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• ffmpeg audio video synchronisation mux

  19 juillet 2013, par Rahul Kumar

  I am trying to mux audio and video but the resultant is not what expected. The video is not shown in the output.

  rahul@hp : $ ffmpeg -i /Desktop/a.m4a -i /Desktop/a.mp4 -acodec copy -vcodec copy /Desktop/output.mkv
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  *** THIS PROGRAM IS DEPRECATED ***
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/rahul/Desktop/a.m4a' :
    Metadata :
      major_brand : dash
      minor_version : 0
      compatible_brands : iso6mp41
      creation_time : 2013-05-17 06:34:22
    Duration : 00:16:41.01, start : 500.506122, bitrate : 127 kb/s
      Stream #0.0(und) : Audio : aac, 44100 Hz, stereo, s16
      Metadata :
        creation_time : 2013-05-17 06:34:22
  Seems stream 0 codec frame rate differs from container frame rate : 47.95 (48000/1001) -> 23.97 (45000/1877)
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/home/rahul/Desktop/a.mp4' :
  
    Metadata :
  
      major_brand : dash
  
      minor_version : 0
  
      compatible_brands : iso6avc1mp41
  
      creation_time : 2013-05-17 06:34:22
  
    Duration : 00:16:40.61, start : 500.316311, bitrate : 675 kb/s
  
      Stream #1.0(und) : Video : h264 (Main), yuv420p, 1280x720, 23.97 tbr, 90k tbn, 47.95 tbc
  
      Metadata :
  
        creation_time : 2013-05-17 06:34:22
  
  Output #0, matroska, to '/home/rahul/Desktop/output.mkv' :
  
    Metadata :
  
      major_brand : dash
  
      minor_version : 0
  
      compatible_brands : iso6mp41
  
      creation_time : 2013-05-17 06:34:22
  
      encoder : Lavf53.21.1
  
      Stream #0.0(und) : Video : avc1 / 0x31637661, yuv420p, 1280x720, q=2-31, 1k tbn, 23.98 tbc
  
      Metadata :
  
        creation_time : 2013-05-17 06:34:22
  
      Stream #0.1(und) : Audio : aac, 44100 Hz, stereo
  
      Metadata :
  
        creation_time : 2013-05-17 06:34:22
  
  Stream mapping :
  
    Stream #1.0 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press ctrl-c to stop encoding
  
  frame=    0 fps=  0 q=-1.0 Lsize=   15643kB time=500.51 bitrate= 256.0kbits/s    
  
  video:0kB audio:15493kB global headers:0kB muxing overhead 0.967810%
  
  rahul@hp : $
  

  i tried using

  -map 0:v:0

  -map 1:v:0

  -map 0:v:1

  but all showed

  Number of stream maps must match number of output streams
  

• dashenc : add option to provide UTC timing source

  29 janvier 2017, par Peter Große

  dashenc : add option to provide UTC timing source
  If set, adds a UTCTiming tag in the manifest.
  This is part of the recommendations listed in the "Guidelines for
  
  Implementations : DASH-IF Interoperability Points" [1][2]
  
  Section 4.7 describes means for the Availability Time Synchronization.
  A usable default is "https://time.akamai.com/?iso" ;
  [1] http://dashif.org/guidelines/
  
  [2] http://dashif.org/wp-content/uploads/2016/12/DASH-IF-IOP-v4.0-clean.pdf
  
      (current version as of writing)
  Signed-off-by : Peter Große <pegro@friiks.de>
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/dashenc.c

• How to convert mpd file to mp4 ? [on hold]

  18 avril 2017, par Aminie

  I have a MPD file, and i want to convert it to a MP4 file using node.js so it could be saved into an object storage.
  Is there a simple way of doing so ?
  I used mpeg-dash player to play the video, but couldn’t find a way of saving the file through my code.