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• ffmpeg latency even on 127.0.0.1 udp

  3 juin 2016, par KKKk

  I’ve got a problem with ffmpeg video stream(udp). Thing is I’ve got about 2 sec delay on live stream even on loopback(!).

  I use those parameters :

  ffmpeg -f dshow -i video="screen-capture-recorder" -vcodec libx264 -preset ultrafast -tune zerolatency -r 10 -maxrate 750k -bufsize 3000k -f mpegts udp://127.0.0.1:1234

  I tried also those :

  ffmpeg -f dshow -i video="screen-capture-recorder" -framerate 30 -c:v libx264 -preset veryfast -tune zerolatency -pix_fmt yuv444p -x264opts crf=20:vbv-maxrate=3000:vbv-bufsize=100:intra-refresh=1:slice-max-size=1500:keyint=30:ref=1 -f mpegts udp://127.0.0.1:1234

  but it’s even worse.
  I tried to raise framerate, or decrease GOP value, but it didn’t help me. Any ideas ? Maybe I did some basic mistakes since I’m beginner yet..
  (probesize at 32 didn’t help me too).

• ffmper with vlc - too heavy screen grabbing, resulting injumpy file, frame loss

  15 mai 2016, par OGP

  I’m using ’vlc/ffmpeg’ package to grab the screen and convert it to H.264 file.

  The problem arises when the host is heavily loaded. I need to maintain correct time stamps and use the 5 fps (relatively low frame rate). Yet sometimes the resulting file jumps few seconds forward, apparently due to frame loss.
  I can deal with the frame loss, it’s OK, but I need to duplicate lost frames to maintain correct timing.

  My configuration file :

  vlc.exe screen :// -I dummy —verbose=2 —one-instance :screen-fps=5 :screen-caching=10000 :sout=#transcodevenc=x264preset=ultrafast,tune=zerolatency,vcodec=h264,fps=5,vb=3000,width=1024,height=576,acodec=none:filedst="C :\tmp\output.mp4"

  What should I add/config to preserve proper time stamps and clip duration ?

  Many thanks for your help.

• ffmpage win7 screen record cursor is not normal

  5 avril 2017, par Wesley

  I hit a problem when recording screen on window 7 using ffmpeg.

  Snapshot here :
  

  So, you guys see the big red point is recorded mouse cursor.
  I am using PPT default pencil, so, actually, cursor is a very small point.
  But it becomes so big when play.

  Command I use :

  ffmpeg.exe -y -rtbufsize 500M -f gdigrab -framerate 5  -draw_mouse 1 -i desktop -f dshow -i audio=%s -af "highpass=f=200, lowpass=f=3000" -c:v libx264 -r 5 -preset medium -tune zerolatency -crf 35 -pix_fmt yuv420p -c:a libvo_aacenc -ac 2 -b:a 48k  -fs 50M  -movflags +faststart

  Anyone hit this before ?

  Thanks.

  Wesley