Recherche avancée

Sur d’autres sites (10861)

• A Digital Media Primer for Geeks

  24 septembre 2010, par noreply@blogger.com (John Luther)

  Our friend Monty Montgomery (creator of the Vorbis audio codec used in WebM) has started a video series about digital media. The first episode is an excellent overview of "the technical foundations of modern digital media."

  You can stream WebM versions of the video in your favorite WebM-enabled browser or download it to your desktop and watch it one of many WebM-enabled media players. Supported browsers and players are listed on our site.

  There’s also a companion Wiki.

  

• 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.

• FFMPEG Video Encode Single Input Multi Output

  1er août 2014, par ShyamKG

  I have a custom video encoder filter which can produce upto 5 different bitrates for the same resolution.

  Note that single instance of the encoder is optimized for producing these multiple outputs. Every encode call returns 5 output buffers.
  This means that I would not want to run more than one encoder instance.

  I need to integrate this encoder to FFMPEG which should give multiple outputs for a single input. I have referred the following link regarding creating multiple outputs.
  https://trac.ffmpeg.org/wiki/Creating%20multiple%20outputs

  In this link multiple outputs are created by running multiple encoder instances which is not my requirement.

  Is there any way by which we can configure ffmpeg to give multiple output for one encoder instance ?