[FFmpeg-devel] [PATCH/RFC] set qscale_type for MPEG-4

Michael Niedermayer michaelni
Wed Feb 3 01:16:02 CET 2010

On Tue, Feb 02, 2010 at 11:54:26PM +0100, Reimar D?ffinger wrote:
> Hello,
> I have no idea if this actually makes sense, but MPlayer's -vf fspp seems to
> look a lot better with it for me - no idea if MPEG-4 qscale is more similar
> to MPEG-2 or MPEG-1.

mpeg4 has 2 quantizer types, one matches h263 one mpeg2 with a factor of 2
difference in qscale
mpeg1 and 2 depend on the used quant matrixes as well, thus make tripple sure
your test files use the default matrixes and mpeg4 uses h263 style
or you will have to analyze the matrixes to
adjust qscale. Also the reference is spp not fspp
i hope the recent addition to the qscale types is based on more than this


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I know you won't believe me, but the highest form of Human Excellence is
to question oneself and others. -- Socrates
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