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• shell_exec not working with ffmpeg

  29 janvier 2017, par Alteras

  On my website, you are allowed to upload videos. I’m trying to get thumbnails for these videos, and the ffmpeg-php package didn’t want to work. Due to this, I’ve decided that I’d just shell_exec my command, but it’s not working. Due to the same command working via SSH, but not with the code, I’ve narrowed it down to me not being a root user.

  $ffmpeg = '/root/bin/ffmpeg';
  
  $size = '120x90';
  
  $thumbnail_dir = '/var/www/domain.com/public_html/uploads/videos/thumbnails/'.$filename.'.jpg';
  
  $cmd_2 = 'sudo $ffmpeg -i $ffmpeg_dir -an -ss 2 -frames:v 1 -update 1 -s 200x200 $thumbnail_dir';
  
  shell_exec($cmd_2);

  I’ve echoed out the value of $cmd_2 and tried it via SSH and it worked just fine, but for some reason the thumbnail isn’t being created if I just use shell_exec.

  I was wondering if there’s any way to force this to run as root, or any way to do this differently so it will work.

• Output video segments via a pipe using FFmpeg

  6 janvier 2019, par Joey Morani

  My Node.js app uses FFmpeg to capture video of a DirectShow device and then output segments for live streaming (HLS). At the moment I’m outputting the segments to files, however if I could output them via a pipe it would allow me to efficiently send the segment via a websocket instead of hosting a HTTP server.

  I’ve tried using this command :

  ffmpeg -y -f dshow -i video=FFsource:audio=Stereo Mix (Realtek High
  Definition Audio) -vcodec libvpx -acodec libvorbis -threads 0 -b:v
  3300k -cpu-used 5 -keyint_min 150 -g 150 -map 0 -flags:v
  +global_header -f segment -

  However it gives the error "Could not write header for output file #0 (incorrect codec parameters ?) : Muxer not found". This commands works for outputting to files (by replacing ’-’ with ’seg_%03d.webm’).

  Does FFmpeg not support pipes for segmented video, or is there something wrong with the command ? Thanks.

• Output video segments via a pipe using FFmpeg

  13 mai 2014, par Joey Morani

  My Node.js app uses FFmpeg to capture video of a DirectShow device and then output segments for live streaming (HLS). At the moment I’m outputting the segments to files, however if I could output them via a pipe it would allow me to efficiently send the segment via a websocket instead of hosting a HTTP server.

  I’ve tried using this command :

  ffmpeg -y -f dshow -i video=FFsource:audio=Stereo Mix (Realtek High
  Definition Audio) -vcodec libvpx -acodec libvorbis -threads 0 -b:v
  3300k -cpu-used 5 -keyint_min 150 -g 150 -map 0 -flags:v
  +global_header -f segment -

  However it gives the error "Could not write header for output file #0 (incorrect codec parameters ?) : Muxer not found". This commands works for outputting to files (by replacing ’-’ with ’seg_%03d.webm’).

  Does FFmpeg not support pipes for segmented video, or is there something wrong with the command ? Thanks.