[Ffmpeg-devel] Re: Differences between mencoder and ffmpegwhenencoding using x264
Bob Pankratz
rpankratz
Wed Mar 15 07:40:49 CET 2006
Erik Slagter <erik <at> slagter.name> writes:
>
> On Mon, 2006-02-20 at 22:02 +0100, Erik Slagter wrote:
> > > diff -u, please
> > FWIW, here the diff -u:
>
> Now we're on it, I think this reads even better
(I hope this aligns using monospace font)
>
> ffmpeg mencoder
>
> cabac=0 cabac=1
> ref=1 ref=1
> deblock=0:0:0 deblock=1:0:0
> analyse=0x1:0 analyse=0x1:0x111
<snip>
In the same spirit we've been trying to adapt a recipe
for using ffmpeg to transcode videos to h.264 for
iPod users. We've got optimal settings for 1-pass
using native x264->ipod done. Given the speed and
direct to mp4 feature from ffmpeg it is of course
preferred to x264. So here is the setting table. If
anyone wants to help us convert this please jump on in.
view in mono font.
encode User Requires
approach Set x264 ipod optimal ffmpeg default Override
======= ==== ================= =================== ========
A x crf=19 crf=undef yes
B x bitrate=320 bitrate=3000 yes
B ratetol=1.0 ratetol=1.3
A & B cabac=0 cabac=0
A & B x ref=5 ref=1 yes
A & B deblock=1:0:0 deblock=0:0:0 yes
A & B analyse=0x1:0x111 analyse=0x1:0 yes
A & B x me=umh me=dia yes
A & B subme=6 subme=6
A & B brdo=1 brdo=0 yes
A & B mixed_ref=0 mixed_ref=0
A & B x me_range=21 me_range=4 yes
A & B chroma_me=1 chroma_me=0 yes
A & B trellis=0 trellis=0
A & B 8x8dct=0 8x8dct=0
A & B cqm=0 cqm=0
A & B chroma_qp_offset=0 chroma_qp_offset=0
A & B slices=2 slices=1 yes
A & B bframes=1 bframes=0 yes
A & B b_pyramid=0 b_pyramid=undef yes
A & B b_adapt=1 b_adapt=undef yes
A & B b_bias=0 b_bias=undef yes
A & B direct=2 direct=undef yes
A & B wpredb=0 wpredb=undef yes
A & B keyint=250 keyint=12 yes
A & B keyint_min=25 keyint_min=7 yes
A & B scenecut=40 scenecut=0 yes
A & B rceq='blurCplx^(1-qComp)' rceq='tex^qComp' yes
A & B qcomp=0.60 qcomp=0.50 yes
A & B qpmin=7 qpmin=2 yes
A & B qpmax=35 qpmax=31 yes
A & B qpstep=4 qpstep=3 yes
A & B ip_ratio=1.40 ip_ratio=1.25 yes
A & B pb_ratio=1.30 pb_ratio=udef yes
A & B vbv_maxrate=0 vbv_maxrate=9000 yes
A & B vbv_bufsize=0 vbv_bufsize=65536 yes
ffmpeg command line to follow....
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