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• FFmpeg. avcodec_find_encoder(AV_CODEC_ID_H264) return false

  14 juillet 2016, par Иван Чванов

  The problem : I can not connect the h264 codec for encoding and decoding of frames.

  ---

  Description :

  I downloaded from here ffmpeg library https://ffmpeg.zeranoe.com/builds/, version dev.

  Connect it to your project QT :

  extern "C"
  
  {
  
      #include 
  
      #include 
  
      #include 
  
      #include 
  
      #include 
  
  }
  
      
  
  #pragma comment (lib, "avcodec.lib")
  
  #pragma comment (lib, "avformat.lib")
  
  #pragma comment (lib, "swscale.lib")
  
  #pragma comment (lib, "avutil.lib")

  Next prescribe av_register_all(); to include all codecs.

  Next, call the function : avcodec_find_encoder(AV_CODEC_ID_H264), returns false.

  In the ReadMe file, the library said that it was collected with —enable-libx264 and —enable-gpl compile the keys including h264 codec that is supposed to be.

  If the call : avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO), it returns an object AVCodec, as it should.

  I use the MinGW compiler. OC Windows 7.

  How can I resolve or work around the problem ? Compile the library itself has not yet obtained. I understand you to connect sources and "poking" them, that too is meaningless.

  ---

  ** Once again, I will describe my problem : **

  I need to encode the codec h264 (can VP9) individual frames in one program, and then decode them in another program. You can use other libraries. The language C ++. It is necessary to use interframe compression codec, rather than simply pressed apart frames.

  Sorry for my english.

  Ideas. Advice. Suggestions.

• WMA decoding with ffmpeg failed

  24 novembre 2011, par Ali

  I have problem in decoding WMA/WMAPRO stream with ffmpeg.i have filled extra data from the coming stream.I am able to get bit rate, sample rate, extradata size and other parameters so there is no problem with the codecCtx initilization.

  avcodec_open(codecCtx, codec);

  returns -1

  Anyone help me !

• PHP FFMPEG not working when I upload mp4 file

  9 août 2013, par Chris

  To convert video to formats compatible with HTML5 video I wrote the following script :

      $srcFile = "name/of/the/video.mp4";
  
      $destFile = "/media/video/newfilename";
  
      $ffmpegPath = "/usr/local/bin/ffmpeg";
  
      $flvtool2Path = "/usr/local/bin/flvtool2";
  
  
  
      // Create our FFMPEG-PHP class
  
      $ffmpegObj = new ffmpeg_movie($srcFile);
  
      // Save our needed variables
  
      $srcWidth = makeMultipleTwo($ffmpegObj->getFrameWidth());
  
      $srcHeight = makeMultipleTwo($ffmpegObj->getFrameHeight());
  
      $srcFPS = $ffmpegObj->getFrameRate();
  
      $srcAB = intval($ffmpegObj->getAudioBitRate()/1000);
  
      $srcAR = $ffmpegObj->getAudioSampleRate();
  
      $srcVB = floor($ffmpegObj->getVideoBitRate()/1000); 
  
  
  
  
  
      // Call our convert using exec() to convert to the three file types needed by HTML5
  
      exec($ffmpegPath . " -i ". $srcFile ." -vcodec libx264 -vpre hq -vpre ipod640 -b ".$srcVB."k -bt 100k -acodec libfaac -ab " . $srcAB . "k -ac 2 -s " . $srcWidth . "x" . $srcHeight . " ".$destFile.".mp4");
  
  
  
      exec($ffmpegPath . " -i ". $srcFile ." -vcodec libvpx -r ".$srcFPS." -b ".$srcVB."k -acodec libvorbis -ab " . $srcAB . " -ac 2 -f webm -g 30 -s " . $srcWidth . "x" . $srcHeight . " ".$destFile.".webm");
  
  
  
      exec($ffmpegPath . " -i ". $srcFile ." -vcodec libtheora -r ".$srcFPS." -b ".$srcVB."k -acodec libvorbis -ab " . $srcAB . "k -ac 2 -s " . $srcWidth . "x" . $srcHeight . " ".$destFile.".ogv");

  It is supposed to take any input video type and convert it to mp4, ogv and webm. When I run the script on a .mov file it returns a mp4 and ogv file, but not webm. When I run it on a .mp4 file it returns no converted files at all. Is there something wrong with the way I am converting the files ? Any help ?