[FFmpeg-devel] filtering based on exif information

[Clément Bœsch]

On Tue, Nov 19, 2013 at 03:10:44PM +0100, Jan Pohanka wrote:
> 2013/11/19 Clément Bœsch <u at pkh.me>:
> > On Tue, Nov 19, 2013 at 02:03:31PM +0100, Jan Pohanka wrote:
> > [...]
> > Look at how a filter is initialized (libavfilter/avfilter.c,
> > avfilter_init_dict()). You can probably transmit the metadata dictionary
> > as well (by merging with the options dict or something).
> >
> 
> Thank you for further explanation. Access to the metadata could work
> for gobal metadata for whole stream. However this does not fully fit
> on my task. In fact EACH frame can have own different metadata in my
> mjpeg. So I think I have to access them in filter_frame function
> directly.
> Now I see that AVFrame has metadata field as well, maybe this can be the way...
> 

If you want per frame metadata that's indeed already available. And it
should be transmitted. rotate filter should work with a per-frame changing
value (you can set a rotate expression IIRC, which changes the value for
each frame), so it could be updated to use the frame metadata.

-- 
Clément B.
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