每1gb大約可以拍多少分鐘片 ?
我自己32gb真係好難用得完
我部iphone 3gs 16g用左9個月都係用得2gb ...
ioioman 發表於 2010-9-2 03:37
iPhone 4 video size for 250 mins if true 720p (1280 x 720):
( [1280 x 720 x 24] / 8 ) / 1024 = 2700 KB / frame
2700 KB/frame x 30 frames/sec = 81000 KB/sec
81000 KB/sec / 40 compression ratio = 2025 KB/s compressed
2025 KB/sec compressed * 250 min * 60 s / min * 1 MB / 1024 KB * 1GB / 1024 MB = 28.97 GB (118 MB / min)
If a higher 60:1 compression ratio is used by the more powerfull iPhone 4: 79 MB / min
http://whenwillapple.com/blog/20 ... o-should-i-go-32gb/ |