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• FFMpeg How to use multithreading ?

  7 avril 2017, par Wu NL

  I want to decode H264 by ffmpeg, BUT finally I found the decode function only used one cpu core

  system monitor

  env : Ubuntu 14.04 FFMpeg 3.2.4 CPU i7-7500U

  ---

  So, I search ffmpeg multithreading and decide using all cpu cores for decoding.
  I set AVCodecContext as this :

  //Init works
  
  //codecId=AV_CODEC_ID_H264;
  
  avcodec_register_all();
  
  pCodec = avcodec_find_decoder(codecId);
  
  if (!pCodec)
  
  {
  
      printf("Codec not found\n");
  
      return -1;
  
  }
  
  pCodecCtx = avcodec_alloc_context3(pCodec);
  
  if (!pCodecCtx)
  
  {
  
      printf("Could not allocate video codec context\n");
  
      return -1;
  
  }
  
  
  
  pCodecParserCtx=av_parser_init(codecId);
  
  if (!pCodecParserCtx)
  
  {
  
      printf("Could not allocate video parser context\n");
  
      return -1;
  
  }
  
  pCodecCtx->thread_count = 4;
  
  pCodecCtx->thread_type = FF_THREAD_FRAME;
  
  
  
  pCodec->capabilities &= CODEC_CAP_TRUNCATED;
  
  pCodecCtx->flags |= CODEC_FLAG_TRUNCATED;
  
  
  
  if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)
  
  {
  
      printf("Could not open codec\n");
  
      return -1;
  
  }
  
  av_log_set_level(AV_LOG_QUIET);
  
  av_init_packet(&packet);

  ---

  //parse and decode
  
  //after av_parser_parse2, the packet has a complete frame data
  
  //in decode function, I just call avcodec_decode_video2 and do some frame copy work
  
  while (cur_size>0)
  
  {
  
      int len = av_parser_parse2(
  
                    pCodecParserCtx, pCodecCtx,
  
                    &packet.data, &packet.size,
  
                    cur_ptr, cur_size,
  
                    AV_NOPTS_VALUE, AV_NOPTS_VALUE, AV_NOPTS_VALUE);
  
  
  
      cur_ptr += len;
  
      cur_size -= len;
  
      if(GetPacketSize()==0)
  
          continue;
  
  
  
      AVFrame *pFrame = av_frame_alloc();
  
      int ret = Decode(pFrame);
  
      if (ret < 0)
  
      {
  
          continue;
  
      }
  
      if (ret)
  
      {
  
        //some works
  
      }
  
  }

  But nothing different with before.
  How can I use multithreading in FFMpeg ? Any advise ?

• Inotifywait giving wrong file path after running ffmpeg

  23 mars 2019, par Morpheus

  So im running a little inotifywait script to monitor a folder for new files and transcode them if they are mxf and contain a video stream. But for some weird reason if the script does call ffmpeg the next fileevent by inotify is giving me a wrong path seemingly random cutting the filepath at any position.

  So far i tried moving the call to an external script, resetting the file variable which shouldnt matter anyway and adding a sleep to the script. I also tried using normal filepaths without whitespaces or - which shouldnt matter but that also didnt help.

  inotifywait -m -r -e close_write -e moved_to --format "%w%f"  "$dir" | while read f 
  
  
  
  do
  
              if ffprobe "$file" 2>&1 | egrep 'Stream #0:0: Video' && ffprobe "$file" 2>&1 | egrep 'MXF' ; then
  
                  mkdir -vp "$movepath" && mkdir -vp "$trans$path3"  && mkdir -vp "$trans2$path3" && mv -fu "$f" "$trans2$path" && \
  
                  ffmpeg -y -i "$file" -map_metadata 0 -c:v h264_nvenc -b:v 2m -bufsize 2m -profile:v baseline -level:v 3.0 -pix_fmt yuv420p -vf yadif,scale="iw/4:ih/4" -an "$transpath" 2>> copy_ffmpeg_log.txt
  
  done

  expected :

  /media/raid/TMO_Media/INGEST-HP.1/WacinS1_19V01.5C935C93A3B4V.mxf

  example for an result after transcode :

  cinS1_19A06.5C935C93A088A.mxf

  do while normal mv commands work and inotify does work as expected when stopped for transcoding a file the next path given by inotify is getting messed up

  link to the entire script : https://pastebin.com/aRNG4rqz

• FFMPEG mp4 videos not suddenly stops playing on Browsers

  14 janvier 2020, par Harley Lapuz

  I have been struggling with this issue in regards to playing my converted mp4 videos using FFMPEG into an html 5 video player, I basically just use a single video player and just replace the source when the video ends.

  What happens is that a MediaError occurs randomly with different videos saying :

  PIPELINE_ERROR_DECODE: Failed to send audio packet for decoding

  or

  PIPELINE_ERROR_DECODE: audio decode error

  Videos have no issues on Safari, Internet Explorer, and Firefox. But this error shows up randomly on Opera and Google Chrome.

  I am using Laravel [Laravel FFMpeg][1] to convert the videos, please see my conversion code below :

  $bitrateFormat = (new FFMpeg\Format\Video\X264('aac', 'libx264'))->setKiloBitrate(1500);
  
  
  
  $converted_video = FFMpeg::fromDisk('videos')
  
      ->open($this->video_id)
  
      ->addFilter(['-pix_fmt', 'yuv420p'], ['-movflags', '+faststart'])
  
      ->export()
  
      ->inFormat($bitrateFormat)
  
      ->toDisk('do_spaces_video')
  
      ->save($this->video_id);

  Any help would be appreciated guys, thanks in advance !

  EDIT - Added Media Internals Error

  00:04:02.892    for_suspended_start false
  
  00:04:02.892    pipeline_buffering_state    BUFFERING_HAVE_ENOUGH
  
  00:04:33.919    error   Failed to send audio packet for decoding: timestamp=272341333 duration=21333 size=346 side_data_size=0 is_key_frame=1 encrypted=0 discard_padding (us)=(0, 0)
  
  00:04:33.919    error   audio decode error
  
  00:04:33.943    error   audio error during playing, status: PIPELINE_ERROR_DECODE
  
  00:04:33.943    pipeline_error  PIPELINE_ERROR_DECODE
  
  00:04:33.944    pipeline_state  kStopping
  
  00:04:33.945    pipeline_state  kStopped
  
  00:04:33.950    event   PAUSE