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• Compiling custom FFMPEG for mp3/wav to flac conversion

  3 décembre 2019, par Arttu

  I need to compile ffmpeg from source for CentOS. The goal it to convert MP3 and WAV to FLAC. I tried to compile ffmpeg with this guide : https://trac.ffmpeg.org/wiki/CompilationGuide/Centos
  and it worked fine, but took approximately 20min and compiled a bunch unnecessary things, even thought I did not used next options as recommended in guide, but used :

  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  
  --prefix="/opt/tmg/ffmpeg_build" \
  
  --pkg-config-flags="--static" \
  
  --extra-cflags="-I/opt/tmg/ffmpeg_build/include" \
  
  --extra-ldflags="-L/opt/tmg/ffmpeg_build/lib" \
  
  --extra-libs=-lpthread \
  
  --extra-libs=-lm \
  
  --bindir="/opt/tmg/ffmpeg_build/bin" \
  
  --enable-gpl \
  
  --enable-libfreetype

  My question is what do I need for MP3 and WAV to FLAC and how do I compile just that part ?

  I found in configuration --disable-all option, but what do I have to enable ?

  Thanks in advance.

• FFmpeg MSVC Compilation stuck

  10 mai 2017, par Earinor

  For several days now I try to build the FFmpeg Libraries. I’m using Windows7 64 Bit and MSVC2010. I followed this guide : https://trac.ffmpeg.org/wiki/CompilationGuide/MSVC

  I got rid of a view errors and configure is working finally. But when I try make, it runs for like half an hour and then gets stuck. It won’t proceed, I kept it running over night and nothing happend. I also tried different compiler options but it gets stuck every time at the same point.

  ffv1dec.o_converted.c
  
  d:\cpplibraries\ffmpeg-master\libavcodec\get_bits.h(308) : warning C4101: 're_cache' : unreferenced local variable
  
  d:\cpplibraries\ffmpeg-master\libavcodec\golomb.h(360) : warning C4245: '=' : conversion from 'int' to 'unsigned int', signed/unsigned mismatch

  I also tried setting up a minGW64 Msys2 Environment but have the same issue there.
  I also tried another setup but when I get rid of some errors I always get stuck at the exact same position.

  The cl.exe is running and is using memory but nothing happens.

  I also get a ton of warnings like conversions from int to unsigned int, Makro redefinitions, etc.

  I have no idea where to look to fix this, so I would appreciate some help.

• 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 ?