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I convert recorded lectures for online viewing. I always use the same settings (with some experimentation mentioned in parentheses below) but the file sizes of the exported videos are wildly different. My settings, most of the time are:
The duration changes but it doesn't correlate to the difference in file size. For example, the follow videos use the above settings:
The longest videos I ever do are approximately one hour. Sometimes videos of 45-55 minutes are well below 1 GB, sometimes well above up to several GB.
I arrived this morning to find a 33 minute video export with a file size of just below 10 GB. That broke a record.
If anyone can offer any insight I'd be grateful. Thanks in advance.
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File size is determined by bitrate x duration.
If you change the bitrate so will the file size. Does not make any difference if you do 1 pass or 2.
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How do I find the bitrate of the original footage?
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I also want to add that sometimes I'll get similar recordings from someone else and my conversion to WMV triples or quadruples the file size -- again, experimentation gives me no clues.