[Ffmpeg-devel] Differences between mencoder and ffmpeg whenencoding using x264

[Erik Slagter]

On Tue, 2006-02-21 at 11:09 +0000, Robert Swain wrote:

> > ffmpeg                   mencoder
> >
> > cabac=0                  cabac=1
> > ref=1                    ref=1
> > deblock=0:0:0            deblock=1:0:0
> > analyse=0x1:0            analyse=0x1:0x111
> > me=dia                   me=hex
> > subme=6                  subme=5
> > brdo=0                   brdo=0
> > mixed_ref=0              mixed_ref=0
> > me_range=4               me_range=16
> > chroma_me=0              chroma_me=1
> > trellis=0                trellis=1
> > 8x8dct=0                 8x8dct=0
> > cqm=0                    cqm=0
> > chroma_qp_offset=0       chroma_qp_offset=0
> > slices=1                 slices=1
> > nr=0                     nr=0
> > bframes=0                bframes=0
> > keyint=12                keyint=250
> > keyint_min=7             keyint_min=25
> > scenecut=0               scenecut=40
> > rc=cbr                   rc=cbr
> > bitrate=3000             bitrate=3000
> > ratetol=1.3              ratetol=1.0
> > rceq='tex^qComp'         rceq='blurCplx^(1-qComp)'
> > qcomp=0.50               qcomp=0.60
> > qpmin=2                  qpmin=10
> > qpmax=31                 qpmax=51
> > qpstep=3                 qpstep=2
> > vbv_maxrate=9000         vbv_maxrate=9000
> > vbv_bufsize=65536        vbv_bufsize=8000
> > ip_ratio=1.25            ip_ratio=1.40
> 
> So...
> 
> -ac

Huh? -ac is actually number of audio channels, another one that needs to
be renamed... Suggestions? How about simply calling the non-ffmpeg
option "cabac"?

-coder 1 works, but is not quite readable.

> -partitions parti4x4+partp8x8+partb8x8

It looks like ffmpeg has separate flags for x264 for this:

-parti4x4                  E.V..
-parti8x8                  E.V..
-partp4x4                  E.V..
-partp8x8                  E.V..
-partb8x8                  E.V..

Will try to get mencoder style output out of ffmpeg with these options
shortly.

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