[x264-devel] Transparency is lost during encoding wifth ffmpeg and x264

[David Wolstencroft]

There was quite some buzz about H.264 + Alpha at Apple's WWDC 2007, but I'm
not sure they've ever gone an implemented it in the H.264 encoder in
QuickTime.

On Thu, Sep 11, 2008 at 11:00 AM, Jason Garrett-Glaser <
darkshikari at gmail.com> wrote:

> On Thu, Sep 11, 2008 at 6:08 AM, Mustafa Aldemir <m_aldemir at yahoo.com>
> wrote:
> > Hello,
> >
> > I have a FLV video encoded by Adobe After Effects using On2 VP6 encoder.
> I want to re-encode this video using x264 codec. FFMPEG can decode VP6
> video, and encode x264. But after re-encoding the alpha channel transparency
> of the video is lost and the background is black. I searched a solution in
> ffmpeg list but, there was no response.
>
> There is no alpha channel in the YV12 colorspace.  Theoretically it is
> possible to encode an alpha channel using H.264, but I don't know of
> any encoder or decoder that implements such a thing.
>
> Dark Shikari.
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