1-pass vs 2-pass encoding at DVinfo.net

Go Back   DV Info Net > Cross-Platform Post Production Solutions > Adobe Creative Suite

Adobe Creative Suite
All about the world of Adobe Premiere and its associated plug-ins.


Reply
 
Thread Tools Search this Thread
Old February 21st, 2008, 10:06 PM   #1
Inner Circle
 
Join Date: May 2007
Location: Los Angeles, USA
Posts: 2,109
1-pass vs 2-pass encoding

With Adobe Media Encoder, if I'm encoding MPEG-2 DVD setting all minimum, average, and maximum bit rate to the same value, is it necessary to encode in 2-pass? Will 1-pass give the same result with such bit rate settings?
Taky Cheung is offline   Reply With Quote
Old February 22nd, 2008, 01:19 AM   #2
Regular Crew
 
Join Date: Jan 2008
Location: Ladera Ranch, California
Posts: 115
I can't figure out how to adjust bit rate settings! What's the max bit rate setting you can get, anyway?
Craig Lieberman is offline   Reply With Quote
Old February 22nd, 2008, 01:32 AM   #3
Inner Circle
 
Join Date: Jun 2003
Location: Bergen, Norway
Posts: 2,863
Quote:
Originally Posted by Craig Lieberman View Post
I can't figure out how to adjust bit rate settings! What's the max bit rate setting you can get, anyway?
I'm not sure about the max possible bitrate, but I have great results with the following settings for the video:
(when using Dolby Digital 2.0 audio, set to 224kbps)
Max: 8,700kbps
Average: 8,400
Min: 7,300

In the media encoder window, in the lower right part, you will find the settings for video and audio quality.
Trond Saetre is offline   Reply With Quote
Old February 22nd, 2008, 12:53 PM   #4
Inner Circle
 
Join Date: Jan 2006
Location: Minnesota (USA)
Posts: 2,171
Maximum bitrate for MPEG2 DVD video is 9800kbps. Maximum bitrate for DVD video and audio (combined bitrate) is 10080kbps. If you set minimum, average and maximum bitrates all the same, that's CBR (constant bitrate) and 2 pass encoding is pointless.
Robert M Wright is offline   Reply With Quote
Old February 22nd, 2008, 01:00 PM   #5
Inner Circle
 
Join Date: May 2007
Location: Los Angeles, USA
Posts: 2,109
According to wikipedia, the maximun video+audio bitrate is 9.8mbps.

"DVD-Video discs have a raw bitrate of 11.08 Mbit/s, with a 1.0 Mbit/s overhead, leaving a payload bitrate of 10.08 Mbit/s. Of this, up to 3.36 megabits can be used for subtitles and a maximum of 9.80 megabits can be split amongst audio and video."

http://en.wikipedia.org/wiki/DVD-Video
Taky Cheung is offline   Reply With Quote
Old February 22nd, 2008, 07:33 PM   #6
Inner Circle
 
Join Date: Jan 2006
Location: Minnesota (USA)
Posts: 2,171
I'm not sure how the numbers in the Wikipedia article were arrived at. This is the reference I used:

http://dvddemystified.com/dvdfaq.html
Robert M Wright is offline   Reply With Quote
Old February 22nd, 2008, 07:41 PM   #7
Inner Circle
 
Join Date: May 2007
Location: Los Angeles, USA
Posts: 2,109
I take a look at the link you included. Somewhere in the middle, it said

"After system overhead, the maximum rate of combined elementary streams (audio + video + subpicture) is 10.08."
Taky Cheung is offline   Reply With Quote
Old February 22nd, 2008, 08:36 PM   #8
Inner Circle
 
Join Date: Jan 2006
Location: Minnesota (USA)
Posts: 2,171
In section 3.4, it does say that the maximum bitrate for elementary streams combined is 10.08Mbps. In the same section they state that the maximum bitrate for video is 9.8Mbps. I have seen 9.8Mbps referred to as a maximum for video+audio on other sites. I think they might be confusing the 9.8Mbps maximum bitrate for video as being the maximum for video+audio. Of course, if you have subpictures, then audio+video would be lower than 10.08Mbps (by the bitrate for the subpictures).

I believe the 10.08Mbps total figure is correct, but I have not purchased a copy of the official DVD specifications from the DVD Forum (and don't intend to).

As a practical matter, I never set the maximum bitrate for video and audio combined to over 9.536Mbps (and have never used subpictures) anyway, and haven't had a problem thus far.
Robert M Wright is offline   Reply
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

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. 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 > Cross-Platform Post Production Solutions > Adobe Creative Suite

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 12:58 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network