[FFmpeg-devel] FFV1 specification: plane_count prior to version 4

Michael Niedermayer michaelni at gmx.at
Sat May 2 01:37:59 CEST 2015

On Fri, May 01, 2015 at 03:52:06PM +0200, Jerome Martinez wrote:
> In FFV1 specification, I read:
> > plane_count prior to version 4: without transparency: 2 else 3.
> > version 4 and later: gray: 1, gray+alpha or color:2, color+alpha:3
> but in both headers (FrameHeader01 or GlobalHeader), I see
> chroma_planes flag, it looks like all versions of FFV1 bitstream are
> supporting gray (and gray+alpha).
> Does it make sense to consider this difference between "prior to
> version 4" and "version 4 and later" as applicable to the FFmpeg
> encoder/decoder, not the FFV1 bistream specification itself?

plane_count was 2 for gray prior to version 4


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
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