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• ffmpeg fails in crontab running as root

  21 décembre 2020, par Steve Lloyd

  I am trying to convert a video from mov to mp4 from a crontab.

  


  /usr/bin/ffmpeg -y -nostdin -hide_banner -loglevel panic -i "/var/www/sample.mov" -vcodec h264 -acodec mp3 "/var/www/sample.mp4"


  


  When I run it from a terminal it works fine. From a crontab I get the following errors. I have already tried adding "export LD_LIBRARY_PATH=/usr/lib/ && /usr/bin/ffmpeg" without success. Any help would be appreciated.

  


  [h264_v4l2m2m @ 0x4e8290] Could not find a valid device
[h264_v4l2m2m @ 0x4e8290] can't configure decoder
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_v4l2m2m) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))
Error while opening decoder for input stream #0:0 : Permission denied


  


• Why pkg-config overrides 'prefix' with another default one ?

  12 janvier, par SteveH

  I have an issue in using pkg-config to link some libraries to a program. The problem is 'prefix' variable in each library pkg-config files (*.pc) are overridden with an unwanted directory leading to building the program could not find the library's header and lib files.

  



  Here, one of '*.pc' files, x264.pc :

  



  prefix=/e/x264/x64-windows-rel  
exec_prefix=${prefix}   
libdir=${exec_prefix}/lib   
includedir=${prefix}/include    
...


  



  I run this from MSYS2 terminal :

  



  pkg-config --cflags --debug x264


  



  This is some of the output it traced out :

  



  ...
 Parsing package file 'D:/msys64/usr/local/lib/pkgconfig\x264.pc'
 line>prefix=/e/x264/x64-windows-rel
 Variable declaration, 'prefix' overridden with 'D:/msys64/usr/local'
...


  



  Note that MSYS2 and pkg-config are updated to newest versions.

  



  Could anybody tell me why it happens and how to solve the issue without renaming 'prefix' to something else.?
Thanks.

  


• Meaning of TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows

  6 janvier 2016, par Nicholas Muir

  I am trying to compile Ffmpeg on Android using Cygwin and windows 7. I came across these two options for the lines below when using some tutorials to make a .sh file for the compile. I am new to this process and am trying to understand what exactly to do. Is the prebuilt/windows referring to the package to the download packages as in the options in the image below or is it referring to the operating system I am using.

  This was the first option I found :

  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64

  This is the second option I found :

  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64 

  This is the images of the package download options available on the Ffmpeg.org site that I thought it may be reffering to.

  

  Thanks for your help.