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• Issue #3 when compiling Xuggler for Raspberry pi with liboil

  19 juillet 2014, par Ashish Sharma

  I am trying to compile Xuggler for Raspberry Pi(Running on Debian OS aka Raspbian),

  I followed the ’Basic Build Instructions’ available here for compiling Xuggler.

  After I successfully installed all the prerequisites and set the correct paths, I ran the following command :

  ant run-tests

  After sometime I am facing the following error and the ant build fails :

  scroll at the end of log to see the issue

      Incarcerated package configured: ../../../../../captive/liboil
  
  Incarcerating package ../../../../../captive/liboil to fake DESTDIR=/home/pi/Downloads/xuggle-xuggler/build/native/armv6l-unknown-linux-gnueabihf/captive/stage
  
  /bin/bash: -c: line 1: syntax error near unexpected token `;'
  
  /bin/bash: -c: line 1: `          case armv6l-unknown-linux-gnueabihf in; *mingw*|*cygwin*) export as_cv_unaligned_access=yes ;; esac \'
  
  make: *** [all-local] Error 1

  I tried correcting the mentioned shell script but to no avail,

  Please help, following is the shell script code :

  if [ "" = "1" ]; then
  
    CROSS="--host ${HOST_OS}"
  
    # needed for mingw32 cross-compile to work
  
    case $HOST_OS in
  
       *mingw*|*cygwin*)
  
      export as_cv_unaligned_access=yes
  
      ;;
  
    esac
  
  else
  
    CROSS=
  
  fi

• Combining audio file and image with ffmpeg in python

  6 octobre 2018, par Liam

  tl ;dr : how to use a bash ffmpeg command in python

  So I’m trying to take one JPEG image and an audio file as input and generate a video file of the same duration as the audio file (by stretching the still image for the whole duration).

  So, I found these :
  https://superuser.com/questions/1041816/combine-one-image-one-audio-file-to-make-one-video-using-ffmpeg

  So, I now have the code for the merging :
  ffmpeg -loop 1 -i image.jpg -i audio.wav -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest out.mp4

  Then I want to use that in python but unable to figure out how to port this to ffmpeg-python or ffpy.

  I found this : Combining an audio file with video file in python

  So, I tried the same thing as him :

  cmd = 'ffmpeg -loop 1 -i image.jpg -i message.mp3 -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest out.mp4'
  
  subprocess.check_output(cmd, shell=True) 
  
  subprocess.call(cmd, shell=True)

  But I got "returned non-zero exit status 1". So what did I do wrong ?

• Pipe FFMPEG MPEG-DASH livestream to AWS S3

  17 août 2019, par Alexander

  So I’m currently trying to livestream the rendering of a GPU-heavy video (renders about 1fps), encode it to a 30fps MPEG-DASH livestream and output this to AWS S3 so Shaka Player can display the live rendering.

  The first issue is that the livestream keeps looping, it doesn’t stop after the rendering for loop is done.

  I use a python script to pipe the output of the rendering to FFMPEG, and pipe the output of FFMPEG to the aws s3 cli like this :

  p1 = Popen(['ffmpeg', '-y', '-hwaccel', 'cuvid', '-f', 'image2pipe', '-r', '24', '-i', '-', '-c:v', 'h264_nvenc', '-b:v', '5M', '-f', 'dash', '-movflags', 'frag_keyframe+empty_moov', '-'], stdin=PIPE)#, shell=True) #'-method', 'PUT', 'https://example.s3.amazonaws.com/test1/test1.mpd'], stdin=PIPE)
  
  
  
  p2 = Popen(['aws', 's3', 'cp', '-', 's3://example/test1/test1.mpd'], stdin=p1.stdout)
  
  
  
  
  
  #The following commented aws s3 sync command uploads successfully to S3
  
  #but the issue here is that it stops after the syncing is done and its hacky
  
  #p1 = Popen(['ffmpeg', '-y', '-vsync', '0', '-hwaccel', 'cuvid', '-f', 'image2pipe', '-r', '24', '-i', '-', '-c:v', 'h264_nvenc', '-b:v', '5M', '-f', 'dash', '-movflags', 'frag_keyframe+empty_moov', 'test2.mpd'], stdin=PIPE)#, shell=True) #'-method', 'PUT', 'https://teststream.s3.amazonaws.com/test1/test1.mpd'], stdin=PIPE)
  
  #p2 = Popen(['aws', 's3', 'sync', '.', 's3://teststream/test1', '--exclude', '"*"', '--include', '"*.m4s"', '--include', '"*.mpd"'], stdin=PIPE)
  
  
  
  #pseudocode
  
  for ci,(content,contentName) in enumerate(content_loader):
  
      im = renderframe(content)
  
      im.save(p1.stdin, 'PNG')
  
  
  
  p1.stdin.close()
  
  p1.wait()
  
  p2.stdin.close()
  
  p2.wait()