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• Passing arguments to FFMPEG using subprocess.call()

  8 mai 2018, par Peter F

  I was working through this answer to an FFMPEG question and the command works just fine through the Windows 10 command prompt (I’ve only changed the input and output filenames) :

  ffmpeg -i test.mp4  -filter:v "select='gt(scene,0.4)',showinfo" -f null  - 2> test.txt

  My Python 3 script gives arguments (as a list) to the subprocess.call() function and works fine for a number of basic FFMPEG operations, but not this one ! It seems to be failing at the final null - 2> test.txt part, with the following error messages depending on how I split the arguments :

  [NULL @ 000001c7e556a3c0] [error] Unable to find a suitable output format for 'pipe:'
  
  [error] pipe:: Invalid argument
  
  
  
  [error] Unrecognized option '2> test.txt'.
  
  [fatal] Error splitting the argument list: Option not found
  
  
  
  [error] Unrecognized option '2>'.
  
  [fatal] Error splitting the argument list: Option not found

  Here’s the basic list of arguments I’ve been trying :

  args=['C:\\Program Files\\ffmpeg\\ffmpeg.exe',
  
        '-i',
  
        'test.mp4',
  
        '-filter:v "select=\'gt(scene,0.4)\',showinfo"',
  
        '-f null',
  
        '-',
  
        '2>',
  
        'test.txt']

  Plus various permutations combining and splitting the last few elements.

  Please could somebody help me with the right syntax for running FFMPEG with these arguments through Python 3 ?

  Many thanks - I just can’t see where I’m going wrong :(

• automatically convert all video to mp4 h264 [on hold]

  23 août 2013, par Xiabili

  I am a debian user and I have a lot of videos (wmv, flv, mp4 ... more than 100gb) on my server.

  The problem is that the most of these videos are with mpeg4 and these codec is not supported by our Wowza server (basic License).

  That is way we want to convert all these videos into H264 format.

  So I need a script that converts videos recursively in the folders and if possible remove the old files after the converting.

  I need your experience ! Thanks a lot !

  Regards

  Bili

• Conversion of individual mp4 files to ts yields unexpected playback

  3 août 2021, par MorenoGentili

  I'm converting three mp4 files (h264, no audio, each with a duration of three seconds) to the mpeg-ts format like so.

  


  ffmpeg -i 1.mp4 -c copy 1.ts
ffmpeg -i 2.mp4 -c copy 2.ts
ffmpeg -i 3.mp4 -c copy 3.ts


  


  Please note : I can't combine the mp4 files beforehand. Each one has to be converted individually as shown above since they're being generated by a live recorder.

  


  Then, I manually created a .m3u8 manifest like this one, so I could play those 3 ts files in sequence :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-TARGETDURATION:3
#EXTINF:3,
1.ts
#EXTINF:3,
2.ts
#EXTINF:3,
3.ts
#EXT-X-ENDLIST


  


  When I run the ffplay index.m3u8 command :

  


  

  • 1.ts is played for three seconds as expected ;

  


  • 2.ts is played "for a split second" (maybe just a frame) ;

  


  • 3.ts is played for three seconds as expected.

  


  


  Can someone explain why 2.ts is shown for such a brief time ? When I run ffmpeg -i 2.ts, the output is correctly displaying a duration of three seconds.

  


  Input #0, mpegts, from '2.ts':
  Duration: 00:00:03.00, start: 1.480000, bitrate: 49 kb/s


  


  How can I change my mp4 -> ts conversion commands so that each file can play for their whole duration (i.e. three seconds each) ? I'd like to avoid reencoding if possible.

  


  Thank you, I'm adding a link to the three files and the manifest for completeness.