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Old 02-19-2013, 05:07 AM   #1
max384 OP
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Joined: Nov 2011
Location: Sugar Notch, PA
Oddometer: 3,039
Help with bitrate and storage space on a Sony Action Cam

I've started recording all of my daily commuting rides just in case I am in an accident. I record for a few days and then delete all the footage (unless I get something good, of course) to make room for more recording. I had been recording in 1080p, but decided to see how much space 720p or lower would take up. This is where I'm having trouble. Hopefully some of you computer/video geeks can give me a hand with this.

When I click on my 1080p videos and go to details the bitrate is listed at about 16,000 kbps.

Since there are approximately 1000 kilobytes per megabyte, than the bitrate is about 16 mbps.

My SD card storage space is 29.8 gb, which is about 29,800 mb. Using the bitrate of 16 mbps, to get the number of seconds of recording time for my SD card I take 29,800/16 = 1860 seconds. 1860/60 = 31 minutes.

I have way more than 31 minutes of storage space, so what gives?

I decided to backtrack and used a 35 minute segment of video. The listed bitrate was 15,980 kbps, so for all intents and purposes 16 mbps. The video is 35 minutes 23 seconds long, which is 2123 seconds. The total size of the video is 3.98 gb, which is 3980 mb.

By dividing the total size of the video in megabytes by the length in seconds, I should end up with the actual bitrate in megabytes per second.

3980/2123 = 1.87 mbps

What gives? Is the listed bitrate erroneous? Am I screwing up this simple math (not enough coffee yet this morning)? Or am I just overlooking something simple?

Thanks.
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