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Old October 12th, 2006, 09:06 AM   #1
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HDV file size versus DV

Does anyone have a comparison of a file size from a clip from an HD100 with a regular DV clip? I'm trying to compare for buying storage. Isn't the size of the files comparable to regular DV?

I wasn't sure whether to post this in the editing forums or not so if I should've please forgive me.
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Old October 12th, 2006, 01:56 PM   #2
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Native HDV1 (720P) files are actually smaller than their DV counterparts. HDV2 (1080i) are the same size.

DV uses 25Mbps (2.8MB/s), but HDV1 only uses 19.2Mbps (2.3MB/s.)

That translates to approximately 10 Gigabytes per hour for DV or HDV2 (1080i), but only 8.2 Gigabytes per hour for HDV1 (720P).
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Old October 12th, 2006, 06:47 PM   #3
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I actually get closer to 13gb per hour for HDV 1080i.
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Old October 12th, 2006, 11:22 PM   #4
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Both DV and HDV record at 25mbps. Thus, one hour DV or HDV gives you about 13GB file.
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Old October 13th, 2006, 03:04 AM   #5
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Quote:
Originally Posted by Alex Thames
I actually get closer to 13gb per hour for HDV 1080i.
Audio that has been converted to 48Khz 16-bit uncompressed probably accounts for the difference.
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Old October 17th, 2006, 04:29 AM   #6
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DV and HDV 1080i 25 Mb/s

25 Mbits / second
25.600 bits / second
3200 bytes / second
3,125 Mb / second
187,5 Mb / minute
11,250 Gb / hour

if you get 13 Gb/hour it is probably because of the fact
1) Tapes are about 63 minutes
2) This is the actual size of files, size of files on a HDD might be different (1000 - 1024 difference: E.g. 1,5 Gb is not the same as 1 Gb and 500 Mb)

HDV 720p (19,7 Mbits/second with the audio included)

19,7 Mbits / second
20.173 bits / second
2522 bytes / second
2,46 Mb / second
147,75 Mb / minute
8,865 Gb / hour

So, taking everything in account, 1 hour of DV or 1080i HDV is about 11 Gb and 1 hour of 720p HDV is about 9 Gb.

But Brett, remember: if you should use Cineform for the HD intermediate codec, your filesize will shoot up to about 30 GB / hour for HD
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