Sur d’autres sites (9807)

• calculate the real duration time of a broken movie with ffmpeg/ffprobe

  26 octobre 2012, par jAckOdE

  I have a broken video file that its ffprobe (ffprobe -i movie.mkv) say its duration is about 2 hours, but the file contains only video data for first 8minutes (check by VLC Player).

  How can i get the real duration (8minutes) using ffmpeg or ffprobe ?

  here is the output :

  ffprobe version 0.7.13, Copyright (c) 2007-2011 the FFmpeg developers
  
    built on Aug  1 2012 21:08:35 with clang 3.1 (tags/Apple/clang-318.0.58)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libopenjpeg --enable-libvpx --enable-libspeex --disable-libopencore-amrnb --disable-libopencore-amrwb --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [matroska,webm @ 0x7f93dc01e600] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, matroska,webm, from 'Mission.mkv':
  
    Duration: 02:12:56.21, start: 0.000000, bitrate: 448 kb/s
  
      Stream #0.0: Video: mpeg4, yuv420p, 1280x528 [PAR 1:1 DAR 80:33], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
  
      Stream #0.1: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s (default)

• Capture raw video byte stream for real time transcoding

  9 septembre 2012, par user1145905

  I would like to achieve the following :

  Set up a proxy server to handle video requests by clients (for now, say all video requests from any Android video client) from a remote video server like YouTube, Vimeo, etc. I don't have access to the video files being requested, hence the need for a proxy server. I have settled for Squid. This proxy should process the video signal/stream being passed from the remote server before relaying it back to the requesting client.

  To achieve the above, I would either

  1. Need to figure out the precise location (URL) of the video resource being requested, download it really fast, and modify it as I want before HTTP streaming it back to the client as the transcoding continues (simultaneously, with some latency)

  2. Access the raw byte stream, pipe it into a transcoder (I'm thinking ffmpeg) and proceed with the streaming to client (also with some expected latency).

  Option #2 seems tricky to do but lends more flexibility to the kind of transcoding I would like to perform. I would have to actually handle raw data/packets, but I don't know if ffmpeg takes such input.

  In short, I'm looking for a solution to implement real-time transcoding of videos that I do not have direct access to from my proxy. Any suggestions on the tools or approaches I could use ? I have also read about Gstreamer (but could not tell if it's applicable to my situation), and MPlayer/MEncoder.

  And finally, a rather specific question : Are there any tools out there that, given a YouTube video URL, can download the byte stream for further processing ? That is, something similar to the Chrome YouTube downloader but one that can be integrated with a server-side script ?

  Thanks for any pointers/suggestions !

• error in hls play video streaming with ffmpeg real time manipulation

  4 août 2019, par Mohsen Rahnamaei

  I am using fluent ffmpeg to write something on video streaming real-time
  means that I am using this tool to write text on every ts file which server wants to serve in order to response the hls request from client :
  in server iam using this code :

  res.setHeader('Content-Type', CONTENT_TYPE.SEGMENT)
  
  res.statusCode = 200
  
  var proc = ffmpeg(req.filePath).videoFilters({
  
        filter: 'drawtext',
  
        options: {
  
          text: 'VERY LONG TEXT VERY VERY VERY VERY LOL!!!',
  
          fontsize: 36,
  
          fontcolor: 'white',
  
          x: '(main_w/2-text_w/2)',
  
          y: '(text_h/2)+15',
  
          shadowcolor: 'black',
  
          shadowx: 2,
  
          shadowy: 2
  
        }
  
      }
  
  
  
    )
  
  
  
  
  
    .videoCodec('libx264')
  
  
  
    .audioCodec('aac')
  
  
  
  
  
    .format('mpegts')
  
  
  
    .on('end', function (stdout, stderr) {
  
  
  
      console.log('Transcoding succeeded !', req.filePath);
  
  
  
    })
  
  
  
    .on('error', function (err) {
  
      console.log('an error happened: ' + err.message);
  
    }).pipe(res, {
  
      end: true
  
    })

  but in client just play first ts file and after that, I get this log in the console :

  [log] > AVC:6798 ms overlapping between fragments detected
  
  blob:http://demo.jwp…a8dc-56b513684988:1 
  
  [log] > Video/PTS/DTS adjusted: 6798/6798,delta:-6798 ms
  
  blob:http://demo.jwp…a8dc-56b513684988:1 

  and a bunch of this log :

  [warn] > Dropping 1 audio frame @ 6.805s due to 6797 ms overlap.

  what should I do ?????