[FFmpeg-devel] DNxHD and qmax

Michael Niedermayer michaelni at gmx.at
Thu Feb 2 04:52:45 CET 2012

On Wed, Feb 01, 2012 at 11:13:46AM +0000, Joseph Artsimovich wrote:
> The default value for qmax in FFMpeg is 31, with FFmpeg's DNxHD
> encoder actually enforcing it. Now, enforcing qmax in a CBR codec
> makes no sence, as no one wants encoding to fail just because the
> minimum allowed quality specified by qmax doesn't fit into the given
> bitrate. The DNxHD specification actually specifies 1024 as the
> maximum quantization scale factor.
> Should I submit a patch making the DNxHD encoder ignore qmax?

the default value can be overriden, see libx264.c for example
that seems more flexible as the user then still can set it if he
really wants to


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many things microsoft did are stupid, but not doing something just because
microsoft did it is even more stupid. If everything ms did were stupid they
would be bankrupt already.
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