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• tta : check output buffer size after adjusting frame length for last frame

  22 septembre 2011, par Justin Ruggles

  tta : check output buffer size after adjusting frame length for last frame

• 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.

• avformat/matroskaenc : Don't waste bytes to Write Tag length fields

  15 juin 2022, par Andreas Rheinhardt

  avformat/matroskaenc : Don't waste bytes to Write Tag length fields
  This is possible by using a dynamic buffer to write them ;
  
  said dynamic buffer is (re)used and reset as appropriate.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/matroskaenc.c
  • [DH] tests/ref/fate/aac-autobsf-adtstoasc
  • [DH] tests/ref/fate/matroska-avoid-negative-ts
  • [DH] tests/ref/fate/matroska-dovi-write-config7
  • [DH] tests/ref/fate/matroska-dovi-write-config8
  • [DH] tests/ref/fate/matroska-dvbsub-remux
  • [DH] tests/ref/fate/matroska-flac-extradata-update
  • [DH] tests/ref/fate/matroska-h264-remux
  • [DH] tests/ref/fate/matroska-mastering-display-metadata
  • [DH] tests/ref/fate/matroska-move-cues-to-front
  • [DH] tests/ref/fate/matroska-mpegts-remux
  • [DH] tests/ref/fate/matroska-ms-mode
  • [DH] tests/ref/fate/matroska-pgs-remux
  • [DH] tests/ref/fate/matroska-pgs-remux-durations
  • [DH] tests/ref/fate/matroska-qt-mode
  • [DH] tests/ref/fate/matroska-spherical-mono-remux
  • [DH] tests/ref/fate/matroska-vp8-alpha-remux
  • [DH] tests/ref/fate/matroska-zero-length-block
  • [DH] tests/ref/fate/rgb24-mkv
  • [DH] tests/ref/fate/webm-dash-chapters
  • [DH] tests/ref/fate/webm-webvtt-remux
  • [DH] tests/ref/lavf-fate/av1.mkv
  • [DH] tests/ref/lavf/mka
  • [DH] tests/ref/lavf/mkv
  • [DH] tests/ref/lavf/mkv_attachment
  • [DH] tests/ref/seek/lavf-mkv