[FFmpeg-devel] libavcodec/hap : add HapAlphaOnly decoding/encoding

Carl Eugen Hoyos ceffmpeg at gmail.com
Sat Oct 7 17:53:55 EEST 2017

2017-10-07 16:32 GMT+02:00 Martin Vignali <martin.vignali at gmail.com>:
>> > IMO, the ffmpeg support is mostly interesting to convert hap
>> > file to something else or to check what we can encode with
>> > the ffmpeg hap encoder.
>> I don't disagree (on the contrary), I believe we should make it
>> as easy as possible for users to work with it:
>> Do you believe that it would be easier for users if HAP alpha only
>> is represented as FFmpeg RGBA or gray?
> IMHO, from a compositing point of view, alpha only and gray is
> the same thing.
> It's common (in cgi compositing for example), to use alpha (or
> matte) as separate gray only file.

If this is what you believe, I don't think an RGBA representation
should be committed.

Carl Eugen

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