I've seen this suggestion in many places, but you know, it doesn't really resolve the issue. I regularly have to edit webinar recordings from Zoom webinar. They are about an hour long 2650x1440 frames witih reasonable quality and the files are about 70-90 megs when I get them. Certainly not suitable for a movie, but for a webinar with slides, it's very reasonable: the frame size is nice and large, and you can read the text on the slides just fine. The audio quality is clear enough for the purpose. But, if I do ANY kind of edit in premiere pro and try to output again, I typically get a file of 900 megs down to as low as 750 megs. That's about 10 times the original size. Now, if it's just about bitrate, explain why this is the case when I choose the lowest possible bitrate setting (0.19) and the lowest frame rate (10). I'm using H.264. Obviously, the output file size is just not acceptable. When I have a folder with multiple sessions and most of them are under 100 megs then I have a file that is 750 megs and all I did was blur out a single word on a slide, or add a quick title, or in some cases, I just trimmed a little off the front without making any changes or additions. I've been battling this issue for a couple of years and really haven't found a suitable resolution. I now use other software to trim my videos and save without re-encoding, but this doesn't help if I have to make a small edit. There must be some way to get PP to output roughly the same file size as my original files? the only thing I found that works is to radically reduce the frame size, but then I have a much smaller video in which the slides cannot be read, and the file size is still 2-3 times the original size. Of course, this issue is compounded by the grossly inaccurate estimated output size. It's not unsual for PP to esimate my output size at under 100 megs then output a file 8 or 9 times that size.
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