[MPlayer-users] xvid, mencoder and bframes

[Palumbo Daniele]

hi
i have found that error
xvid: cannot use bframes with 2-pass, disabling bframes

with command
-xvidencopts pass=2:bitrate=979:me_quality=6:quant_range=2-6/2-16:mod_quant:min_key_interval=1:max_key_interval=250:max_bframes=2:bquant_ratio=150:bquant_offset=100:bf_threshold=0:chroma_me:4mv:divx5bvop:vhq=0

so i searched for that code...
and i found it in libmpcodecs/ve_xvid.c line 225-229 in CVS of 15/11/2003.

#ifdef XVID_API_UNSTABLE
    if (xvidenc_max_bframes >= 1 && xvidenc_pass >= 1) {
        mp_msg(MSGT_MENCODER,MSGL_WARN, "xvid: cannot use bframes with 2-pass, disabling bframes\n");
        xvidenc_max_bframes = 0;
    }

now, a simple question: why?
why bframes can't be used with dev version of xvid?

thanks
bye
daniele