<div dir="ltr">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.<div><br><br><div class="gmail_quote">On Thu, Sep 11, 2008 at 11:00 AM, Jason Garrett-Glaser <span dir="ltr"><<a href="mailto:darkshikari@gmail.com">darkshikari@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="Ih2E3d">On Thu, Sep 11, 2008 at 6:08 AM, Mustafa Aldemir <<a href="mailto:m_aldemir@yahoo.com">m_aldemir@yahoo.com</a>> wrote:<br>
> Hello,<br>
><br>
> 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.<br>
<br>
</div>There is no alpha channel in the YV12 colorspace. Theoretically it is<br>
possible to encode an alpha channel using H.264, but I don't know of<br>
any encoder or decoder that implements such a thing.<br>
<br>
Dark Shikari.<br>
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