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 [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
