How many minutes can be recorded in 32Gb

[jparnold]

I have searched the internet but could not locate a web site which would answer this question.

I would like to know how many MINUTES (approx) of video recorded in highest quality 1080/50p video on a 32Gb SDHC memory card.

I have found a web site which suggests that 5 hours 20 minutes can be recorded with the camera's in built memory (32Gb) yet only 2 hours 40 minutes on a 32Gb SDHC memory card. I cannot understand why the inbuilt memory can store more than twice as much as on an equivalent size SDHC card.

Thanks

[Ken Berry]

Are you absolutely sure that the inbuilt memory is recording 1080P as opposed to 1080i??? That would seem to me to explain the exactly double capacity to the P reading...

[jparnold]

Hi Ken
Maybe one is for 1080p and the other for 1080i but this is not explained.
The 'capacities' in the specifications show -

[Ken Berry]

Nope -- I can't explain it. That chart makes it pretty clear we are talking about 1080p for both the inbuilt memory and external card...

[canuck]

I have searched the internet but could not locate a web site which would answer this question.

I would like to know how many MINUTES (approx) of video recorded in highest quality 1080/50p video on a 32Gb SDHC memory card.

I have found a web site which suggests that 5 hours 20 minutes can be recorded with the camera's in built memory (32Gb) yet only 2 hours 40 minutes on a 32Gb SDHC memory card. I cannot understand why the inbuilt memory can store more than twice as much as on an equivalent size SDHC card.

Thanks

Can you post a link to the website that claims there is a difference between built-in and external memory. What camera would they be talking about?
There is no way ((in my opinion) that there should be a differnece unless the recording settings are different.

[erdna]

The publication is simply wrong. At an 28Mb/s datastream (whatever, i or p) you get exactly 2 h 39.783 min (~2h40min) on a 32GB memory of whatever kind of data carrier(HDD ,SDHC...)
It's just about basic calculation: 32x1024x1024x8 to get the number of bits (1byte = 8bits) on the memory. This equals 268435456 bits. The number of bits/sec is 28000. So, the number of seconds is 33554432/28000=9586.98 seconds. This means expressed in hours 9586.98/3600=2.66305 hours. 66305% of een hour means 60x0.66305= 39.783 minutes

[jparnold]

Here is the web site url http://panasonic.net/avc/camcorder/hd/x ... tions.html

Maybe it's as Ken suggested (even though the chart doesn't indicate it) that one is at 1060p and the other 1060i

I am completely new to HD recording but understand p (progressive) and i (interlace) but can cameras be set to record at either and if so what is the ideal (if the player can play either)?

[Ken Berry]

can cameras be set to record at either and if so what is the ideal (if the player can play either)?

AFAIK, any camcorder which can record at the full 50/60P will usually have a setting which will allow it to record at 50/60i -- which is lesser quality than the full P.

A couple of observations on that. The best quality is obviously the full P. And that is fine to use if you are playing your high def video either on your computer or directly via a HDTV which accepts such video via its USB port; or else via a Blu-Ray player which accepts such video on a USB stick or hard drive plugged into the Blu-Ray via USB. I do it all the time via the latter -- or even sometimes simply record, say, 50P AVCHD, to a disc as data and play it on my PS3 which accepts such discs and recognises the video.

But if you are going to make Blu-Ray discs, then the current international standard for that only allows 50/60i video or, curiously enough, 1280 x 720P video. So both types have important purposes to serve...

[jparnold]

Thanks Ken
It is interesting what you say

But if you are going to make Blu-Ray discs, then the current international standard for that only allows 50/60i video or, curiously enough, 1280 x 720P video.

as my Panasonic 42" plasma flat panel has a resolution of 1280 x 720. When I purchased it 5 years ago (I think) most entry level flat panels (mostly plasma) were SD and the high end/more expensive were 1280 x 720, there were NO HD panels at that time. And I think my panel 'upscales' SD to 1280 x 720.

I DO have a Blu-Ray recorder/player which accepts USB memory sticks so I would work in the full p - am I guessing correctly that during rendering I could choose to 'downsize' to 1280 x 720 for burning to Blue-Ray disk or even down to 1024 x 576 16:9 for DVD?

So then is the answer for how many minutes can be recorded to 32GB in highest def 2 hours 40 minutes (I am assuming that is for 1080/50p)?

Please also answer the following question - as It seems that 1080/50p is recorded at 50 fps, do TV's display at 25fps and therefore with an 'input' of 60fps during editing you could slow it to 25fps and thus achieve (half speed) slow motion better? If so can this be easily achieved with VS?

Lastly what happened to Steve? I haven't seen his name around for a while.

[Ken Berry]

First off, if you are producing 1080P video, there is no real reason to downscale to 720P to burn it to Blu-Ray. Any loss in quality in burning to 1080i would probably be not much different to the loss in downscaling from 1080P to 720P. But try both out and see.

As for 1024 x 576 for a DVD, you have been here long enough to know that the international PAL standard for a DVD is a maximum frame size of 720 x 576. In other words, there is no such thing as 1024 for a standard def DVD.

I can't really answer your question about slow motion as I never use it... Hopefully someone else will.

As for Steve, he signed off from here nearly two years ago (or possibly more??) because of the pressure of work.

[jparnold]

Thanks Ken.

YES I know that DVD is 720x576 but in 16:9 it is referred to as 1024x576 (yes I know that the pixels are stretched).

[Ken Berry]

Curious. In all my days of editing, I have never seen a reference to 1024 when talking about DVDs. Even with 16:9 where, yes,the pixels are non-square or stretched. But maybe I have missed something.

[lata]

Hi Guys

1024 x 576 is referring to the image size for a Pal 16:9 image.

With the project properties set to use Pal 16:9, this is done by default.
Take a screen shot in project playback mode, the resultant image will be 1024 x 576.
This is the square pixel alternative to Pal 720 x 576 pal widescreen.
Ntsc would produce 853 x 480 image.

[erdna]

The 1024 in my calculation does not relate to inage sizes, even not to video issues, but to the units and conversions used to define bits and bytes in storage and datarate (communication) calculations. See e.g. http://www.convertunits.com/from/MB/to/GB

[lata]

Hi

I was not referring to bits and bytes or the file sizes, 1,2, 4, 8, 16,32. 64, 128, 256, 512, then 1024, that’s the way the computer counts.

Pal standard video uses anamorphic 720 x 576, this can be either 4:3 or 16:9 ratio. The video frame is stretched to fill the screen.
If you wish to use an image to fill the screen then square pixels are used, for Pal the standard size for 4:3 would use 768 x 576 for widescreen 16:9 would use 1024 x 576 as the standard Display Resolution.

Quote from http://www.videohelp.com/
Some info on this post
http://forum.videohelp.com/threads/3031 ... broadcasts

Both PAL broadcasts* are 720x576. The only difference between 4:3 or and wide flagged 16:9 is the mapping of the non-square pixels to a display monitor. Assuming a monitor (e.g. computer monitor) with square pixels and no vertical upscale, 4:3 would be mapped to 768x576, 16:9 would be mapped to 1024x576.