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• ffmpeg drops the moov atom when coverting mp4 to ogg, flv, or webm

  31 janvier 2014, par user1370897

  I'm using processor qtfaststart and the gem paperclip-ffmpeg in Rails to convert an mp4 file to either ogg, webm, or flv. However, I haven't had any success converting the mp4 file to these formats for streaming purposes because the moov atom gets dropped (converting mp4 to mp4 keeps its moov atom though*).

  I did a $ qtfaststart -l on the original mp4 file and I get this :

  ftyp (24 bytes)
  
  moov (5691 bytes)
  
  free (399309 bytes)
  
  mdat (12312760 bytes)

  Which shows me that the mp4 file has an moov atom in there. The command that paperclip-ffmpeg is executing is something like this :

  $ ffmpeg -i ~/Movies/VID_20140119_134445.mp4 -acodec libvorbis -ac 2 -ab 96k -ar 44100 -s 640x360 -y ~/tmp/iguana.webm

  However, doing a qtfaststart on the new file (iguana.webm) I get the following :

  $ qtfaststart -l ~/tmp/iguana.webm 
  
  moov atom not found, is this a valid MOV/MP4 file?
  
  Traceback (most recent call last):
  
  File "/usr/local/bin/qtfaststart", line 5, in <module>
  
  pkg_resources.run_script(&#39;qtfaststart==1.8&#39;, &#39;qtfaststart&#39;)
  
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 489, in run_script
  
  self.require(requires)[0].run_script(script_name, ns)
  
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 1214, in run_script
  
  exec script_code in namespace, namespace
  
  File "/Library/Python/2.7/site-packages/qtfaststart-1.8-py2.7.egg/EGG-INFO/scripts/qtfaststart", line 17, in <module>
  
  
  
  File "build/bdist.macosx-10.9-intel/egg/qtfaststart/command.py", line 44, in run
  
  File "build/bdist.macosx-10.9-intel/egg/qtfaststart/processor.py", line 65, in get_index
  
  File "build/bdist.macosx-10.9-intel/egg/qtfaststart/processor.py", line 106, in _ensure_valid_index
  
  qtfaststart.exceptions.FastStartException
  
  </module></module>

  I've also tried adding the option -movflags faststart to the command ffmpeg but ffmpeg still keeps dropping the moov atom to the output file.

  I'm using Rails 4, paperclip-ffmpeg 1.0.1, ffmpeg 2.1.3 Built on Jan 28 2014. Any help would be greatly appreciated.

• Does ffmpeg not support icod ? Where sould I start to dig the issue ?

  3 février 2014, par hdf

  I try to decode some video files using ffmpeg, but get errors caused by icod codec.
  Here's the file's ffprobe info :

  user:~$ ffprobe input.mov
  
  ffprobe version 1.2.3 Copyright (c) 2007-2013 the FFmpeg developers
  
    built on Jan 15 2014 23:08:14 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
  
    configuration: --enable-zlib --enable-libmp3lame --enable-libx264 --enable-gpl --enable-nonfree --enable-pic

  ...

      Stream #0:0(eng): Video: none (icod / 0x646F6369), 1280x720, 52569 kb/s, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 5994 tbn, 5994 tbc
  
      Metadata:
  
        creation_time   : 2014-01-27 05:09:24
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 21:03:24:08
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2014-01-27 05:09:24
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
  
      Metadata:
  
        creation_time   : 2014-01-27 05:09:24
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 21:03:24:08
  
  Unsupported codec with id 0 for input stream 0
  
  Unsupported codec with id 0 for input stream 2

• Redirect video stream from an Ip

  23 juin 2017, par Psykomusic

  I’m developping an embded device with Yocto (krogoth) OS. The device belong to a network with IpCamera. I’m looking for a light solution to redirect the stream received from a port and forward it to an other IP.
  I don’t know if it clear enought but for the moment I use GStreamer and this command :
  gst-launch-0.10 udpsrc port=myport ! udpsink host=xxx.xxx.xxx.xxx port=otherport.

  I hope there is an other solution because this command requires GStreamer and it’s quit heavy on my device.

  I have already ffmpeg on it maybe ffmpeg offers a solution for this.
  How can I do this redirection without Gstreamer ?

  Thank you,
  Antoine