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• Add buffering to real time input stream with c++ ffmpeg

  7 octobre 2018, par Joel

  I am writing a c++ program in which I am handling a real time udp video stream with the ffmpeg library.

  The video input fps is 25 frames per second in avarage. The gap between two frames can be 10 , 20, 40 milliseconds, but sometimes it can be around 80 milliseconds.
  In those times, when the gap is around 80 milliseconds, the video seems choppy or stuck,

  When I open the same stream with the ffplay player(using the ffplay.exe), using a simple
  "ffplay.exe udp ://ip:port" command, the video has a little delay (around 50 millisends) with respect to the origin stream, but it runs much more smoothly.

  Can I set a buffering time or any minimal delay so that the delay between the frames will be much more steady, in my c++ program ?
  If so, how can I do this ?

  Thanks,
  Joel

• Using an IF-Statement inside a drawtext (FFMPEG)

  22 janvier 2020, par MonsterDruide1

  I’m currently trying to implement a timer on a video with FFMPEG, so it should start at 00.00 and start timing after a number of frames and stop timing again after a set amount of frames. So the timer should work like this :

  00:00 00:00 00.00 (start timing) 00.01 00.02 [...] 05.88 05.89 (stop timing) 05.89 05.89 05.89

  So far I’ve got the following as (minimal) command :

  ffmpeg -i input.mp4 
  
  -filter_complex "[0:v]drawtext=fontfile='C\\:font.ttf':
  
  text='%{eif\\:n/30\\:d\\:2}\\:%{eif\\:((mod(n,30))/30)*100\\:d\\:2}':
  
  fontcolor=black:fontsize=55:x=(1705.5-(text_w/2)):y=(1000.5-(text_h/2)),format=yuv420p" 
  
  -pix_fmt yuv420p -c:a copy out.mp4

  There is some more stuff inside of the filter_complex, so I can’t replace that with -vf or similar.

  Thanks for all of your help !

• Revision de6ecc5ac3 : Selective masking of split modes. Allow selective masking of individual split m

  4 octobre 2013, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
  
  Selective masking of split modes.

  Allow selective masking of individual split modes rather than
  just a single on / off flag.

  For speed 2 recovers the large speed loss seen for some derf
  clips in change Ie6bdfa0a370148dd60bd800961077f7e97e67dd4
  and a small quality gain.

  For speed 1 10 % speed increase observed locally on some derf clips
  for minimal quality change.

  Change-Id : If86191087b93cbc05351c26c60c7933e2149e485