[Ffmpeg-devel] [BUG] Crash when providing -coder ac parameter

Limin Wang lance.lmwang
Sat Mar 31 02:28:44 CEST 2007


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Hi,

> >The problem is everything is fine in the eye of the user, but in fact, 
> >it'll
> >hide the fact that -coder ac haven't let ffmpeg user ac coder as user's
> >expecting.
> Weird. Are you sure? I tried encoding using both "-coder ac" and "-coder 
> vlc" and it resulted in a different file size and different performance 
> (and as expected AC resulted in a smaller file size and encoding was 
> noticeably slower).

> The difference in filesizes when using the lossless ffv1 codec:
> Coder    Filesize
> VLC      19923786
> AC       19290550

At least, -coder expect <int> parameter, so you'll get unknown result. I'm
testing h264 encode only.

./ffmpeg -i /usr/local/movies/sample_h264_1mbit.mp4 -pass 1 -coder ac -vcodec
mpeg2video /tmp/1.h264

#head -n 1 x264_2pass.log
#options: 352x288 fps=25/1 cabac=0 ref=1 deblock=0:0:0 analyse=0x1:0x130
me=dia subme=7 brdo=0 mixed_ref=0 me_range=4 chroma_me=0 trellis=0 8x8dct=0
cqm=0 deadzone=21,11 chroma_qp_offset=0 threads=1 nr=0 decimate=1 mbaff=0
bframes=0 keyint=12 keyint_min=7 scenecut=0 rc=abr bitrate=200 ratetol=20.0
rceq='tex^qComp' qcomp=0.50 qpmin=2 qpmax=31 qpstep=3 ip_ratio=1.25


Thanks,
Limin
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