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• PHP : Return response immediately, but run multiple lengthy shell_exec functions in the background

  15 janvier 2016, par Jake

  I am creating a simple web service that accepts a video upload, runs multiple different encodes on the video (mp4, webm, ogv), and then uploads the newly created files to our video host.

  Let’s say I have multiple commands..

  shell_exec('ffmpeg -i input.mp4 -f mp4 -c:v libx264 -preset slow -crf 24 -s 1280x720 -c:a libfdk_aac -profile:a aac_he -ar 22050 -b:a 64k -movflags +faststart output-1280x720.mp4');
  
  
  
  shell_exec('ffmpeg -i input.mp4 -f mp4 -c:v libx264 -preset slow -crf 24 -s 1920x1080 -c:a libfdk_aac -profile:a aac_he -ar 22050 -b:a 64k -movflags +faststart output-1920x1080.mp4');
  
  
  
  shell_exec('ffmpeg -i input.mp4 -f ogg -c:v libtheora -q:v 5 -s 1280x720 -c:a libvorbis -ar 22050 -b:a 64k -movflags +faststart output-1280x720.ogv');
  
  
  
  shell_exec('ffmpeg -i input.mp4 -f ogg -c:v libtheora -q:v 5 -s 1920x1080 -c:a libvorbis -ar 22050 -b:a 64k -movflags +faststart output-1920x1080.ogv');

  In summary, I want to...

  1. Print an immediate response : success : true
  2. Kick off multiple ffmpeg jobs synchronously.
  3. After each job is complete, send a POST to another server (one POST for each shell_exec).

  It would also be nice to only send the POST if the job was successful, but I could easily work around that by just checking to see if the output file exists on the server.

  I know that I can force shell_exec to run in the background by simply appending >/dev/null 2>/dev/null & to each command — which would allow me to print a response immediately — but I think by doing this, this would cause all of the jobs to run in parallel, and also, since this is diverting the output, I do not get any true callbacks when jobs are complete.

  Any ideas ??

• ffmpeg overlay voice on a song with fade in and fade out

  22 octobre 2016, par Mehmed

  I have a fade in and fade out problem and used below code, but not completely resolve.
  I have a voice as voice.mp3 name with voice_length seconds length and a song that biggest from voice.
  I want mix with song from start_mix_time time.
  When voice start volume should be 0.2 and when voice end, volume return to 1.0.

  For example, if i have a voice by 10 s length and a song, song start playing and at position 3 s, starting to fade out to vol 0.2 and then, at 5 s, voice start over song and after 10 seconds, song fade in to vol 1 and play to end.

  Here is a sample :

  ffmpeg -i song1.mp3 -i voice2.mp3  -filter_complex "[0]asplit[a][b]; \
  
          [a]atrim=duration=voice_length,volume='1-max(0.25*(t-start_mix_time-2),0)':eval=frame[pre]; \
  
          [b]atrim=start=start_mix_time,asetpts=PTS-STARTPTS[song]; [song][1]amix=inputs=2:duration=first:dropout_transition=2[post]; \
  
          [pre][post]concat=n=2:v=0:a=1[mixed]" \
  
          -map "[mixed]" output.mp3

  @Mulvya

• Grafika and OpenGL to record a video on android in square shape

  3 octobre 2015, par Cédric Portmann

  I am currently trying to record a video in square shape and create a output as .mp4. It seems to be really challenging. I tried diffrent approches including : OnPreviewFrame and FFMpeg. But never got a satisfing result. Today i found Grafika. And it seems to be the right way. But because of the complextity of the Code i am stuck now. Using the Example : CameraCaptureActivity.java i managed to record a video. But its shape is rectangluar and not square. Furthermore the camera is rotated by 90 degrees. I was already trying to manipulate certain parameters but never got a good video. Some where squeezed and so on.

  Does anybody know what parameters i need to change inside Grafikas example to get the right result ?
  In the end the camera of my android phone should record Videos like Vine or Instagram.

  Thanks for your help !