[FFmpeg-devel] [RFC] Feeding bit masks into encoders (particularly an ICO muxer)

Carl Eugen Hoyos cehoyos at ag.or.at
Fri Aug 3 21:56:55 CEST 2012

Michael Bradshaw <mbradshaw <at> sorensonmedia.com> writes:

> IIRC, BMPs can be encoded with: 4bit or 8bit palettes; 
> or 16bit masked bitfields; or 24/32bit BGR(0/A). I'd like 
> to support more than just 24/32bit pixel BGR(0/A) formats 
> though, and if a pixel format with <24 bits is chosen I 
> don't think I could just read the alpha channel...

FFmpeg only support transparency (in this context) for pal8 
and rgb32, everything else should be handled as opaque imo.

Carl Eugen

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