[MPlayer-dev-eng] MNG support for MPlayer

[Reimar Döffinger]

Hello,
On Thu, Sep 25, 2008 at 09:22:44PM +0200, Stefan Schuermans wrote:
> I'll try to fix the "whole demuxer / just the stream" issue and I would 
> also like to try to implement the alpha channel (it is supported by MNG 
> and libmng) although I've not yet used that. Can you point me to the 
> correct place in the tech docs of MPlayer that describe how to set up 
> the fields in the video stream header to use the alpha channel, i.e. to 
> make MPlayer expect RGBA instead of RGB in the demuxer packets?

Set biBitCount to 32 and biCompression either to
mmioFOURCC(32, 'B', 'G', 'R') or to 0.
Note that (most of) MPlayer can not actually make use of it, though it
might work with -vo png (never tried).