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• Video buffering/streaming with node-fluent-ffmpeg

  24 février 2018, par Salies

  I want to turn AC3-audio videos playable on browsers. For this, I decided to use fluent-ffmpeg to real-time convert the videos and stream them. It works as livestreaming/piping pretty well, but you can’t even go back in the videos.

  app.get('/video', function (req, res) {
  
    var path = 'show.mkv';
  
    ffmpeg(path)
  
      .outputOptions(arr)
  
      .on('end', function () {
  
        console.log('file has been converted succesfully');
  
      })
  
      .on('error', function (err) {
  
        console.log('an error happened: ' + err.message);
  
      })
  
      .pipe(res);
  
  });

  So I need to build a sort of buffer for the conversion, this is, to let the user go back and forth in the video. I’ve found some code that does exactly what I need, although it doesn’t convert :

  app.get('/video', function(req, res) {
  
    const path = 'assets/sample.mp4'
  
    const stat = fs.statSync(path)
  
    const fileSize = stat.size
  
    const range = req.headers.range
  
  
  
    if (range) {
  
      const parts = range.replace(/bytes=/, "").split("-")
  
      const start = parseInt(parts[0], 10)
  
      const end = parts[1]
  
        ? parseInt(parts[1], 10)
  
        : fileSize-1
  
  
  
      const chunksize = (end-start)+1
  
      const file = fs.createReadStream(path, {start, end})
  
      const head = {
  
        'Content-Range': `bytes ${start}-${end}/${fileSize}`,
  
        'Accept-Ranges': 'bytes',
  
        'Content-Length': chunksize,
  
        'Content-Type': 'video/mp4',
  
      }
  
  
  
      res.writeHead(206, head)
  
      file.pipe(res)
  
    } else {
  
      const head = {
  
        'Content-Length': fileSize,
  
        'Content-Type': 'video/mp4',
  
      }
  
      res.writeHead(200, head)
  
      fs.createReadStream(path).pipe(res)
  
    }
  
  })

  (from https://github.com/daspinola/video-stream-sample)

  I’ve been trying to make fluent-ffmpeg work with buffering, with no success, and I pretty much have no clue on what to do. If buffering isn’t possible, is there an similar alternative excpect for pre-converting the videos ? Thanks already.

• Extract scene change info from a video file

  18 novembre 2018, par Ray P.

  Is there a way to extract scene change information from a video file using XVid in Python ? For example : I have an .mkv file, and I need to get a .log scene change file (Xvid 2nd pass stat file) to use for subtitles timing. SCXvid can create such files, but I’d like to do this in Python if possible.

  The reason why I need this is because the only way to do it on Linux is to use SCXvid-standalone which requires y4m files, and I need to use files in their original format.

• Got incorrect audio duration from ffmpeg

  8 septembre 2021, par Remeraze

  I used an ffmpeg command to export parts of an audio clip :

  


  ffmpeg -i {path} -acodec copy -ss {start_time} -to {end_time} {output_path}


  


  Unfortunately, this has the side effect of not changing the time duration in the file's details section, making many programs I use think the time of the cut audio files is much more than it really is.

  


  Is there a way to either make ffmpeg change the duration, or find a command in python that can change an audio file's "length" stat so I can do it manually ? I couldn't find any way online.

  


  Thanks.