It is all about the reason you are exporting.
Some of those are good for exporting video to be edited in other programs. NTSC DV for example. That is the format shot by MiniDV cameras. So if you are editing DV AVI, that would be a logical output for further editing in other applications.
Others, like H.264 are good for putting videos on web sites, or for YouTube or Vimeo.
File size is pretty much set when you export to DV. It is just under 13GB for an hour of video based on a 25Mb/s data rate.
Other codecs are more flexible. You can shrink the file size by shrinking the frame size, or lowering the frame rate, or most often, by lowering the bitrate. Scaling down the video has obvious results. Lowering the frame rate can cause stutter and is only good for certain footage, and reducing the bitrate starts to cause a lack of quality video.
Perhaps if you told us what you wanted to do, we could provide more specific suggestions.
thank you for writing.
i wanted to put up a 5 min. utube but the first try was 1.6 GB.
i thought i had scrunched it down at 720 or 640?. I have a 4m
vid up there only 165 mb & nice quality at 720 or 1080 so i'm puzzled.
And then i had a 2 m 4:3 480? at 365 MB, so i'm puzzled. i usually
just export QT H264 with original sequence setting or smaller.
I dont have a complete mental inventory of these details, but you
get the drift. So i was just looking for a summary of settings so I
can be more aware and stop these wild variations.
The list of presets you show in the screenshot are for QuickTime. Since the
clip is destined to be posted on YouTube, you'll be better off using one of the h.264 presets tailored to YouTube.
As to the file size, that's determined only partly by the video dimensions. In fact, in some cases the dimensions in pixels is completely unrelated to the resulting file size. The bitrate is far more important in that regard for those export formats that give you control over that parameter.
Mark is correct. I should have been more specific.
Reducing the frame size merely allows you to use a lower bitrate to achieve a certain quality. The same with frame rate, The fewer pixels in the frame, the less data is required to describe those pixels. The fewer frames, the less bits you require to describe the pixels in those frames.
But it is about bitrate,
Also, it is about the ability of the codec to compress.
Right now, H.264 is the codec of choice for most of us. And we are waiting (impatiently) for H.265 which promises a huge reduction in the number of bits it takes to describe video.
For YouTube, you can export a 1920X1080 video, using H.264 at 20Mb/s, 1-Pass, and still get a reasonably sized video.