Mixing 4/3 and 16/9 footage and other, using DVDA at DVinfo.net

Phil Gosselin · June 29th, 2009, 06:01 PM

Hi all,

Very soon I will need to create a dvd with a mixture of videos, some we shot and some that were shot 5 years ago.

Ours are of HDV sources downgraded to DVD resolution and the others are 720x480 widescreened.

How could I go into DVDA to make such a project. As I understand you can only set a project to be in either 16/9 or 4/3.

Will it automatically detect the differences and apply settings accordingly or...

****
My other concern is related to bitrate. Since I will have either 12 or 8 videos per DVD they will have to be compressed to fit into the DVD.

Is it wiser to encode out of Vegas with a medium bitrate so that DVDA won't have to reencode them again OR render at full quality out of Vegas and let DVDA do it's thing?

Thanks

Philippe

Seth Bloombaum · June 30th, 2009, 09:23 AM

Quote:

Originally Posted by Phil Gosselin

...Very soon I will need to create a dvd with a mixture of videos, ... of HDV sources downgraded to DVD resolution and the others are 720x480 widescreened.

How could I go into DVDA to make such a project. As I understand you can only set a project to be in either 16/9 or 4/3.

None of these are 4/3 sources? Or, put another way, when you are done with your project, everything you've listed will be 720x480 widescreened. That's the only proper way to get 16/9 material on DVD.

Quote:

...My other concern is related to bitrate. Since I will have either 12 or 8 videos per DVD they will have to be compressed to fit into the DVD.

Is it wiser to encode out of Vegas with a medium bitrate so that DVDA won't have to reencode them again OR render at full quality out of Vegas and let DVDA do it's thing?

Everything is compressed to fit on a DVD, since the maximum working video bitrate of apx. 8Mbps is about 1/3 the bitrate of DV or HDV.

Letting DVDA do the compression is the easiest, but with experienced hands somewhate better quality can be had rendering out of Vegas. Mistakes made with Vegas rendering can lead to *very* poor results - if the bitrate is too high, if it is the wrong format, or, if DVDA doesn't think it will fit on the disk, DVDA rerenders.

The basic rules of thumb for Vegas DVD renders are:
*Use AC-3 audio encoding (a separate but quick rendering pass in Vegas).
*Use the Mainconcept MPEG2 for DVDA template. Adjust parameters by clicking "Custom"
*Use variable bitrate (VBR) encoding with max 8Mbps for up to 70 minutes of material.
*Use a bitrate calculator or chart for total video lengths over 70 minutes. Most people consider 90 minutes to be the max for mixed content, but 2 hours or more is possible with low-motion content.

Edward Troxel's excellent newsletters are a wonderful source of Vegas info. Though some of the basic stuff was written for earlier versions, not much has changed.

And get thee to the Vegas forum! Most DVDA questions seem to be over there, not over here...

Phil Gosselin · July 21st, 2009, 05:58 PM

These are pretty good pointers, thanks Seth!

I guess I will have to play around with the settings before I get the results I need. I now have 18 videos to fit on the DVD but I am sure they will end up with a 2-2.5 mgb bitrate which more than adequate.

Concerning the first question I think I saw a problem when there was none, all materials are widescreened so it doesn't really matter of the source resolution is not the same, I won't have to crop anything.

Cheers,

Philippe

June 29th, 2009, 06:01 PM	#1
Phil Gosselin Regular Crew Join Date: Sep 2006 Location: Montreal, Canada Posts: 90	Mixing 4/3 and 16/9 footage and other, using DVDA Hi all, Very soon I will need to create a dvd with a mixture of videos, some we shot and some that were shot 5 years ago. Ours are of HDV sources downgraded to DVD resolution and the others are 720x480 widescreened. How could I go into DVDA to make such a project. As I understand you can only set a project to be in either 16/9 or 4/3. Will it automatically detect the differences and apply settings accordingly or... **** My other concern is related to bitrate. Since I will have either 12 or 8 videos per DVD they will have to be compressed to fit into the DVD. Is it wiser to encode out of Vegas with a medium bitrate so that DVDA won't have to reencode them again OR render at full quality out of Vegas and let DVDA do it's thing? Thanks Philippe

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July 21st, 2009, 05:58 PM	#3
Phil Gosselin Regular Crew Join Date: Sep 2006 Location: Montreal, Canada Posts: 90	These are pretty good pointers, thanks Seth! I guess I will have to play around with the settings before I get the results I need. I now have 18 videos to fit on the DVD but I am sure they will end up with a 2-2.5 mgb bitrate which more than adequate. Concerning the first question I think I saw a problem when there was none, all materials are widescreened so it doesn't really matter of the source resolution is not the same, I won't have to crop anything. Cheers, Philippe