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• Revision cbfbc988229ca16c25a410a2ba38058c02043c89 : avant d’ajouter betement un ’s’ au type d’objet, on cherche d’abord a ...

  6 décembre 2010, par Fil — Log

  avant d’ajouter betement un ’s’ au type d’objet, on cherche d’abord a savoir si la table existe en realite (cf. paolo sur http://archives.rezo.net/archives/spip-zone.mbox/7PUHSSUJYU3ZEGEGCC4MM5XCSCBRKO43/ ) git-svn-id : svn ://trac.rezo.net/spip/spip@16626 (...)

• using ffmpeg to convert a mkv or mp4 suitable for a DVD player that supports MPEG-4 / DivX [closed]

  17 juillet 2022, par Neil Telford

  I got a DVD Player with USB support. It is a recent player (DVD-225), but the documentation is sparse, but it does claim MPEG-4 and DivX support.

  


  Now, I have got certain AVI files to play via USB, but everything else fails. I looked at the metadata of an AVI file that worked via ffprobe, and got the following :

  


  Metadata:
    encoder         : Lavf58.17.101   Duration: 00:58:30.94, start: 0.000000, bitrate: 1336 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 640x290 [SAR 1:1 DAR 64:29], 1196 kb/s, 23.98 fps, 23.98 tbr,
23.98 tbn, 23.98 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 128 kb/s


  


  Now, I figured that if I can replicate the above, I can convert most things to play via USB, even if it isn't the most up to date codecs.

  


  I've tried various combinations, but they all fail. The closest I got was by using the following shell script :

  


  for i in *.avi; do ffmpeg -i "$i" -c:v mpeg4 -vtag divx -qscale:v 3 -c:a libmp3lame -qscale:a 4 "_${i%.*}.avi"; done


  


  This has a strange result that it will play the audio track, but not the video track. The metadata I got from this was :

  


  Metadata:
    encoder         : Lavf58.45.100
  Duration: 00:58:07.99, start: 0.000000, bitrate: 3026 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (divx / 0x78766964), yuv420p, 1280x720 [SAR 3:4 DAR 4:3], 2901 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 24k tbc
    Metadata:
      title           : ******************
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 109 kb/s
    Metadata:
      title           : ******************


  


  Does anyone know where I am going wrong with this ? I've converted AVI, MKV and MP4 files, and while they work on my computer, the DVD player seems to be very picky.

  


  Any suggestions ?

  


  Thanks
Neil

  


• If multiple channels, merge then take sample length from audio file and save it to s3

  18 mai 2017, par khinester

  I am using transloadit to extract the audio from a video file, which is then saved to S3.
  This works great, but I wanted to know how to :

  1. check if the file has multiple channels and then squash it inot one as per https://transloadit.com/demos/audio-encoding/merging-multiple-audio-streams/ - do I need to check for this or do i default to use this robot ?

  2. extract a small sample from the audio file - and save this as a separate file.

  For example, I have a 2h audio file from which I want to take 5% of the length and save this as sample.mp3

  In ffmpeg, i can cut :

  ffmpeg -ss 0 -t 30 -i original.mp3 sample.mp3

  but I am unsure how to chain this workflow, here is what i have thus far :

  const opts = {
  
    params: {
  
      notify_url: `${ process.env.SELF }/services/trans/${ jwToken }`,
  
      steps:      {
  
        import: {
  
          robot:  '/s3/import',
  
          use:    ':original',
  
          bucket: process.env.S3_INGEST,
  
          path:   ingest.key,
  
          key:    process.env.AWS_ID,
  
          secret: process.env.AWS_SECRET,
  
        },
  
        encode: {
  
          robot:        '/audio/encode',
  
          use:          'import',
  
          ffmpeg_stack: 'v2.2.3',
  
          preset:       'aac',
  
          ffmpeg:       {
  
            ab:  '128k',
  
          },
  
        },
  
        export: {
  
          robot:   '/s3/store',
  
          use:     'encode',
  
          bucket:  s3Export,
  
          path:    `${ prefix }/${ token }.m4a`,
  
          headers: {
  
            'Content-Type': 'audio/mp4',
  
            'x-amz-server-side-encryption': 'AES256',
  
          },
  
          key:    process.env.AWS_ID,
  
          secret: process.env.AWS_SECRET,
  
        },
  
      },
  
    },
  
  };

  in the docs, https://transloadit.com/docs/conversion-robots/ i can’t see how to do this ?

  any advice is much appreciated.