[NUT-devel] [RFC] FourCCs for rawvideo rgb4_byte / bgr4_byte

[Stefano Sabatini]

On date Wednesday 2010-05-26 03:34:49 +0200, Michael Niedermayer wrote:
> On Wed, May 26, 2010 at 12:49:54AM +0200, Stefano Sabatini wrote:
> > On date Sunday 2010-05-23 04:30:44 +0200, Michael Niedermayer wrote:
> > > On Fri, May 21, 2010 at 12:19:10AM +0200, Stefano Sabatini wrote:
> > > > Hi all, this follows a thread from ffmpeg-devel:
> > > > http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/109054/focus=109394
> > > > 
> > > > I proposed these names:
> > > > B4BY (bgr4_byte) Packed BGR 1:2:1,  8bpp, (msb)1B 2G 1R(lsb)
> > > > R4BY (rgb4_byte) Packed RGB 1:2:1,  8bpp, (msb)1R 2G 1B(lsb)
> > > > 
> > > > Other idea:
> > > > bgr4_byte => B[1][2][1]
> > > > rgb4_byte => R[1][2][1]
> > > > 
> > > 
> > > > Note that I'm very satisfied with these names, maybe someone can find
> > > > a better scheme.
> > > > 
> > > > What do you think?
> > > 
> > > i think you are missin a "not" in your sentance
> > 
> > Yes indeed.
> >  
> > > and iam not sure abut the fourccs here, this format is simply inefficient
> > > to store 4bit rgb, is it used in the wild?
> > 
> > I have not the faintest idea, and I couldn't even manage to understand
> > who introduced it, since it exists since the night of time of FFmpeg.
> 
> i probably added it to sws for playing with 4bit dithering
> 
> 
> > 
> > > if not (its just for ffmpegs test lavfi test system we can just pick any
> > > random fourcc and treat it like some ffmpeg internal thing)
> > > either of your choices would do for that
> > 
> > My problem is that I need to *write* such a format in NUT, so I need a
> > codec for that. Also to add such a tag shouldn't hurt anyway. If you
> > have an idea for avoiding to define a tag for it and still be able to
> > store such a format in NUT please tell (well an idea would be to make
> > possible to define the codec tag), as for me I prefer to add these two
> > rather than add exceptions/special cases to the FFmpeg code.
> > 
> > Patch updated, regards.
> 
> >  nut4cc.txt |    2 ++
> >  1 file changed, 2 insertions(+)
> > 6e19f1c1d96011a3c5ac6716f91f1040703604bb  add-bgr4-rgb4-byte-codec-tags.patch
> 
> ya ok

Applied.