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• Merge mp3 files using FFmpeg on Android

  13 mai 2017, par Ali

  I am trying to merge two mp3 files using this command :

  ffmpeg -i "concat:/storage/emulated/0/Recordings/oneone.mp3|/storage/emulated/0/Recordings/twone.mp3" -c copy /storage/emulated/0/Recordings/concated.mp3

  but get this error :

  "concat:/storage/emulated/0/Recordings/oneone.mp3|/storage/emulated/0/Recordings/twone.mp3": No such file or directory

  Even though the both files exist in the directory. I have written this command according to the documentation : https://trac.ffmpeg.org/wiki/Concatenate#protocol

  How do I fix this ? Please help me.

• FFmpeg WebM AV1 Support

  6 septembre 2018, par Matt McManis

  With FFmpeg how can I use AV1 codec in a webm container ?

  I get the error :

  Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output stream 0:0 --

  ---

  However Wikipedia says WebM supports AV1.

  https://en.wikipedia.org/wiki/AV1

  AV1 is intended to be able to be used together with the audio format Opus in a future version of the WebM container format for HTML5 web video

  Or can FFmpeg simply not encode this new version ?

  ---

  My settings :

  ffmpeg -y 
  
  
  
  -i "C:\Users\Matt\video.mp4" 
  
  
  
  -c:v libaom-av1 -strict experimental 
  
  -cpu-used 1 -crf 28 
  
  -pix_fmt yuv420p 
  
  -map 0:v:0? -map_chapters -1 
  
  -sn 
  
  
  
  -c:a libopus 
  
  -map 0:a:0? 
  
  
  
  -map_metadata 0 
  
  
  
  -f webm 
  
  
  
  -threads 0 
  
  
  
  "C:\Users\Matt\video.webm"

• Compiling custom FFMPEG

  25 novembre 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.