steps_per_scene is a non-obvious cap on video length

[usergenic]

I was doing a long video render (6 minutes) and found my runs were arbitrarily stopping at around 2000 frames. After digging through the code it looks like they stopped because the steps_per_scene value was arbitrarily set to 60000 or so and I was doing 30 steps per frame.

This steps_per_scene value seems kind of non obvious to me. Consider dropping this limit at least for Video Source?

[usergenic]

oh okay lol just realized that even with video source an arbitrarily high number of steps_per_scene will result in near endless rendering. so what we really need is a way to calculate the steps_per_scene number based on the length of the video input.

[dmarx]

I like your thinking here. I don't think it should be too hard to add a setting for something like "process all frames in video source". conversely, could probably add a warning or something along those lines to alert the user if the steps per scene is too low to run the length of the video.