[FFmpeg-user] bitrates and limits

JULIAN GARDNER joolzg at btinternet.com
Sat Jan 26 16:42:09 CET 2013

Ive been playnig around with "Bitrate viewer" on a few files ive converted and noticed something which i thought shoud not be there.

I encoded a file with

ffmpeg -threads 0 -i xxx.avi -vcodec libx264 -preset superfast -x264opts keyint=75 -s 720x288 
-bufsize 1M -r 25 -b:v 600k -bt 200k -maxrate 900k -acodec libfaac -ab 
96k -ar 48k -ac 2 -async 1 -y -f mpegts xxx.ts

Now i was expecting the final bitrate to be under 1000k, but using the viewer i have a min of 38k and a max of 1500k, average is 838k.

So what have i missed in keeping the rate under 1000k? or is bitrate viewer wrong?


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