Difference between SD and DV

[Jeff_NJ]

This may be a stupid question, but my friend has the JVC GR-HD1 and I noticed it allows you to shoot video in HD, SD, or DV. What is the difference between SD and DV? I thought they are the same thing. Thanks.

Jeff

[JohnnyMalaria]

According to the information at B&H Photo:

While the picture is encoded one frame at a time for DV, the time axis is encoded as well for MPEG-2, conforming to the HD Digital VCR Conferences Part 7 (DVB) and Part 8 (ATV) standards. The GR-HD1 uses a GOP (Group Of Pictures) of 6 for HD and 12 for SD, with a frame order of IBBPBB.

In other words, HD and SD are both MPEG2. What's odd is that it can record widescreen in SD MPEG2 but not DV! I have a DV camcorder that records native widescreen. The other difference is that the SD mode records in progressive scan, whereas the DV is interlaced (again, odd, since other DV camcorders exist that do progressive scan).

Personally, I would choose the DV over the SD since DV is better suited for editing. (Actually, I wouldn't even use the HD, which should be called HDV. Real HD is different.)

[pijetro]

I thought SD was simply uncompressed standard definition video..Usually requiring an interface card with SDI connectors to be able to capture the information...
That being said, i was under the impression SD was what broadcast folk to transfer beta to computer with 4:2:2 colour sampling...
And that DV was a compressed version if SD with 4:1:1 sampling...
And that HDV was Mpeg based stream with the same bitrate as DV, to facilitate filesize...

Just a guess though...

[lordsmurf]

B&H is about as unreliable as they come, for information.

They still think a Canopus DV box is a TBC!

[edDV]

I thought SD was simply uncompressed standard definition video..Usually requiring an interface card with SDI connectors to be able to capture the information...
That being said, i was under the impression SD was what broadcast folk to transfer beta to computer with 4:2:2 colour sampling...
And that DV was a compressed version if SD with 4:1:1 sampling...
And that HDV was Mpeg based stream with the same bitrate as DV, to facilitate filesize...

Just a guess though...

SDI is uncompressed serial digital 4:2:2 normally at 270Mb/s 720x480/576 (SMPTE 259m/c) but other variations exist for sqaure pixel 16:9 and HDTV 16:9.

The JVC consumer HD camera will not support SDI in any form.

Here is the spec sheet showing shooting modes
http://www.jvc.com/promotions/grhd1/spec/spec.html

Component analog outputs are
480p / 59.94, 480i / 29.97
720p / 60 fps HD only
1080i / 30 fps

The 1080i output is scaled from 720p, 480p, 480i

[JohnnyMalaria]

See http://www.jvc.com/promotions/grhd1/unprecedent/s_right.html - scroll down to the table that shows all the formats.

Basically supports what the B&H blurb says.

Still don't get the widescreen only being available on the MPEG2 channel, though.

[jmkeuning]

why is smurf baggin on b&h?

I've had no probs with those guys