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• ffmpeg : capture two screens simultaneously, save as two separate files

  9 janvier 2017, par wetjosh

  Is this possible ? Here is my working single file solution. How can I modify it to save two separate files instead ?

  ffmpeg \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 1 \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 2 \
  
  -pix_fmt yuv420p -r 30 -preset ultrafast -b:v 5000k -t 15 \
  
    -filter_complex \
  
      "nullsrc=size=2880x900 [background]; \
  
      [0:v] setpts=PTS-STARTPTS, scale=1440x900 [left]; \
  
      [1:v] setpts=PTS-STARTPTS, scale=1440x900 [right]; \
  
      [background][left] overlay=shortest=1 [background+left]; \
  
      [background+left][right] overlay=shortest=1:x=1440 [left+right]" \
  
    -map [left+right] out.mov

  I’ve tried removing the filter complex. I’ve tried adding two output files. I’ve tried various combinations of mapping. The following is the closest I’ve gotten to making it work. It creates two files, but both contain only the second stream (-i 2).

  ffmpeg \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 1 \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 2 \
  
  -pix_fmt yuv420p -r 30 -preset ultrafast -b:v 5000k -t 15 out1.mov \
  
  -pix_fmt yuv420p -r 30 -preset ultrafast -b:v 5000k -t 15 out2.mov

• Trouble installing ffmpegthumbnailer on Amazon Linux AMI

  30 août 2014, par jnbankston

  I am trying to install ffmpegthumbnailer on a Ec2 instance using Amazon linux. Ffmpeg has been compiled successfully and is working.

  This is my configuration when compiling from source
  ./configure —prefix=/tmp/ffmpegthumbnailer_dir/ —enable-shared —enable-png —enable-jpeg —enable-static —with-pic PKG_CONFIG_PATH=/root/ffmpeg_build/lib/pkgconfig/

  This is the error when I try to make the binary.

  /usr/bin/ld : /root/ffmpeg_build/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
/root/ffmpeg_build/lib/libavformat.a: could not read symbols: Bad value
collect2: error: ld returned 1 exit status
make[2]: *** [libffmpegthumbnailer.la] Error 1
make[2]: Leaving directory

  /tmp/ffmpegthumbnailer_dir’
  make[1] : * [all-recursive] Error 1
  make[1] : Leaving directory `/tmp/ffmpegthumbnailer_dir’
  make : * [all] Error 2

• How to run FFMPEG with —enable-libfontconfig on Amazon Linux 2

  22 avril 2024, par Adrien Kaczmarek

  Problem

  


  I want to run FFmpeg on AWS Lambda (Amazon Linux 2) with the configuration --enable-libfontconfig enable.

  


  Situation

  


  I already have FFmpeg running on AWS Lambda without the configuration --enable-libfontconfig.

  


  Here is the step I took to run FFmpeg on AWS Lambda (see official guide) :

  


  

  • Connect to Amazon EC2 running on AL2 (environment used by Lambda for Python 3.11)

  


  • Download and package FFmpeg from John Van Sickle

  


  • Create a Lambda Layer with FFmpeg

  


  


  Unfortunately, the version built by John Van Sickle doesn't have the configuration --enable-libfontconfig enabled.

  


  Unsuccessful Trials

  


  I tried to rebuilt it from scratch following the installation guide but without success (and the guide doesn't install font related dependencies)

  


  I tried to install it with brew but the command brew install ffmpeg didn't succeed on AL2.

  


  I tried to install ffmpeg from ffmpeg-master-latest-linux64-gpl.tar.xz. Unfortunately, this build of ffmpeg doesn't run on AL2 :

  


  ffmpeg: /lib64/libm.so.6: version `GLIBC_2.27' not found (required by ffmpeg)
ffmpeg: /lib64/libpthread.so.0: version `GLIBC_2.28' not found (required by ffmpeg)
ffmpeg: /lib64/libc.so.6: version `GLIBC_2.27' not found (required by ffmpeg)
ffmpeg: /lib64/libc.so.6: version `GLIBC_2.28' not found (required by ffmpeg)


  


  Any help would be greatly appreciated,

  


  Please make sure your answer is up to date and tested. Too many answers out there are auto-generated, too generic, or simple redirect without context.

  


  Thank you