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• fftools/ffmpeg_mux : stop using filter_in_rescale_delta_last for streamcopy

  13 avril 2023, par Anton Khirnov

  fftools/ffmpeg_mux : stop using filter_in_rescale_delta_last for streamcopy
  That field was added to store timestamp conversion state for audio
  
  decoding code. Later it started being used by streamcopy as well, but
  
  that use is wrong because, for a given input stream, both decoding and
  
  an arbitrary number of streamcopies may be performed simultaneously.
  
  They would then all overwrite the same state variable.
  Store this state in MuxStream instead.
  This is the last use of InputStream in of_streamcopy(), so the ist
  
  parameter can now be removed.
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_mux.c
  • [DH] fftools/ffmpeg_mux.h

• FFMPEG "-to" option won't stop encoding at the implied time

  11 janvier 2018, par Saber Karimi

  I’m using ffmpeg to cut and covert a part of a long video but when using the "-to" option ffmpeg keeps encoding till the end of the video and wont stop.

  Here’s my command :

  ffmpeg -ss 00:22:59 -i input.mkv -to 00:23:15.5 -c:v libx264 -c:a aac output.mp4

  if i change to "-t" and enter my desired duration, problem goes away. but since i have a very long video and many tasks i need to use "-to" which is easier for me.

  Thanks in advance.

• How to programmatically start/stop FFMPEG stream transcoding

  10 décembre 2019, par Paul Wieland

  I have an ip webcam which provides an MJPEG stream. I can successfully transcode and save that stream with ffmpeg under OSX. The following gives me pretty much what I want :

  ffmpeg -f mjpeg -i "http://user:pass@10.0.1.200/nphMotionJpeg?Resolution=640x480&Quality=Standard" -b:v 1500k -vcodec libx264 /tmp/test.mp4

  That will start an FFMPEG session and begin saving the live stream to my test.mp4 file. pressing q will quit ffmpeg and save the file.

  I would like to programmatically start & stop the recording using a PHP or Bash shell script. I have tried the following :

  <?php
  
  
  
  $pid = pcntl_fork();
  
  
  
  if($pid == -1){
  
      die("could not fork"); 
  
  }elseif($pid){
  
      // we are the parent...
  
      print $pid.' started recording. waiting 10 seconds...';
  
      sleep(10); // Wait 10 seconds
  
  
  
      print_r(shell_exec("kill ".$pid)); // Kill the child recording process
  
  
  
      echo 'done';
  
      exit(); 
  
  }else{
  
      // we are the child process. call ffmpeg.
  
      exec('../lib/ffmpeg -f mjpeg -i "http://user:pass@10.0.1.200/nphMotionJpeg?Resolution=640x480&Quality=Standard" -b:v 1500k -vcodec libx264 /tmp/test.mp4');
  
  }

  But there are two problems :

  1. The ffmpeg process does not end/die (probably because its forked again)
  2. When I manually kill the ffmpeg process, the video file is not readable