I’m compressing a 33-minute (1440×900, 25 fps) video in Premiere Pro, for online delivery. The first 30 seconds is a talking head, and the rest is composed of still images. It’s basically a narrated slide show with an introduction by the presenter, Zoom-style.
I was provided with his original clip, and he asked me to make a couple of cuts. However, I’m having trouble with the compression.
His original 34-minute clip came in around 55MB, H.264. But I can’t approach that file size without losing too much quality, compared to the original.
I’d love to keyframe the compression, which I recall doing back in the day with Premiere 4.1, to set a high rate for the intro, and low for the stills. Not sure if I can still do that.
How could I get a low file size, but high quality for the talking head intro?
(I’ve used 2-pass VBR, target .25 Mbps, max 20Mbps, audio AAC-44-128, Max quality, KF distance 45, but the file is around 96 MB and the result is blockier than the original.)
Edit: it’s been a while since I’ve worked with highly-compressed source, so if I have to accept this degree of generational loss, sure.
Ugh. Zoom has a highly compressed recording format with a very difficult GOP structure that generally is a problem for NLEs. Zoom has a NLE compatible mode that one is supposed to use if the file is to be edited later.
The file will be very small but difficult to edit. You should convert to Apple ProRes. Baring their extreme encoder settings, it will be difficult for you to compress that small with that quality. BTW you can see the actual GOP structure and frame by frame bit rate in Telestream Switch Pro. Ideally you’d want multipass, High Profile, CABAC entropy but it would be difficult to match their very sparse keyframes.