --prefix=bin/  --disable-protocols --disable-network --disable-debug  --disable-asm --disable-stripping

  It compiled - no errors - headers and libs (static .a) are in place. (special experimental cigwin, experimental gcc, with no asm options, and no known by ffmpeg platform defines) (yet I have compiled and tested boost on it)

  Now I try to compile my app. I get next exceptions :

  ../ffmpeg-1.0/bin/lib/libavcodec.a: error: undefined reference to 'exp'
  
  ../ffmpeg-1.0/bin/lib/libavcodec.a: error: undefined reference to 'log'

  My compiler build line looks like this :

  g++ -static -emit-swf -o CloudClient.swf  -I../boost/boost_libraries/install-dir/include -I../ffmpeg-1.0/bin/include -L../boost/boost_libraries/install-dir/lib -L../ffmpeg-1.0/bin/lib \
  
      timer.o \
  
      audio_encoder.o \
  
      audio_generator.o \
  
      video_encoder.o \
  
      video_generator_rainbow.o \
  
      simple_synchronizer.o \
  
      multiplexer.o \
  
      transmitter.o \
  
      graph_runner.o \
  
      cloud_client.o \
  
      -pthread \
  
      -lswscale \
  
      -lavutil \
  
      -lavformat \
  
      -lavcodec \
  
      -lboost_system \
  
      -lboost_date_time \
  
      -lboost_thread 

  So as you see quite complex and I already have all object files compiled and ready... Only one thing left - link it all to ffmpeg (striped from ffmpeg version compiled with boost)

  Tried adding -lm - no help...

  Well here my question is - how to get list of libraries ffmpeg linked to (like -lm etc) ?

• ffmpeg : How to get list of available codecs with PHP ?

  9 août 2013, par IIIOXIII

  Problem is, I am trying to convert (through php), a .3gp (or any video format) file to ogg.

  When I do not specify -vcodec and -acodec, the video is converted, but does not have any audio.

  I had read here and other places that I need to specify -acodec libvorbis, however, when I specify the codec as libvorbis, the conversion fails : video converts to 0byte file.

  Basically, I am trying to determine if the codec specified is actually part of the ffmpeg build I am using as a process of narrowing down my issue.

  Code that produces full length video without sound :

  $srcFile = 'anyvideo.3gp';
  
  $destFile = 'anyvideo.ogg';
  
  $ffmpegPath = 'path/to/ffmpeg.exe';
  
  $ffmpegObj = new ffmpeg_movie($srcFile);
  
  $srcWidth = makeMultipleTwo($ffmpegObj->getFrameWidth()); 
  
  $srcHeight = makeMultipleTwo($ffmpegObj->getFrameHeight());
  
  $srcFPS = $ffmpegObj->getFrameRate(); 
  
  $srcAB = intval($ffmpegObj->getAudioBitRate()/1000);
  
  $srcAR = $ffmpegObj->getAudioSampleRate();
  
  $srcLen = $ffmpegObj->getDuration();
  
  
  
  exec($ffmpegPath." -i ".$srcFile." -ar ".$srcAR." -s ".$srcWidth."x".$srcHeight." ". $destFile);

  And the code that produces 0byte file :

  exec($ffmpegPath." -i ".$srcFile." -acodec libvorbis -ar ".$srcAR." -s ".$srcWidth."x".$srcHeight." ".$destFile);

  So, my question is, how do I determine the codec's available to ffmpeg using PHP ? Can it even be done ?

  UPDATED - ANSWER BELOW

• List of Capture devices libav FFmpeg

  28 juin 2016, par esprittn

  Could anyone please, tell me how can I obtain a list of devices using libav like when I execute this ffmpeg command line

  ffmpeg -list_devices true -f dshow -i dummy

  Thanks for you great job and for your help