[FFmpeg-devel] [PATCH] Google WebP support

Mike Melanson mike
Mon Oct 11 07:51:51 CEST 2010

On 10/10/2010 10:34 PM, Pascal Massimino wrote:
> In decreasing order of concern:
> * i dont' see the handling / validation of metadata in img2 (which
> is the primary goal of wrapping vp8 in RIFF).
> * how to handle alpha as a separate layer (that is: alpha is present in
> another chunk)?

VP8/WebP doesn't present an alpha channel. There are no current, public 
plans to support this.

> * vp8 is not the end of it. How could i tell that several video_codec_id are
> possibly found (i'm thinking adding a lossless variant for instance. Like
> ffv1 or ffv2 if it ever surfaces somewhere...)
> I'm not saying i can do that with a separate muxer/demuxer (yet), but i see
> img2.c as being an even harder way. No?

It seems that the primary problem that img2.c solves is being able to 
feed it an arbitrary amount of sequentially numbers images and encode 
them into a video file. In that context, metadata from an individual 
frame doesn't matter as much.

     -Mike Melanson

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