dc coeffieient and hi8>DV at DVinfo.net

Art Willig · July 5th, 2012, 05:02 PM

I'm making a DVD from a marginal source hi8 capped in DV.
I believe the dc coefficient default is 9 but read to use 10.
What is the dc coefficient and should I use 8, 9, or 10 when dealing with hi8>DV>mpg?
Thx

Jon Shohet · July 6th, 2012, 04:25 AM

I won't pretend to fully understand the complex technical explanations of how MPG compression works. Wikipedia, doom9 and videohelp.com should be great starting points if you want a deeper understanding.

The crude bottom line is that higher DC Precision = Higher quality of encoding, BUT it requires a higher bitrate. So if you use a high precision setting with too low a bitrate you may actually end up with worse quality.

The general consensus AFAIK is to use 10 for bitrates > 6000, 9 for bitrates 4000-6000, 8 for <4000.
Of course you should probably make your own tests...

Art Willig · July 11th, 2012, 02:51 PM

Thanks for the explaination. I used 10 for mpgs at 8000 kbps and it's a bit clearer (no pun intended).

July 5th, 2012, 05:02 PM	#1
Art Willig Regular Crew Join Date: Feb 2007 Location: Colorado Posts: 104	dc coeffieient and hi8>DV I'm making a DVD from a marginal source hi8 capped in DV. I believe the dc coefficient default is 9 but read to use 10. What is the dc coefficient and should I use 8, 9, or 10 when dealing with hi8>DV>mpg? Thx __________________ "Shoot first and ask questions later"

July 6th, 2012, 04:25 AM	#2
Jon Shohet Major Player Join Date: Dec 2007 Location: London, UK Posts: 277	Re: dc coeffieient and hi8>DV I won't pretend to fully understand the complex technical explanations of how MPG compression works. Wikipedia, doom9 and videohelp.com should be great starting points if you want a deeper understanding. The crude bottom line is that higher DC Precision = Higher quality of encoding, BUT it requires a higher bitrate. So if you use a high precision setting with too low a bitrate you may actually end up with worse quality. The general consensus AFAIK is to use 10 for bitrates > 6000, 9 for bitrates 4000-6000, 8 for <4000. Of course you should probably make your own tests...

July 11th, 2012, 02:51 PM	#3
Art Willig Regular Crew Join Date: Feb 2007 Location: Colorado Posts: 104	Re: dc coeffieient and hi8>DV Thanks for the explaination. I used 10 for mpgs at 8000 kbps and it's a bit clearer (no pun intended). __________________ "Shoot first and ask questions later"