HD-SDI vs HDMI at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > External Video Recording Solutions > Convergent Design Odyssey

Convergent Design Odyssey
...and other Convergent Design products.

Thread Tools Search this Thread
Old July 26th, 2012, 12:08 AM   #1
Major Player
Join Date: Nov 2005
Posts: 382

With regards to the nanoflash (or even other recorders), what are the advantages or disadvantages to recording from the HD-SDI output rather than the HDMI output of a camcorder ? I am familiar with the data rate of HD-SDI, but have no idea what the HDMI output looks like.
Mark Donnell is offline   Reply With Quote
Old July 26th, 2012, 03:14 AM   #2
Regular Crew
Join Date: Jun 2011
Location: Germany
Posts: 176

The advantage of SDI is the locking connector and that most of the pro gear can be plugged in.

In most every other aspect - from bandwidth to features - HDMI blows SDI out of the water.

Frank Glencairn is offline   Reply With Quote
Old July 26th, 2012, 05:19 AM   #3
Inner Circle
Join Date: Dec 2005
Location: Bracknell, Berkshire, UK
Posts: 4,957

Timecode is not standard with HDMI :-( You can run HDSDi up to 100m with good quality cables, not that you'd normally put a recorder that far away. HDMI tends to exhibit more lag and signal delay than HDSDi.
Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com
Alister Chapman is offline   Reply With Quote
Old July 26th, 2012, 08:10 AM   #4
Join Date: Mar 2002
Location: Ann Arbor, MI
Posts: 1,325

It depends on what you're doing. I love HDSDI and our switcher and capture computer are well over 100' away from any camera in our studio, but there have been no issues even up to 300 ft. A BNC with two wires (shield and conductor) either works or not and carries component digital video, multi track audio (16 vs HDMI's 8 channels) and timecode.

If the coax cable does not work or is intermittent, I can cut the end off and put a new BNC on it in under 5 minutes. Try that with HDMI.

HDMI copper cable length goes 50' (some claim 100 ft.) with heavy duty cables, but then you've got a thick cable, that can produce a lot of torque, inserted into a weak - sometimes motherboard-mounted connector with lots of pins. Lots of people have had their gear's HDMI's connectors go bad and their shoot shot. The HDMI connector is not locking - really bad. Did I mention how many pins are inside there that may be needed to pass signal or you've got a problem? 19 or even as many as 29! One word - yuck.

If the HDMI connector gets mangled, that expensive thick cable is close to toast because very few want to take on the horrid task of re-connectorizing it - not me brothers.

Don't get me wrong. HDMI is great for a lot of stuff, and 1.4 can carry 4K,
but imo, I would avoid it if possible for use on set.

As always, YMMV.
Jacques Mersereau
University of Michigan-Video Studio Manager
Jacques Mersereau is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

Omega Broadcast
(512) 251-7778
Austin, TX

(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

(800) 238-8480
Glendale, CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > External Video Recording Solutions > Convergent Design Odyssey

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 05:15 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network