Recherche avancée

Sur d’autres sites (4972)

• What's the most elegant way to get the language codes from an MKV file with multiple audio tracks ?

  30 janvier 2017, par WackGet

  I need a way to get the language codes from MKV files which have multiple audio tracks.

  ffmpeg produces output which I could then filter using regular expressions but it doesn’t seem very elegant :

  $ ffmpeg -i file.mkv 2>&1 | grep Audio
  
  Stream #0:1(eng): Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s (default)
  
  Stream #0:2(nar): Audio: mp2, 48000 Hz, mono, s16, 64 kb/s (default)

  mediainfo has the ability to extract language information but in files with multiple tracks, it concatenates the codes into a single string :

  $ mediainfo file.mkv --inform="Audio;%Language%"  
  
  ennar

  Is there a tool or command which will return language codes for multiple tracks in a nicer way, or a tool which would let me specify a track number and return the language code for that track only ?

• FFMPEG Wrapping a raw video stream with OGG (or another wrapper)

  9 juillet 2014, par Cykon

  I’m building an application which takes in a rawvideo stream (piped in from an ffmpeg instance), manipulates and reads the raw video data, and pipes the output to another ffmpeg instance for encoding. Everything works great, however I’ve been trying to think of a solution which would allow audio to be sent into my program as well.

  The Ogg container seems to have a great C library, and it appears as if there has been some movement to add support for raw video https://wiki.xiph.org/OggRGB

  My plan was to pipe in a stream formatted for Ogg, use libogg to demux it, after parsing through the video data and manipulating it... use libogg again to encode and pipe out.

  Unfortunately, FFMPEG throws an "Unsupported codec id in stream 0" error when asked to output OGG with rawvideo.

  My test ffmpeg command is as follows :

  ffmpeg.exe -i fs0.mp4 -f ogg -c:v rawvideo -pix_fmt rgb24 -s 192x144 -

  Any solutions, or alternative solutions are welcome. As a side note, my program has the ability to take in multiple videos at once and outputs a combination of the inputs.

• rtmp : Follow Flash player numbering for channels.

  16 septembre 2013, par Josh Allmann

  rtmp : Follow Flash player numbering for channels.
  Channel 4 is typically used by the Flash player to transmit
  
  audio, channel 6 for video, and various stream-specific invokes
  
  get sent over channel 8, which is designated the source channel.
  This more closely matches the behavior of the Flash player,
  
  including the transmission of play requests over channel 8.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/rtmppkt.h
  • [DH] libavformat/rtmpproto.c