[FFmpeg-devel] [PATCH] libvpx: Enable vp9 alpha encoding

Vignesh Venkatasubramanian vigneshv at google.com
Fri Jul 1 21:12:03 CEST 2016

On Fri, Jul 1, 2016 at 11:06 AM, James Almer <jamrial at gmail.com> wrote:
> On 7/1/2016 2:53 PM, Ronald S. Bultje wrote:
>> Hi,
>> On Fri, Jul 1, 2016 at 1:40 PM, James Zern <jzern-at-google.com at ffmpeg.org>
>> wrote:
>>> On Fri, Jul 1, 2016 at 10:07 AM, Carl Eugen Hoyos <cehoyos at ag.or.at>
>>> wrote:
>>>>> Do we have decoder support (for either vp8 or vp9) for these files?
>>>> No, only encoding and muxing.
>>> Seems like a feature request, but no reason to block this one if the
>>> vp8 one is here.
>> I'm not sure I have an opinion on this... But it feels strange to allow
>> encoding of content we cannot decode. Being ffmpeg, how do we recommend
>> people handle the files created with this feature, if not by using ffmpeg
>> itself?

One plausible reason is that Chrome can decode this. So it will be
useful for people who already have ffmpeg in their pipelines and want
to create such files. And like James Almer mentioned, this isn't a
first. VP8 Alpha has been this way too.

> We already create animated webp files that we can't decode. It wouldn't
> be a first :P
> PS: We should really add animated webp decoding, for that matter.
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