On Thu, Feb 5, 2015 at 7:18 PM, Sareyka, Julian <[email protected]> wrote: > Hello all, > > I am trying to encode video for adaptive streaming and need CBR for that. So > I use the -b:v, -minrate, -maxrate, -bufsize settings. > But in the end I get a lower video bitrate as configured. With this command I > end up with 3200 kb/s instead of 3500 kb/s: > > ffmpeg -y -i 14d7077e-0822-4ab4-ba7f-822df1874936.mp4 -vf scale=1280:720 > -pix_fmt yuv420p -c:v libx264 -aspect 16:9 -profile:v high -level 3.2 -r 25 > -g 50 -keyint_min 50 -sc_threshold 0 -b:v 3500k -minrate 3500k -maxrate 3500k > -bufsize 7000k -c:a libfdk_aac -b:a 192k -ar 48k -ac 2 test.mp4
Playing the devil's advocate here: Does it really matter? :) The minrate setting should work, but it entirely depends on the bufsize. See also: http://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate I was getting 3500k exactly when setting the bufsize to 10000k. It's all a matter of how big the window for calculating the bit rate budget is. _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
