[MPlayer-users] file sizes with and without B frames

[Arpi]

Hi,

> 	DaI thought using B frames would produce smaller files since B
> 	frames are smaller than I frames.
yes but P's are bigger if you use B too (larger diferences between P's)

> 	Encoding a ~8min movie segment with and without B frames produces
> 	files that are perhaps 1% different in size - is the correct or
> 	am I not running mencoder correctly?

> ... | mencoder -sws 2 -vop scale=480:480 \
>   -ovc lavc \
>   -lavcopts vcodec=mpeg4:vhq:vbitrate=1500:keyint=100:vpass=1  \

hmm? you use fixed bitrate - and filesize depends only on bitrate, so why
should it be different? quality and cpu usage will differ for IP and IPB,
but the file size won't unless you change bitrate...


A'rpi / Astral & ESP-team

--
Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu