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• php ffmpeg exec & shell_exec process stops after few seconds

  6 octobre 2019, par Salem

  I’m using PHP script file with simple html interface to control FFMPEG process start and stop from the browser , the script goal is start live streaming on my server that usually runs for hours without stop (using ffmpeg and nginx-rtmp )
  my script were working perfectly until I notice recently This is strange behaviors
  here is my php script variables

  $cast =" /usr/sbin/ffmpeg -loglevel 0 -thread_queue_size 32768 -re -i '".$src."' -i /var/www/example/logo.png -r 23.976 -strict -2 480x360 -aspect 16:9 -filter_complex 'overlay=x=(main_w-overlay_w)/2:y=(main_h-overlay_h)-23' -vcodec libx264 -x264opts colormatrix=bt709 -profile:v high444 4 -b:v 290k -maxrate 290k -bufsize 250k  -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0" -acodec libfdk_aac -profile:a aac_he_v2 -b:a 16k -map_metadata -1 -f flv  rtmp://localhost/hls/live 2>/dev/null >/dev/null  & " ; 
  
  $output =  shell_exec( $cast   )    ;

  It’s like FFMPEG process continue until original php process ( that call it ) die , at first I thought this issue with the sorce or ffmpeg command but I test the same command on the sell and it works perfectly .
  My suspicion are with on STDIO etc were not redirected right . even when I excute the same php script from the shell it’s do the same stops after few seconds .

  =Edit=

  Even when I tried to run ffmpeg from the command line and make it run on the background , I got same behavior the process stop after few seconds , ffmpeg continue running only if I wait for it output .

  Here my OS details :-

  DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"
  
  NAME="Ubuntu"
  
  VERSION="18.04.3 LTS (Bionic Beaver)"

• vc2enc : zero padding of the coefficient buffer

  17 décembre 2019, par Lynne

  vc2enc : zero padding of the coefficient buffer
  Wavelet types with large amounts of overreading/writing like 9_7 would
  
  write into the padding at high wavelet depths, which would remain and be
  
  read by the next frame's transform and quickly cause artifacts to appear
  
  for subsequent frames.
  
  This fix affects all frames encoded with a non-power-of-two width, with
  
  the artifacts varying between non-observable to very noticeable,
  
  depending on encoder settings, so reencoding is advisable.
  

  • [DH] libavcodec/vc2enc.c

• Serve media collection to an old iphone 3gs [on hold]

  25 février 2019, par Ale

  I’d like to serve a media collection, hosted in a home network, to an old iphone. I’m pretty much able to do this using apache web server, html, javascript, and jwplayer. But most of the media is in a format that the iphone doesn’t support and so I run into the problem of transcoding each movie I want to play but I would like it to happen on the fly to save time as well as be able to seek or fast forward to different parts of the movie. How can I go about doing this using the tools I already mention ? Php and ffmpeg are also welcome. Other tools are fine but please suggest open source if posible. I’m on a windows pc at this time. I’m sorry for not being too specific. I’m looking for a method or a different set of tools to point me in the right direction.

  Thanks in advance.