HDV file size versus DV at DVinfo.net

Brett Ward · October 12th, 2006, 08:06 AM

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.

Tim Dashwood · October 12th, 2006, 12:56 PM

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).

Alex Thames · October 12th, 2006, 05:47 PM

I actually get closer to 13gb per hour for HDV 1080i.

Peter Robert · October 12th, 2006, 10:22 PM

Both DV and HDV record at 25mbps. Thus, one hour DV or HDV gives you about 13GB file.

Tim Dashwood · October 13th, 2006, 02:04 AM

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.

Werner Wesp · October 17th, 2006, 03:29 AM

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

October 12th, 2006, 08:06 AM	#1
Brett Ward New Boot Join Date: May 2006 Location: Charleston, WV Posts: 5	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.

October 12th, 2006, 12:56 PM	#2
Tim Dashwood Wrangler Join Date: Aug 2005 Location: Toronto, ON, Canada Posts: 3,637	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). __________________ Tim Dashwood

October 12th, 2006, 05:47 PM	#3
Alex Thames Major Player Join Date: Feb 2006 Location: New York Posts: 508	I actually get closer to 13gb per hour for HDV 1080i.

October 12th, 2006, 10:22 PM	#4
Peter Robert Regular Crew Join Date: Oct 2003 Location: Singapore Posts: 70	Both DV and HDV record at 25mbps. Thus, one hour DV or HDV gives you about 13GB file.

October 17th, 2006, 03:29 AM	#6
Werner Wesp Major Player Join Date: Aug 2005 Location: Belgium Posts: 497	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