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Old Sep 9, 2008, 8:20 PM   #1
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Hi all -

I've looked at Nikon's specs, and they dont list a maximum time for AVI video on the D90. I would think it would be limited by buffer size, and not just the size of the memory card used. Nikon's website example video is only ten seconds or so long. Anyone know the limit?

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Old Sep 10, 2008, 6:41 AM   #2
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It's limited to 5 minute clips in HD mode (1280x720), or 20 minute clips in lower resolution modes.

Speculation is that taxes in some regions are influencing this decision (apparently, if a model has the ability to record HD for longer clips, it gets reclassified in some regions for tax purposes). The sensor or other components heating up might also be part of the reason (again, speculation).

For short clips, it's an interesting feature. But, keep in mind that you don't have any Autofocus using it (which could be an issue when using wider apertures since a dSLR will have a much shallower DOF compared to a typical video camera). Sound is also mono versus stereo. So, don't expect to replace a high quality video recorder with it for general purpose use.

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Old Sep 10, 2008, 4:56 PM   #3
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Another factor is that the video format used is MJPEG which is only lightly compressed compared to the AVCHD format used in solid state consumer HD camcorders. 5 minutes of D90 video gives a file size approaching 4 Gb, which is the largest single file that can be stored on an SDHC card. On my HD camcorder a single AVCHD file approaching 4Gb is over 30 minutes of video. Continuous recording on the D90 in HD would mean that multiple clips and thumbails would need to be created - maybe this is the next step?
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Old Sep 10, 2008, 5:19 PM   #4
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1eyedeer wrote:
Quote:
Another factor is that the video format used is MJPEG which is only lightly compressed compared to the AVCHD format used in solid state consumer HD camcorders. 5 minutes of D90 video gives a file size approaching 4 Gb, which is the largest single file that can be stored on an SDHC card.
It's my understanding that a 5 Minute HD clip on a D90 takes just under 600MB of storage space, so the 4GB file size limitation you have using a FAT32 file system shouldn't enter the equation.

Of course, the file system can be a limitation when recording video with the current generation of dedicated video cameras, since FAT32 has a maximum file size of 4GB, and that's the file system you now see being used by most camera manufacturers for memory card sizes over 2GB.

http://en.wikipedia.org/wiki/File_Allocation_Table

For other cameras that do need a way to store files larger than 4GB without splitting up clips into multiple files, Microsoft has a new ExFAT system that I expect them to try and market (and support for it was included in Vista SP1).

http://en.wikipedia.org/wiki/ExFAT

Personally, I'd prefer an open source alternative, since Microsoft has a tendency to try an extract licensing fees for their file systems, if you remember the legal fiasco with them wanting to charge memory card manufacturers for formatting cards using FAT.

http://en.wikipedia.org/wiki/File_Al...#FAT_licensing

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Old Sep 25, 2008, 10:09 PM   #5
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From the D90 user manual:

Quote:
Maximum Size
Movie files can be up to 2 GB in size. The maximum length is 5 min for movies with a
frame size of 1280 × 720, 20 min for other movies
; note that depending on memory card
write speed, shooting may end before this length is reached.
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Old May 17, 2010, 12:51 PM   #6
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Quote:
Originally Posted by TeknoSmurf View Post
From the D90 user manual:
Yes, that is what it says on page 50, but on page 51, the third paragraph says, "Live view can be used to record movies for up to an hour." Apparently, we are left to work out for ourselves what the real limitations might be, and whether or not any workarounds are worth the effort.
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