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• Using ffmpeg to encode web dash and audio drift

  1er octobre 2016, par John Joske

  I’m trying to use ffmpeg to create webm-dash encoded files from a usb web cam. Adapted from this example http://wiki.webmproject.org/adaptive-streaming/instructions-to-do-webm-live-streaming-via-dash

  I have managed to get something nearly works with the following command :

  ffmpeg -f video4linux2 -framerate 30 -s 640x360 -i /dev/video0
  -thread_queue_size 512 -f alsa -ar 44100 -ac 2 -i hw:2 -map 0:0 -pix_fmt yuv420p -c:v libvpx-vp9 -s 640x360 -keyint_min 60 -g 60 -speed 6 -tile-columns 4 -frame-parallel
  1 -threads 8 -static-thresh 0 -max-intra-rate 300 -deadline realtime
  -lag-in-frames 0 -error-resilient 1 -f webm_chunk -header video_360.hdr" -chunk_start_index 1 video_360_%d.chk -map 1:0 -c:a libvorbis -b:a 128k -ar 44100
  -f webm_chunk -copytb 1 -audio_chunk_duration 2000 -header video_171.hdr -chunk_start_index 1 video_171_%d.chk

  However over a period of time the audio chunks slowly get behind the video chunks, can anyone suggest a way to ensure they stay the same.

• can't install libvorbis on centos 7, fatal error : ogg/ogg.h : No such file or directory

  14 octobre 2019, par Abdalla Mohamed Aly Ibrahim

  Hello I’ve been trying to install FFmpeg with some libraries using this tutorial
  https://trac.ffmpeg.org/wiki/CompilationGuide/Centos?version=85

  using this command to install the libvorbis

  cd ~/ffmpeg_sources
  
  curl -O -L http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.5.tar.gz
  
  tar xzvf libvorbis-1.3.5.tar.gz
  
  cd libvorbis-1.3.5
  
  ./configure --prefix="$HOME/ffmpeg_build" --with-ogg="$HOME/ffmpeg_build" --disable-shared
  
  make
  
  make install

  i get this error with command make

      ../include/vorbis/codec.h:26:21: fatal error: ogg/ogg.h: No such file or directory
  
       #include <ogg></ogg>ogg.h>
  
  compilation terminated.

  and when i install ffmpeg i get this error

  ERROR: vorbis not found using pkg-config

  Thanks

• Is there a way to integrate FFmpeg into own C#-Solution using Visual Studio ?

  17 avril 2023, par stupidbutseeking

  I can't figure out how to use FFmpeg in my own C#-Project.
I downloaded the win64 gpl shared release with the libs from https://github.com/BtbN/FFmpeg-Builds/releases but I can't find a way to integrate it into my existing Visual Studio Solution.

  


  I also tried to compile the libs following this guide : https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT for win x64
and also this https://github.com/microsoft/FFmpegInterop
but none worked.

  


  When I reference the dlls (using the Dependency-Manager from VS) it will complain that the references are invalid or not supported.

  


  I also created a new VS Project but the same problem occured. I read in some forum that the target framework has to be netstandard2.0.

  


  I think I missed something but I cant find out what it is.