Sur d’autres sites (3683)

• vaapi_encode : Destroy output buffer pool before VA context

  17 décembre 2017, par Mark Thompson

  vaapi_encode : Destroy output buffer pool before VA context
  The buffers are created associated with the context, so they should be
  
  destroyed before the context is.  This is enforced by the iHD driver.
  

  • [DBH] libavcodec/vaapi_encode.c

• Use ffmpeg to extract/remix audio from/into video

  2 décembre 2023, par user37143

  Working on a Mac, I have a bunch of .mkv files that I want to extract the audio from, then use an ML model I have in order to translate them and then mix them back into the video.

  


  For the extraction phase, I am running :
ffmpeg -i {input_video}.mkv -map 0:a -c copy {output_audio}.aac
however I am getting these errors :

  


  [adts @ 0x130708b30] Only AAC streams can be muxed by the ADTS muxer
[out#0/adts @ 0x6000031943c0] Could not write header (incorrect codec parameters ?): Invalid argument
[aost#0:1/copy @ 0x13070a050] Error initializing output stream: 


  


  which I suspect are because of subtitles, seeing these warnings earlier in the output :

  


  [matroska,webm @ 0x130704260] Could not find codec parameters for stream 4 (Subtitle: (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[matroska,webm @ 0x130704260] Could not find codec parameters for stream 5 (Subtitle:  (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[matroska,webm @ 0x130704260] Could not find codec parameters for stream 6 (Attachment: none): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options


  


  The only command that has worked for me so far is
ffmpeg -i {input_video}.mkv -vn -c:a aac {output_aduio}.wav which however created a completely empty audio file.

  


  Any help would be greatly appreciated

  


• FFMpeg : ffmpeg failed to execute command error

  4 mars 2020, par Richard McFriend Oluwamuyiwa

  I am trying to transcode a video file of 1.2mb file uploaded to my website server via php/html upload, but I keep getting the error :

  PHP Fatal error :

  Uncaught exception
  ’Alchemy\BinaryDriver\Exception\ExecutionFailureException’ with
  message ’ffmpeg failed to execute command ’/usr/local/bin/ffmpeg’ ’-y’
  ’-i’
  ’/home/user/public_html/contents/videos/1490719990_MP4_360p_Short_video_clip_nature_mp4.mp4’
  ’-async’ ’1’ ’-metadata:s:v:0’ ’start_time=0’ ’-r’ ’16’ ’-b_strategy’
  ’1’ ’-bf’ ’3’ ’-g’ ’9’ ’-vcodec’ ’libx264’ ’-acodec’ ’libmp3lame’
  ’-b:v’ ’128k’ ’-refs’ ’6’ ’-coder’ ’1’ ’-sc_threshold’ ’40’ ’-flags’
  ’+loop’ ’-me_range’ ’16’ ’-subq’ ’7’ ’-i_qfactor’ ’0.71’ ’-qcomp’
  ’0.6’ ’-qdiff’ ’4’ ’-trellis’ ’1’ ’-b:a’ ’8k’ ’-ac’ ’1’ ’-pass’ ’1’
  ’-passlogfile’
  ’/tmp/ffmpeg-passes58dab05a323b6eknk4/pass-58dab05a32465’
  ’/home/user/public_html/contents/videos/1490719990_MP4_360p_Short_video_clip_nature_mp4_22995.mp4’’
  in
  /home/user/public_html/app/ffmpeg/vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php:100

  Stack trace :

  0 /home/user/public_html/app/ffmpeg/vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php(72) :

  Alch in
  /home/user/public_html/app/ffmpeg/vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Media/Video.php
  on line 168

  Funny thing is that the same server is extracting frames and getting duration of the same file using ffprobe and ffmpeg.

  Here is the code I am using to transcode :

  $ffmpeg = $ffmpeg = FFMpeg\FFMpeg::create(['timeout'=>3600, 'ffmpeg.thread'=>12, 'ffmpeg.binaries'  => '/usr/local/bin/ffmpeg',
  
      'ffprobe.binaries' => '/usr/local/bin/ffprobe']);
  
  
  
              $ffprobe_prep = FFMpeg\FFProbe::create(['ffmpeg.binaries'  => '/usr/local/bin/ffmpeg',
  
      'ffprobe.binaries' => '/usr/local/bin/ffprobe']);
  
              $ffprobe = $ffprobe_prep->format($video_file);
  
  
  
              $video = $ffmpeg->open($video_file);
  
  
  
              // Get video duration to ensure our videos are never longer than our video limit.
  
              $duration = $ffprobe->get('duration');
  
  
  
              // Use mp4 format and set the audio bitrate to 56Kbit and Mono channel.
  
              // TODO: Try stereo later...
  
              $format = new FFMpeg\Format\Video\X264('libmp3lame', 'libx264');
  
              $format
  
                  -> setKiloBitrate(128)
  
                  -> setAudioChannels(1)
  
                  -> setAudioKiloBitrate(8);
  
  
  
              $first = $ffprobe_prep
  
                          ->streams($video_file)
  
                          ->videos()
  
                          ->first();
  
  
  
              $width = $first->get('width');
  
  
  
              if($width > VIDEO_WIDTH){
  
                  // Resize to 558 x 314 and resize to fit width.
  
                  $video
  
                      ->filters()
  
                      ->resize(new FFMpeg\Coordinate\Dimension(VIDEO_WIDTH, ceil(VIDEO_WIDTH / 16 * 9)));
  
              }
  
  
  
              // Trim to videos longer than three minutes to 3 minutes.
  
              if($duration > MAX_VIDEO_PLAYTIME){
  
  
  
                  $video
  
                      ->filters()
  
                      ->clip(FFMpeg\Coordinate\TimeCode::fromSeconds(0), FFMpeg\Coordinate\TimeCode::fromSeconds(MAX_VIDEO_PLAYTIME));
  
              }
  
  
  
              // Change the framerate to 16fps and GOP as 9.
  
              $video
  
                  ->filters()
  
                  ->framerate(new FFMpeg\Coordinate\FrameRate(16), 9);
  
  
  
              // Synchronize audio and video
  
              $video->filters()->synchronize();
  
  
  
              $video->save($format, $video_file_new_2);

  I have contacted my host to no vital assistance. The only useful information they can provide me is that ffmpeg was compiled on the server with libmp3lame support.

  This code works perfect on localhost

  Any help as to why I may be getting the error and how to correct it is appreciated.