[FFmpeg-devel] [PATCH] Google WebP support
Sun Oct 3 12:41:31 CEST 2010
Ivo skrev 2010-10-02 00:28:
> 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 :)
MXF supports that FYI. For example, if you wanted to mux a DPX image
sequence you would most definately want all metadata for each image
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