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• ffmpeg not producing duration value when converting a media file. If this media is used in an html player, seeking fails on some browsers

  4 décembre 2020, par David

  I'm asking this question because I didn't find information on the web and this seems to be uncommon issue. After a lot of trial and error I'm creating this answer for reference.

  


  I'm using python which runs the ffmpeg command to convert an MP4 into WEBM file. I noticed that some of the conversions didn't seek when displaying in the webpage but other webm files worked on the same server. I was converting from two different machines. The core problem was the ffmpeg command was using pipe during the conversion process on one machine and output directly to a file on the other.

  


  Apparently doing this doesn't populate the duration attribute in the file but if I ran ffmpeg with the same switches, same order and output to a file on the system, the duration attribute would populate.

  


  I was converting from MP4 to WEBM format using opus for the audio. This issue might only impact certain file types, webm as an example and not others.

  


• ffmpeg after converting avi to mp4 need wait till video loads in flash player 100% otherwise video is buffering

  28 octobre 2013, par Xenos Trojanowicz

  So if fixed all issues with my ffmpeg journey now I just need that after converting videos they play in flash player instantly and no need to wait till video loeaded 100% I use :

  if ($success_msg) {
  
      $tmp_parts = explode('.', $file['name']);
  
      $ext = array_pop($tmp_parts);
  
      $ext = strtolower($ext);
  
      if($ext == "avi" && $convert_avi == true) {
  
          $convert_source = _VIDEOS_DIR_PATH.$new_name;
  
          $conv_name = substr(md5($file['name'].rand(1,888)), 2, 10).".mp4";
  
          $converted_file  = _VIDEOS_DIR_PATH.$conv_name;
  
          $ffmpeg_command = 'ffmpeg -i '.$convert_source.' -acodec libfaac -vcodec libx264 -s 1280x720 -ar 44100 -async 44100 -r 29.970 -ac 2 -qscale 5 '.$converted_file;
  
          echo exec($ffmpeg_command);
  
          $sql = "UPDATE pm_temp SET url = '".$conv_name."' WHERE url = '".$new_name."' LIMIT 1";
  
          $result = @mysql_query($sql);
  
          unlink($convert_source);
  
      }
  
      echo $success_msg;
  
  }

  To convert videos

  EDIT #1 ffmpeg concole output with faststart function :

  root@1tb:~# ffmpeg -i sample.avi -movflags faststart -acodec libfaac -vcodec libx264 -s 1280x720 -ar 44100 -async 44100 -r 29.970 -ac 2 -qscale 5 consample.mp4
  
  ffmpeg version 0.7.15, Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Feb 22 2013 07:18:58 with gcc 4.4.5
  
    configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-libvpx --enable-librtmp --extra-libs=-lgcrypt --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [mp3 @ 0x15389100] Header missing
  
  [mpeg4 @ 0x15386dc0] Invalid and inefficient vfw-avi packed B frames detected
  
  Input #0, avi, from 'sample.avi':
  
    Metadata:
  
      encoder         : VirtualDubMod 1.5.10.2 (build 2540/release)
  
    Duration: 00:01:01.81, start: 0.000000, bitrate: 1194 kb/s
  
      Stream #0.0: Video: mpeg4, yuv420p, 640x352 [PAR 1:1 DAR 20:11], 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s
  
  [MOV/3GP/MP4/3G2 muxer @ 0x15386c80] [Eval @ 0x7ffffec71230] Undefined constant or missing '(' in 'faststart'
  
  [MOV/3GP/MP4/3G2 muxer @ 0x15386c80] Unable to parse option value "faststart"
  
  Invalid value 'movflags' for option 'faststart'

• Fail to decode a video with ffmpeg, but it can be played by video player

  23 juin 2022, par south

  i have a video witch can be played by players. But, I failed to decode it using ffmpeg 3.4.
Actually， it failed on the ffmpeg libs compiled by myself, but success on a common ffmpeg-3.4 lib of my company.

  



  My compilation seems success, as i can use it to decode most of my videos.

  



  Whats wrong with my lib ? If i should enable some special options when compiling ?
Anything special on this video ?

  



  error message :

  



  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x31b7120] STSC entry 1 is invalid (first=12 count=0 id=1)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x31b7120] stream 0, contradictionary STSC and STCO
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x31b7120] error reading header


  



  video info dumped when i use libs of my company

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'aaa':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2019-08-06T16:42:23.000000Z
  Duration: 00:00:10.89, start: 0.000000, bitrate: N/A
    Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 2815 kb/s, 25.66 fps, 25.64 tbr, 1k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2019-08-06T16:42:24.000000Z
      handler_name    :
      encoder         : VC Coding
--------------------