What else affects Filesize?

[ApacheWraith]

Is bitrate the only thing that affects filesiz? Does using the high quality settings make a bigger file? Thanks.

Wraith

[Vejita-sama]

Nope, just the bitrate and the runtime. The size of the source video, the resolution of the source, the resolution of the encoded MPEG, nor high/low motion search affects file size.

[ApacheWraith]

Alright, cool. The reason I ask is that I was testing KingViper's and Sefy's SeVCD template. With them both stock, the results were about the same, except Sefy's template bore an 8 something MB file size and the KingViper one was like 9 something, still not a bad compromise. I tweaked it a little bit and it turns out I got a bigger file. I actually lowered the bitrate if anything because it was set at 2000 Constant Quality. Now that little bar above those settings that doesn't affect filesize? Also when I take the disk and put it in my computer, after it is burned to a disk, it says the file is 2.15 MB, that is smaller than the resulting file after conversion, how did I do that?

Wraith

[sean madison]

the following affects file size-

Bitrate(duh)
RES, if its bigger than source, larger file.
FPS- if its lower than source, it can be bigger but not always(kinda weird)
Ghost reduction at high settings can make file bigger for some reason

[vitualis]

The there are only TWO things which affect the final file size:
1. bitrate
2. runtime

filesize = bitrate x runtime

There only time when things like resolution and video complexity can affect filesize is when you are encoding in such a way such that you don't have CONTROL of the bitrate (e.g., CQ VBR encoding).

If you are encoding in such a way that you can control the max, min and average bitrate, then the average bitrate (and runtime) are the only two things that will affect the resultant filesize.

Regards.

[sean madison]

Yes, Virtualis, that is what i was referring too.

[vitualis]

As I guessed, but you didn't elaborate on that very important point.

If I do a multipass VBR encode where I can set max, min, and avg bitrates, or if I do a simple CBR encode, then things like resolution, video complexity, filters to remove noise, framerate, etc., make absolutely no impact on the final filesize.

Regards.