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# Calculating sxs card capacity @ 720p and 1080p @ 1 fps

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 Calculating sxs card capacity @ 720p and 1080p @ 1 fps on Feb 15, 2010 at 9:28:22 pm

Im shooting time lapse of a stage and am trying to figure out how long 2 16 gig cards will last me shooting at 720p @ 1 fps and also at 1080p @ 1fps. Anybody know how to calculate this.

Thanks!

 Re: Calculating sxs card capacity @ 720p and 1080p @ 1 fpson Feb 15, 2010 at 10:31:26 pm

Do a google search for data bitrate calculators- there are tons of them. Such as:

itunes.apple.com/us/app/aja-datacalc/id343454572?mt=8

-Noah

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 Re: Calculating sxs card capacity @ 720p and 1080p @ 1 fpson Feb 15, 2010 at 10:31:35 pm

Since the data rate per second on playback is relatively the same (given it's a VBR codec) at 35mbps, your time base may make a difference.

For example, 720p24 and 720p60 are both at 35mbps so a frame at p24 would have more data.

For the same reason 720p24/60 records at a higher data rate than 720p30/60. Playback is 35mbps so the former is 2.4x whereas the latter is 2x

 Re: Calculating sxs card capacity @ 720p and 1080p @ 1 fpson Feb 16, 2010 at 12:44:03 am

Don't need to get dressed of Einstein.
Think how much time you can record normally, and multiply by 24 or by 30.
Rafael

http://www.nagavideo.com