Quality benefits of uncompressed? at DVinfo.net

Trevor Allin · July 7th, 2006, 08:39 AM

Hi

Does anyone know what the acctual quality gain is if you capture uncompressed rather than HDV. I mean image for image is there much difference to the eye?

Thanks

Trevor

Adam Oas · July 7th, 2006, 08:59 AM

Are you asking about running off of the Camera's YRB outputs? There is some gain to be had by that, in that you are skipping a lossy MPEG2 step, but you're tethered to a expensive deck

After recording to tape simple answer is that; for straight video, there is no gain. You can't get more information than was actually recorded onto the tape.

However, if you are adding graphics or doing any sort of compositing, adding effects, layers, transitions, what have you... You can benefit from the increased quality of an uncompressed codec.

Paolo Ciccone · July 7th, 2006, 09:05 AM

Trevor.
Keep in mind that the HD100 doesn't give you uncompressed signal, even when using Component out. That output gives you a "less compressed" signal, one that is not so crushes as the HDV one. An uncompressed signal would give you 4:4:4 color representation, component out gives you 4:2:2 instead of 4:2:0. That's the main advantage and yes, you can see the difference.
In addition, the better color coding gives you a better starting point for chromakey.

David Ziegelheim · July 7th, 2006, 03:57 PM

Is that the same for the other cameras in the shootouts or do they provide uncompressed output?

Stephan Ahonen · July 7th, 2006, 05:02 PM

Calling an analog signal 4:anything:anything is not entirely accurate, since those numbers are referring to digital sampling rates. It's all dependent on the digital sampling rate of the deck you use to capture. Also, 4:2:2 can still be considered "uncompressed."

Trevor Allin · July 8th, 2006, 01:13 AM

Hi thanks for the replies.

I notice that DV Rack will capture 422 shortly but only through firewire. Anyone know how to convert from component to firewire?

Thanks

Trevor

July 7th, 2006, 08:39 AM	#1
Trevor Allin Regular Crew Join Date: Sep 2005 Posts: 152	Quality benefits of uncompressed? Hi Does anyone know what the acctual quality gain is if you capture uncompressed rather than HDV. I mean image for image is there much difference to the eye? Thanks Trevor

July 7th, 2006, 09:05 AM	#3
Paolo Ciccone Trustee Join Date: Apr 2005 Location: Santa Cruz, CA Posts: 1,116	Trevor. Keep in mind that the HD100 doesn't give you uncompressed signal, even when using Component out. That output gives you a "less compressed" signal, one that is not so crushes as the HDV one. An uncompressed signal would give you 4:4:4 color representation, component out gives you 4:2:2 instead of 4:2:0. That's the main advantage and yes, you can see the difference. In addition, the better color coding gives you a better starting point for chromakey. __________________ Paolo http://www.paolociccone.com Demo Reel

July 7th, 2006, 08:59 AM	#2
Adam Oas Regular Crew Join Date: Jun 2006 Location: Fort Worth TX Posts: 69	Are you asking about running off of the Camera's YRB outputs? There is some gain to be had by that, in that you are skipping a lossy MPEG2 step, but you're tethered to a expensive deck After recording to tape simple answer is that; for straight video, there is no gain. You can't get more information than was actually recorded onto the tape. However, if you are adding graphics or doing any sort of compositing, adding effects, layers, transitions, what have you... You can benefit from the increased quality of an uncompressed codec.

July 7th, 2006, 03:57 PM	#4
David Ziegelheim Major Player Join Date: Jul 2003 Location: Warren, NJ Posts: 398	Is that the same for the other cameras in the shootouts or do they provide uncompressed output?

July 7th, 2006, 05:02 PM	#5
Stephan Ahonen Major Player Join Date: Apr 2005 Posts: 512	Calling an analog signal 4:anything:anything is not entirely accurate, since those numbers are referring to digital sampling rates. It's all dependent on the digital sampling rate of the deck you use to capture. Also, 4:2:2 can still be considered "uncompressed."

July 8th, 2006, 01:13 AM	#6
Trevor Allin Regular Crew Join Date: Sep 2005 Posts: 152	Hi thanks for the replies. I notice that DV Rack will capture 422 shortly but only through firewire. Anyone know how to convert from component to firewire? Thanks Trevor