Compression problem, frame size inversely related to file size?

Question

I have compressed a long string of 4k video hoping to create a file close to 1GB in H.264. When I compress it at 960x480, at medium resolution, I get a 2.67GB file. Strangely, when I compress the same sequence to a 640x360 fram size at medium resolution, I get a 5.86GB file. This makes no sense to me.

It could be that my resolution is changing as I muck with the frame size setting and add a time code window, but I don't see why it would be twice a big a file. Am I doing something wrong? Should I compress to a format other than H.264? Is there a way to keep the resolution the same, because every time I change it, the frame size reverts to the original size, which is 4k?

Thanks!

R Neil Haugen · Accepted Answer

File size is mostly determined by bitrate times the length of the video. The framesize only sets how sharp things are in the image. The bitrate sets the file size as far as bytes. Neil

Michael Grenadier · Answer

what do you mean by "medium resolution?"  Resolution usually refers to pixel dimensions (at least I think it does).  do you mean bit-rate or quality?"  Try working with one of the h264 presets (such as those for youtube) to start with and then adjust the parameters if necessary...

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