Completely off topic for this forum but does anyone by any chance know of a hopefully free or cheap way to fix jittery video pans because I used (I now realise) the wrong shutter speed relative to the frame rate while filming some b-roll for a freelance gig? I’ve tried searching around but can’t find much. It seems I need to introduce a little motion blur to cover the jitters.
It’s not the end of the world as I have other clips and stills I can use but if anyone’s got any useful info at their fingertips and doesn’t mind pointing me to some resource that would be great.
Out of curiosity, I did a few searches and found a comment “There is software to add motion blur to moving subjects.” But the commenter never went on to identify the software.
Yeah, I found stuff like that. Davinci Resolve, the free version, was supposed to have something but that feature seems to be paid now and I’d need to figure out how the software works first. The video was just an offer to help out a reporter whose copy I’ll be editing so just a nice to have, really.
I haven’t tested this myself, but here is a link to add motion blur in Resolve: Motion Blur - Resolve
There are different techniques one could try with kdenlive, which is FOSS. (I’ve stopped using kdenlive due to its color management limitations.)
I assume the jittery video is from using a fast shutter speed for the frame rate. The conventional speed is 2x the frame rate, so for 24 frames/sec you would use 1/48th sec, ideally. In video terminology, this is called a 180-degree shutter angle, which comes from old-school film cameras with rotating shutters. Rotary disc shutters
There are exceptions to the shutter-angle rule, but that’s a bit of an advanced topic.
Thanks. I’ll have a look at that link. Yeah, I even kind of knew the rule in the back of my head from watching something from Chris and Jordan once but it didn’t make it to the front of my head at the time.
I’m not sure what you mean be “jittery video pans”. If there is a strobe effect because the shutter speed was too fast, you can process each frame to be a weighted average of that frame and the previous frame and the next frame.
I expect this can be done using just ffmpeg. It can certainly be done by extracting the frames with ffmpeg, processing them with ImageMagick, and reassembling the frames into a movie with ffmpeg.
Not at my computer, but I’m wondering if such kind of “resampling” or moving weighted averaging can be done with shotcut (which is FOSS and also provides color management)