Hi, I regularly cut videos using ffmpeg, where I have two inputs: One camera recording FHD@50 and one screen recording recording some format slightly smaller than FHD and with a variable frame rate, averaging to something between 20 and 25 fps usually.
I then take a black FHD canvas at 50 fps, overlay the screen recording on top, aligned to the left side, so there is a small black border on the right. The camera should sometimes be fullscreen and sometimes be in the top right corner, so I use a commands file that sends the correct values for the scale filter, and overlay that on top of the previous overlays. My filter chain would look something like this: [0]fps=50,sendcmd=f=camera.cmd,scale@cam[camera]; color=c=black:size=1920x1080,fps=50[background]; [1]fps=50,setpts=PTS+$screen_offset/TB[screen_tmp]; [background][screen_tmp]overlay=x=0:y=0:shortest=1[screen]; [screen][camera]overlay=x=W-w:y=0:repeatlast=0[video] I even insert fps=50 commands everywhere to assure that ffmpeg doesn't default to 25fps which has happened to me before. Unfortunately, this command regularly gets killed by my kernel due to excessive RAM usage. It usually happens a few minutes after the screen recording starts. When I preprocess the screen recording using -vf fps=50 filter, i.e. transform it into a fixed frame rate video, before passing it to the above filters, everything works as expected. Am I doing something wrong? Is it possible to avoid re-encoding the input before doing the actual encoding, without getting my kernel upset? Thanks, Dominic _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
