[FFmpeg-devel] [PATCH] Google WebP support

Ivo ivop
Sat Oct 2 00:28:07 CEST 2010

On Friday 01 October 2010, 23:04:24, Mike Melanson wrote:
> On 10/01/2010 01:29 PM, Ivo wrote:
> > On Friday 01 October 2010, 03:45:38, Mike Melanson wrote:
> >> Do we care about metadata from any kind of image format? PNG comes to
> >> mind as metadata-friendly.
> >
> > How about EXIF metadata like aperture and shutter speed etc.?
> Absolutely. I'm well aware of the existence of metadata in image
> formats. It's just that FFmpeg presently doesn't care about any image
> metadata (at least, not that I can find through libavformat/img2.c).
> How could it handle metadata? The present image handling system seems to
> be geared toward processing large numbers of sequentially numbered
> images. In such a case, would metadata be concatenated? Unionized?

I suppose every image should have its own metadata and it depends on what 
happens to the images later on in the processing chain whether the metadata 
gets concatenated, discarded or rewritten or something. Converting a JPEG 
image with EXIF data to PNG should preserve the metadata, but converting 
hundreds of JPEG's into a videostream probably not. Unless the container 
format supports annotating every single frame of course :)


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