Bitrate translated to MB/s

Started 2 months ago | Questions
phouphou Contributing Member • Posts: 517
Bitrate translated to MB/s

I have different options in my camera for HD video. For example 25p 24M or 17M.

I guess 24M means it has a bitrate of 24Mbits. I want to know how much MB/s of storage is taken up by 24M vs 17M.

If it's the same as inet speed 24Mbit should be 3 MB/s vs 2.1 for 17M

So 1GB gives me 5.5min vs 7.9min of record time. Is that right?

 phouphou's gear list:phouphou's gear list
Ricoh GR II Sony a7 II Sony FE 28mm F2 Sony FE 85mm F1.8 Sony FE 24-105mm F4 +12 more
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Sean Nelson
Sean Nelson Forum Pro • Posts: 14,367
Re: Bitrate translated to MB/s
3

A good rule of thumb is to divide bits by 10 to get bytes. The actual conversion is 8, but with overhead used by various protocols, metadata, etc. and the much easier division, it's a pretty decent rule of thumb.  If dividing by 10 vs dividing by 8 means you end up overflowing a memory card, then you're probably not leaving enough margin for error, IMHO.

So, 24Mbit/sec ~= 2.4MByte/sec.

If it's the same as inet speed 24Mbit should be 3 MB/s vs 2.1 for 17M
So 1GB gives me 5.5min vs 7.9min of record time. Is that right?

Yep, that's right.

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