[FFmpeg-user] Writing my own filter - fisheye to Mercator projection.

[Jesper Taxbøl]

Cool thanx for the links.

:)

2015-06-09 11:36 GMT+02:00 Moritz Barsnick <barsnick at gmx.net>:

> Hei Jesper,
>
> On Tue, Jun 09, 2015 at 10:06:17 +0200, Jesper Taxbøl wrote:
> > I would like to be able to map a circular fisheye image into a Mercator
> > projection.
> >
> > How would I go about writing my own filter that do this?
>
> I too would like to know more about writing filters. :-) I haven't made
> much on an effort yet though.
>
> This is ffmpeg's official introduction, right in your source tree:
> https://github.com/FFmpeg/FFmpeg/blob/master/doc/writing_filters.txt
>
> Here's also a short intro with some basics:
> http://wiki.multimedia.cx/?title=FFmpeg_filter_HOWTO
>
> I don't know if there's anything better in terms of introductions.
>
> The API is documented here:
> https://www.ffmpeg.org/doxygen/2.0/group__lavfi.html
>
> Apart from that, I would go looking through the available filters in
> the libavfilter/ subdirectory, and choose a basic one which does
> conversions only in a single frame as an example. Unfortunately, ffmpeg
> source code is not all too verbose with comments (as to what certain
> lines of code are supposed to do).
>
> In your case, something like "rotate" (vf_rotate.c) or "perspective"
> (vf_perspective.c) comes to mind.
>
> > Ideally I would like a filter I could pass a shader. But I guess I'm
> > dreaming here.
>
> I have no idea what this is about. ;-)
>
> Oh, and when you're done, and you think it may be useful for others,
> feel free to submit it to ffmpeg-devel for inclusion. They will rip it
> apart from you and tell you where you went wrong.
>
> Hilsen,
> Moritz
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>



-- 
Jesper Taxbøl
+45 61627501