32 vs 16 gig iPhone 4. 720p video will take how much space?! Battery!?

[vegas-steven]

So the concept of the video on iPhone 4 being 720p is great.
I just wonder if people here can answer:

1.) how much space will 720p video take on the device? I'm taking a vacation on the 17th of july and I'd like this to replace a camcorder

2.) assuming I don't roam on the phone (said vacation is in philippines) then how much battery life will this kill assuming I don't render video on the device and just record and play back.

Perhaps there are users here who can assume the storage needed based on codecs etc...

Any ideas?

 

[PoitNarf]

It all depends on what bitrate the iPhone 4 records video at. For example, my Canon 7D takes up ~ 160MB of space for 30 seconds of 720p video at 24fps, but it records it at a very high bitrate of 46Mbps. I severely doubt the iPhone 4 would record video at bitrates this high. Unfortunately we probably won't know how much space video recording will take until the iPhone 4 is released. Don't know about battery life when recording video, but the video playback time Apple lists is 10 hours. Video recording will use more juice, but how much more we don't know.

 

[Small White Car]

It's just a guess, but I'm betting on 3 to 4 GB per hour of video.

Really, it could be anything from 2 to 40 GB per hour, so your guess is as good as mine. But I'm putting my money on the 3 - 4 range.

 

[daphuon2]

here u go!

http://whenwillapple.com/blog/2010/...+(When+Will+Apple?)&utm_content=Google+Reader

iPhone 4 video size for 250 mins:

( [960 x 720 x 24] / 8 ) / 1024 = 2025 KB / frame

2025 KB/frame x 30 frames/sec = 60750 KB/sec

60750 KB/sec / 40 compression ratio = 1518.75 KB/s compressed

1518.75 KB/sec compressed * 250 min * 60 s / min * 1 MB / 1024 KB * 1GB / 1024 MB = 21.73 GB

read more about it on the link above...

 

[emuneee]

here u go!

http://whenwillapple.com/blog/2010/...+(When+Will+Apple?)&utm_content=Google+Reader



read more about it on the link above...

Where is this 960 value coming from? 720P is 1280x720.

 

[daphuon2]

Where is this 960 value coming from? 720P is 1280x720.

read the link, i have no idea how its calulated, but it says so in the link

 

[Small White Car]

Where is this 960 value coming from? 720P is 1280x720.

I have no idea if his source is right, but 960x720 is the exact same frame size that DVCPRO HD uses. It's an anamorphic format which means that it records at 960x720 and then stretches itself to play back at 1280x720.

So I suppose it's possible that the iPhone will be doing the same thing.

 

[diamond.g]

Where is this 960 value coming from? 720P is 1280x720.

They just doubled the VGA resolution (from the 3GS). So if anything the 21GB for 250 minutes of video is probably on the small side (assuming the video compression stays the same).

EDIT: actually re-read the article. They say they doubled the resolution, but the numbers don't bear that out :/.

 

[daphuon2]

i dont know if hes right or not, im just trying to give u guys a better idea of how big it might be from someone who has did the math... like i said, i dont know if hes right or not, but it should give u a ball park.

 

[emptyCup]

i dont know if hes right or not, im just trying to give u guys a better idea of how big it might be from someone who has did the math... like i said, i dont know if hes right or not, but it should give u a ball park.

But the OP's question was not how storage would be affected but how it would affect battery life. Does it take more power to shoot higher density video? I don't know.

 

[daphuon2]

But the OP's question was not how storage would be affected but how it would affect battery life. Does it take more power to shoot higher density video? I don't know.

he had a 2 part question, and one of them was how much space hd video would take.

 

[lorenwade]

Well... I don't understand the math... but I think it's pretty simple. The Flip camera I had held 8 gb and record two hours. I'm pretty sure this will be similar with the iPhone.

 

[vegas-steven]

Either way about dismal and another agument for why i wish there were a 64gb model.