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• How to use the —abr-ladder from x265 on ffmpeg

  14 septembre 2020, par Diego

  I'm trying to find out how to use the latest x265 abr-ladder option on ffmpeg, which promises up to 65% time savings compared to sequential generation, according to release notes, but : (1) I'm not sure if it is already available on ffmpeg or how to find out, and if it is (2) specifying the input/output inside the configuration file instead of the ffmpeg CLI causes ffmpeg to complain that required parameters are missing.

  


  In the x265 repository there is a example for configuration file, but I couldn't find there or in the ffmpeg repository instructions on how to use this kind of parameter that doesn't seem to follow the CLI standards for ffmpeg. Apparently it is possible to create multiple outputs in a single command using ffmpeg, but again I couldn't make it work.

  


  So what I'm looking for is a usage example for the --abr-ladder parameter for x265. Thank you.

  


• Data URI or Base64 string as input to ffmpeg command

  18 août 2022, par Alok

  I can easily convert my media from one format to other using ffmpeg
  
ffmpeg -i input_file.ogg -acodec flac output_file.flac

  


  In place of input file I want to use Data URI or Base64 string as input file. I saw one example
  
ffmpeg -i "data:image/gif;base64,R0lGODdhCAAIAMIEAAAAAAAA//8AAP//AP///////////////ywAAAAACAAIAAADF0gEDLojDgdGiJdJqUX02iB4E8Q9jUMkADs=" smiley.png given at https://ffmpeg.org/ffmpeg-all.html

  


  I tried this example for my audio conversion.
  
ffmpeg -i "data:audio/ogg; codecs=opus;base64,GkXfo59ChoEBQveBAULygQR...trimmed" -acodec flac /tmp/alok.flac

  


  When I run script having this command I see error
  
./ffmpeg.sh: line 1: /usr/bin/ffmpeg: Argument list too long

  


  How can I make this conversion work ? How can I use Base64 data as input to ffmpeg command ?

  


• Linking VLC build to ffmpeg build libraries

  14 mars 2017, par gatorface

  I’m receiving the following error message when attempting to build VLC :

  checking for mad_bit_init in -lmad... yes
checking for MPG123... yes
checking for libavutil variant... libav
checking for GST_APP... yes
checking for GST_VIDEO... yes
checking for AVCODEC... no
configure: error: Requested 'libavcodec >= 57.16.0' but version of libavcodec is 56.1.0. Pass --disable-avcodec to ignore this error.

  I am running the command (first step of Configuration from link below, I did the contrib method and built everything else as well) :

  ./configure

  So let’s get the obvious out of the way : I’m missing the most recent version of libavcodec (v57). Using --disable-avcodec is not a viable solution. Doing a quick apt-file search libavcodec I’m seeing that for debian/jessie the latest version published is libavcodec56, not 57. I did also notice that libavcodec57 was available for installation with ffmpeg here https://ffmpeg.org/download.html

  I actually needed to also build ffmpeg from source. So I did that, worked my way through the dependencies without too much trouble using the guide linked to below.

  So here is my issue : After building and doing a make install of ffmpeg, I still get that error above, despite having the latest libavcodec freshly compiled.

  So my question is : since I used that guide, I am still getting the error when building vlc. I see that the lib exists her : /root/ffmpeg_build/lib/libavcodec.a, and I figured make install would put it where it needs to be. Is there some other compile flag I can set while compiling vlc to point it to that lib directory to look for libavcodec ?

  ffmpeg build : https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
  vlc build : https://wiki.videolan.org/UnixCompile/

  ---

  UPDATE : tried this, still getting the error message : PKG_CONFIG_PATH="/root/ffmpeg_build/lib:$PKG_CONFIG_PATH" LD_LIBRARY_PATH="/root/ffmpeg_build/lib:$LD_LIBRARY_PATH" ./configure

  ---

  UPDATE2 : tried this, still getting the error message : ./configure --libdir="/root/ffmpeg_build/lib:$LIBDIR"

  ---

  UPDATE3 : I tried merging my ffmpeg libs into my vlc libs and may have made things worse. My ffmpeg libs lived here : /root/ffmpeg_build/lib
  My vlc build (contrib builds as well) lived here : /opt/vlc/

  So I merged them with my existing vlc contrib lib :

  cp /root/ffmpeg_build/lib/* /opt/vlc/contrib/x86_64-linux-gnu/lib/
cp /root/ffmpeg_build/lib/pkgconfig/* /opt/vlc/contrib/x86_64-linux-gnu/lib/pkgconfig/

  Then ran configure :
  ./configure --with-contrib=contrib/x86_64-linux-gnu

  Which finally worked, but now I get this error when I try to make :

  Now I get the error :
  /usr/bin/ld: /opt/vlc/contrib/x86_64-linux-gnu/lib/libavformat.a(allformats.o): relocation R_X86_64_32 against `ff_a64_muxer' can not be used when making a shared object; recompile with -fPIC