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• NodeJS/ffmpeg : Can't create screenshot of stream file

  11 septembre 2017, par user3142695

  I need to create a screenshot via ffmpeg (node-fluent-ffmpeg : https://github.com/fluent-ffmpeg/node-fluent-ffmpeg) of a stream, as my data is stored in a gridFS.

  This is how I’m doing that with a local file - and it works so far

  ffmpeg('/Users/Anybody/Downloads/1test.mp4')
  
    .on('error', (error) => {
  
      console.error(error)
  
    })
  
    .on('end', () => {
  
      console.log('Screenshots taken')
  
    })
  
    .screenshots({
  
      folder: '/Users/Anybody/Downloads/',
  
      timestamps: ['00:01.000']
  
    })

  But if I change the code to use a stream (gridfs-stream), no file is created, although the output gives me a successful message :

  import Grid from 'gridfs-stream'
  
  
  
  const gfs = Grid(
  
    MongoInternals.defaultRemoteCollectionDriver().mongo.db,
  
    MongoInternals.NpmModule
  
  )
  
  
  
  ffmpeg(gfs.createReadStream({ _id: sourceId }))
  
    .on('filenames', (filenames) => {
  
      console.log('Will generate ' + filenames.join(', '))
  
    })
  
    .on('codecData', (data) => {
  
      console.log('Input is ' + data.audio + ' audio ' + 'with ' + data.video + ' video')
  
    })
  
    .on('error', (error) => {
  
      console.error(error)
  
    })
  
    .on('end', () => {
  
      console.log('Screenshots taken')
  
    })
  
    .screenshots({
  
      folder: '/Users/Anybody/Downloads/',
  
      timestamps: ['00:01.000']
  
    })

  Output

  Will generate tn.png
  
  Input is aac (mp4a / 0x6134706D) audio with h264 (avc1 / 0x31637661) video
  
  Screenshots taken

• Compensating for missing audio frames in video with ffmpeg [on hold]

  9 décembre 2015, par Ned Rockson

  I consistently have a problem with videos recorded via webrtc where the audio is missing for the first few seconds. With ffmpeg I see that the first audio frame is generally at PTS >1.0.

  This doesn’t cause an issue in isolation as video players are smart enough to adjust, but when using ffmpeg to merge two videos and mix their audio, they end up having offset audio because each audio stream is treated as starting at 0.

  Is there a way to compensate for this offset when using amerge or amix filters ?

• Revision 909cc86bd150e6ecd4b3368b4f3dcec274649648 : utiliser une globale pour les libelles des logo, ca permet de ...

  4 avril 2010, par Cerdic — Log

  utiliser une globale pour les libelles des logo, ca permet de personaliser, mais si on l’ecrase brutalement en arrivant dans inc/iconifier on a tout perdu. Init plus smart de la globale, donc git-svn-id : svn ://trac.rezo.net/spip/branches/spip-2.0@15578 (...)