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• MKV Video Faster Plays Faster

  4 avril 2014, par Ankush

  I have C# program which screenshots 3 times per second & adds this to mkv ( VP8 ) video, set FPS to 3,encoded video works but plays faster, the total length of video player shows is wrong & while playing it doesn't plays smooth it jumps like from 1sec -> 3sec -> 5sec means instread of 1 -> 2 ->3..

  There is something wrong with pts value,

  if ( codecContext->coded_frame->pts != AV_NOPTS_VALUE )
  
  {
  
   packet.pts = av_rescale_q( packet.pts, codecContext->time_base, pVideoStream->time_base );
  
  }
  
  
  
  if ( codecContext->coded_frame->pkt_dts != AV_NOPTS_VALUE )
  
  {
  
   packet.dts = av_rescale_q( packet.dts, codecContext->time_base, pVideoStream->time_base );
  
  }

  while debugging codecContext->time_base shows 3FPS ( num=1 den=3 ) & pVideoStream->time_base shows ( num=1 den=1000) & packet.pts & packet.dts shows 0 ( everytime )

  Whats wrong ? Anyone please give me some hint atleast.

• Displaying ffmpeg conversion progress

  29 mars 2014, par Hiigaran

  I'm trying to get an admin function made, in which I want to show a basic status of any file conversion(s) that may or may not be happening upon page load. I'm not entirely sure how to proceed with this, so here is what I have at the moment :

  exec("ffprobe -v quiet -print_format json -show_format '".$fileNameIn.".".$ext."' > /var/www/resources/ffmpegFormat.log");
  
  exec("/ffmpeg/ffmpeg -loglevel 'verbose' -i '".$fileNameIn.".".$ext."' '".$fileNameOut.".flac' null >/dev/null 2>/var/www/resources/ffmpeg.log &",$ffmpegOutput);

  My idea is to use ffprobe to output some information about the file to be converted, then use PHP in some way to read the output file (ffmpegFormat.log) for the total file duration. Once read, ffmpeg begins, while outputting to its own file (ffmpeg.log).

  I'm not looking for anything fancy, like live updates on the progress, so I'm content with simply having a script read the current duration from the last line of the ffmpeg.log file, compare it to the total duration from the ffmpegFormat.log file, and display a percentage only after a page load/refresh.

  I've placed a restriction on conversion to only one file at a time, for the sake of simplifying this progress indicator (and due to a lack of processing power on this computer).

  Assuming there's no simpler way than my idea, how can I do this ?

• Broadcast Unity camera to web

  19 juillet 2019, par Nick

  I want to do a test, where I can Live stream the Camera view from a Unity project, to the web. If I understand correctly, I’ll need to use FFMpeg with pipe out, from Unity ? and then then somehow read it from NodeJS and serve/stream it to the web ?? I’m not really sure how to even approach it.

  Any help would be really appreciated.

  Nick

  PS : Assume I’m a total noob in your suggestions please ! hahah

  Edit : I’m total noob when it comes to FFmpeg and which components that how it is expected to be connected. Like, "you need to make unity to do that, and then take that output and blah blah blah", if that makes sense