Add feature to extract a single frame to an image file

[scottmc]

See https://ottverse.com/thumbnails-screenshots-using-ffmpeg/ for some tips on using frames:v to grab an image from the input file.

[andimachovec]

This would be quite simple to implement. But I'm not sure how and where to place that feature in the GUI. Do you have any ideas on that?

[scottmc]

Maybe on a new tab? And add a view to show the frame at the currently selected time, and maybe a button to export it.

[andimachovec]

@humdingerb @scottmc
In my opinion this feature is a bit out of scope for a simple ffmpeg gui. Exporting single frames can be done on Haiku with the Medo video editor. What do you guys think?

[humdingerb]

At least for now, I agree. For this and other features (cutting, for example) we'd need to integrate a video playback to scrobble through a clip, possibly respecting I/B frames etc. This appears to be a bit out of scope...
I wouldn't rule it out forever, but we'd need a lightweight solution for the above first.

[scottmc]

Ok, removed from the 1.2 milestone, maybe check back in the future on this.