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• wait for node server to start up in php

  22 février 2015, par Ortix92

  I have a php script which does the following :

  1. Start peerflix (node server)
  2. Get PID
  3. FFProbe* the server (http://127.0.0.1:8888)

  All of this is done in PHP but there is a slight issue. It seems that after having received the PID, the server is not fully initialized yet, or so it seems. The problem is that FFProbe cannot probe the server. In other words, it’s not accessible at the time of probing.

  What are some possibilities to probe the server when it is actually initialized ? I don’t want to use the arbitrary sleep() method because waiting for 2 seconds on a slow vagrant machine is now the same as waiting for 2 seconds on a blazing vast server.

  FFProbe throws an exception when it can’t probe the server. Perhaps use a try-catch and return back to the try if an exception is thrown ? How would I implement that ?

  *FFProbe is a companion of FFMpeg to get the information of a video file such as duration and codec.

• ffmpeg rtsp_transport to rtmp issues

  16 mars 2015, par RandomCouch

  I’m working on a project that requires taking rtsp links from youtube, and using ffmpeg to stream those videos to an rtmp server. My solution works, however it is having some issues.

  I’m using these settings :

   -max_delay 0 -initial_pause 0 -rtsp_transport udp -i " + inputLink + " -vcodec libx264 -acodec mp3 -ab 48k -bit_rate 450 -r 25 -s 640x480 -f flv "  + stream

  inputLink is replaced with the rtsp link, and stream is replaced with the rtmp server link

  So this works but here are the issues I’m having :

  • At the beginning of each video, there is a big lag spike/lots of frames dropped, and then the video resyncs and plays normally

  • Some videos would crash ffmpeg, with a "Conversion failed" message and many frames dropped during the conversion/stream.

  • At the end of each video it would start lagging/ dropping frame, right near the end of the video, in other words it doesn’t end normally, every video ends by lagging out / dropping frames

  I’ve been struggling for a long time just to get this working, and now I finally did, I just need to perfect it by taking care of those two issues, if anyone has useful information about the rtsp_transport protocol and how to make it stream with no issues, I would greatly appreciate it. Thanks !

• Revision 3606b78108 : Modified test for auto key frame detection. The existing test was triggering a

  16 avril 2015, par paulwilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_firstpass.c

  
  
  Modified test for auto key frame detection.

  The existing test was triggering a lot of false positives on some types
  of animated material with very plain backgrounds. These were triggering
  code designed to catch key frames in letter box format clips.

  This patch tightens up the criteria and imposes a minimum requirement
  on the % blocks coded intra in the first pass and the ratio between the
  % coded intra and the modified inter % after discounting neutral (flat)
  blocks that are coded equally well either way.

  On a particular problem animation clip this change eliminated a large
  number of false positives including some cases where the old code
  selected kf several times in a row. Marginal false negatives are less
  damaging typically to compression and in the problem clip there are now
  a couple of cases where "visual" scene cuts are ignored because of well
  correlated content across the scene cut.

  Replaced some magic numbers related to this with #defines and added
  explanatory comments.

  Change-Id : Ia3d304ac60eb7e4323e3817eaf83b4752cd63ecf