[FFmpeg-devel] [PATCH] libavcodec/libvpx: Add VPx alpha decode support

James Zern jzern at google.com
Fri Jul 15 06:31:57 EEST 2016

On Tue, Jul 12, 2016 at 1:47 PM, James Almer <jamrial at gmail.com> wrote:
> What's the first libvpx version that supports vp8a and vp9a?
> Configure currently checks for 0.9.1 as the oldest supported
> version for vp8 decoding, 0.9.7 for vp8 encoding, and 1.3.0 for
> both vp9 components. We then use a bunch of ifdeffery to make
> sure things compile with every version supported, so depending
> on the answer to the above question this patch (and the one
> adding vp9a enconding) may need to do the same, or it could be
> a good reason to clean up things a bit and bump the minimum
> required version for every component to for example 1.3.0.

This has come up before. I'm OK with bumping the minimum and will send
something for that, though I'd say 1.4.0 (4/2015) is a better base for
vp9; 1.3.0 could produce invalid bitstreams. Any objections?

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