Calculator based on resolution, fps and length

[filipcro]

I'm trying to find a simple calculator that outputs the size of the video file based on resolution, fps and length.

So, if I put in 1280*720, 24fps, 20min, I want to know what will be the size of the video file based on those 3 values.

 

[Fardringle]

There's an almost infinite number of possible answers using the same numbers for those three items. The primary determining factors of the size of a video are the bit rate of the video and the type of compression used.

 

[Gooberlx2]

The primary determining factors of the size of a video are the bit rate of the video and the type of compression used.

Exactly. H.264 compression, for example, will achieve better picture fidelity with a lower bitrate than, say, MPEG2. Additionally, you're mostly going to get average bitrates with newest codecs, which adapt frame-by-frame.

So, regardless of the resolution or fps...
20mins * 5mbps constant = 1200s * 5mbps = 6000mb / 8 bpB = 750MB

If you know your camera puts out 18mbps in 720p mode, then you can say that 20mins will equal ~2.7GB

 

[ElFenix]

it's bit rate * length for anything compressed. if not compressed, it's color depth (in bytes) * resolution * fps * length.

http://www.fastvideoindexer.com/articles/VideoSizes/VideoSize.htm

 

[serpretetsky]

do video compression methods use variable bit rates like a lot of audio compression methods?

 

[ElFenix]

do video compression methods use variable bit rates like a lot of audio compression methods?

yeah pretty much.

 

[Berliner]

Video can either use constant or variable bit rate, variable giving better results, of course.