On Wed, Apr 7, 2010 at 5:34 AM, MyFirstMemoryDotOrg <[email protected]> wrote: > > Hey folks, > > thinking about purchasing the Kodak Zi8 and get back on the vlogging horse. > It can apparently take a SDHC card of up to 32GB. > > My question is, how much recording time do I get out of that at: > - 1080p, 30fps? > - 720p, 60fps? > - 720p, 30fps? > - WVGA, 30fps? > > CNET says "We calculated that when you record video at the highest level > (1080p), you eat up anywhere from around 110 to 150MB per minute, depending > upon video content, or about 14 to 18 minutes of video on a typical 2GB card. > (Kodak quotes 20 minutes per gigabyte, but that's for 720p.) Similar to most > competitors, videos are encoded as generally compatible QuickTime MPEG-4 MOV > files, using H.264 compression." > > However, my googling gave me wildly varying estimates. What gives?
That's because it's not the same for all devices. Some use variable bit rate while others may use a constant bit rate. And if it's using VBR, then the capacity depends upon the actual image you are shooting (e.g. fast moving sports action would use a lot more than a talking head vlog). My Xacti HD1010 is speced to encode at: 9Mbps for 1280x720 30fps (4GB/hour) 12Mbps for 1280x720 60fps (5.4GB/hour) 12Mbps for 1920x1280 30fps (5.4GB/hour) 14Mbps for 1920x1280 60fps (6.3GB/hour) That should give you a reasonable ballpark estimate for the Zi8. Dave.
