[FFmpeg-user] bitrates and limits

Carl Eugen Hoyos cehoyos at ag.or.at
Sat Jan 26 17:26:00 CET 2013

JULIAN GARDNER <joolzg <at> btinternet.com> writes:

> 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.

This does not look FFmpeg-related to me.

Carl Eugen

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