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• How to start live streaming on Mac using FFMPEG ?

  3 août 2014, par Alexandra Chis

  I am working on a MAC OS X Lion 10.7.5.

  How to properly install FFMPEG ?

  What I did :

  ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"
  
  brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools

  and even (I think this should work, but it doesn’t)

  brew install ffmpeg

  Nothing works...I can’t list the inputs, I can’t start the streaming from the USB camera, I can’t do anything.

  ffmpeg -f video4linux2 -s 320x240 -i video="USB cam":audio="USB mic" -f oss -acodec libvorbis -vcodec libvpx -f webm http://localhost:1234/streaming

  The errors I get look like this :

  unknown input format 'video4linux'

  and the same happens for alsa, openal, vfwcap etc.

  So did anyone try live streaming with FFMPEG from MAC ?
  How to install FFMPEG so that is supports video4linux2 or v4l2 or any input format at all ? How to list the devices (USB webcams or integrated webcams) ?

• 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

• awkward behaviour in bash find-loop with ffmpeg

  25 avril 2018, par Alexander

  There is something weird going on when running following script with Docker.

  The dockerfile for this is :

  FROM debian:9
  
  WORKDIR /app
  
  RUN apt-get -y update && \
  
      apt-get -y install ffmpeg curl
  
  COPY . /app

  The script run.sh :

  #!/bin/bash
  
  find /pfs/in -maxdepth 1 -name "*.flac" -print0 | while IFS= read -r -d $'\0' inFile; do
  
      echo "\n##### Process '${inFile}' #####"
  
      ffmpeg -y -i ${inFile} -ar 16000 tmp.wav # use 16kHz - default for EML
  
  done

  Starting this, when mounting 3 files into the container :

  $ ls pfs/in/
  
  Testaudio16k_2.flac  Testaudio16k.flac  Testaudio16k.wav  TestSprache_Saetze.flac
  
  $ docker run --rm -t -v $(pwd)/pfs/in:/pfs/in test-img:latest /bin/bash run.sh

  I get an error on processing the second file : pfs/in/Testaudio16k_2.flac: No such file or directory. The leading / is missing. It is also missing in the preceeding echo. Indeed this happens every second file (if I put more than 3 files in that folder).

  Now coming to the counter example :
  If I comment out the ffmpeg line in the script, rebuild and run, The echo prints for every file the correct path.

  Does anybody have an idea about this ?
  Is it about the find or is the ffmpegdoing something weird ? Something completely different ?