Best compression setting 90min movie on Dual Layer DVD

Okay, I admit, I am a total n00b at this...so sorry if you have to break things down into the most basic terms...
I am trying to get the BEST quality I can for my adobe Encore project (for ease of calculation, 90min movie and added features). I was previously getting "exceeds dvd capacity" error in Encore.
I have decided to recompress and see what I can do to make it all fit, but first I want to re-evaluate my whole process...
the ultimate issue comes down to three things (i think)...
1. CBR v VBR?? what is better and why?
2. What Data Bit Rate to compress at and why?
3. Single layer DVD vs Dual Layer DVD? Which is better and why?
to begin the discussion, I'll tell you what I "know" and what I think.
It seems DVD players can only handle a max bit rate of 8mbps so I don't want to go over that and using a Dual layer disc I risk that it may not work on older players....also, the dual layer costs twice as much to duplicate (this sucks but money is not an issue at this point, quality is more important). From what I have read, constant Bit Rate @ 8mbps will give me the Best possible image... 8 is the max and so to encode at 8 the entire time should be the best.. will i have any issues with this? This is not an amateur home movie but rather an indie feature film so I want to get the best possible viewable product out to people. I will have blu-ray questions to come later (thats what we are going to send to festivals).
any help would be greatly appreciated
thanks so much...
chris

Okay, thanks for everyone's thoughts.
Question....
I totally understand not wanting to waste space on a dvd IF there was extra room.... HOWEVER, a movie at 90min with menus, etc. BARELY fits on a dvd at a 6.8mbps VBR compression rate....
therefore....why not just fork out the extra couple bucks and just compress the whole thing at 8.0mbps 2pass CBR, slap it on a dual layer and even though there will be parts of the movie that will be higher than necessary, and there will be leftover space on the dual layer dvd.... you will be guaranteed to have the highest quality right? heavy motion areas and more static areas will all be encoded at 8 and thus, the best....
am i wrong in thinking this?
and after some extensive reading and research....Although is says a dvd player can handle 9.8mbps..... it doesnt' seem safe to encode that high because a lot of players can't handle it.... what is everyone else's thoughts?
I found this:
Data rate
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 Mbit/s can be used for subtitles and a maximum of 9.80 Mbit/s can be split amongst audio and video. In the case of multiple angles the data is stored interleaved, and so there's a bitrate penalty leading to a max bitrate of 8 Mbit/s per angle to compensate for additional seek time. This limit is not cumulative, so each additional angle can still have up to 8 Mbit/s of bitrate available.
Professionally encoded videos average a bitrate of 4-5 Mbit/s with a maximum of 7–8 Mbit/s in high-action scenes. This is typically done to allow greater compatibility amongst players, and to help prevent buffer underruns in the case of dirty or scratched discs.

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Hi All,
I am having some trouble making a useable DVD. I have a video that I recorded and imported into iMovie (2h33m long). I exported it to iDVD, which told me that I needed to use a dual layer DVD to make it fit. Here's where I noticed the first problem: iDVD has one option for a dual layer disc, stating that it has 7.7GB storage space, and my discs have 8.5GB. I set it to use the standard setting for the DL disc any ways, turned the quality down a bit to make it fit, and burned the DVD. After burning two discs, I still do not have one that works. It comes up as "supported disc not available" on my Mac, and as a blank disc on any other machine I put it in. It will run on my coworker's brand new iMac, but that is the only one. Am I doing something wrong? The only mistake that I have corrected since I have tried all this is changing the aspect ratio back from 4:3 to 16:9 in iMovie (I am not sure how that happened, as the video was originally recorded in 16:9). I am re-exporting the file to my desktop now in the proper ratio, and changed the quality to HD. I am waiting for the file to encode as we speak. Any help would be greatly appreciated, as this work is for my local school board and is very time sensitive.
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I set it to use the standard setting for the DL disc any ways, turned the quality down a bit to make it fit, and burned the DVD.
That part I don't understand.
iDVD encoding settings:
http://support.apple.com/kb/HT1502?viewlocale=en_US
Short version:
Best Performance is for videos of up to 60 minutes
Best Quality is for videos of up to 120 minutes
Professional Quality is also for up to 120 minutes but even higher quality (and takes much longer)
That was for single-layer DVDs. Double these numbers for dual-layer DVDs.
Professional Quality: The Professional Quality option uses advanced two-pass technology to encode your video (The first pass determines which parts of the movie can be given greater compresson without quality loss and which parts can’t. The second pass then encodes those different parts accordingly) , resulting in the best quality of video possible on your burned DVD. You can select this option regardless of your project’s duration (up to 2 hours of video for a single-layer disc and 4 hours for a double-layer disc). Because Professional Quality encoding is time-consuming (requiring about twice as much time to encode a project as the High Quality option, for example) choose it only if you are not concerned about the time taken.
In both cases the maximum length includes titles, transitions and effects etc. Allow about 15 minutes for these.
You can use the amount of video in your project as a rough determination of which method to choose. If your project has an hour or less of video (for a single-layer disc), choose Best Performance. If it has between 1 and 2 hours of video (for a single-layer disc), choose High Quality. If you want the best possible encoding quality for projects that are up to 2 hours (for a single-layer disc), choose Professional Quality. This option takes about twice as long as the High Quality option, so select it only if time is not an issue for you.
Use the Capacity meter in the Project Info window (choose Project > Project Info) to determine how many minutes of video your project contains.
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And whilst checking these settings in iDVD Preferences, make sure that the settings for NTSC/PAL and DV/DV Widescreen are also what you want.
http://support.apple.com/kb/HT1502?viewlocale=en_US

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>The DVD plays properly on my cheap sony player, but both my toshiba and humax/tivo players failed to read the disc. (multiple tries/burns....or coasters, now) I've read that there are common problems with dual layer +R.
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Creating a disc image of a project
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Click Save.
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I want to burn my movie onto a dual layer DVD. There is a selection in DVDSP4 for dual layer, but how do I prep it for a lower compression/dual layer option in Compressor?

Not necessarily - passes impact the encode time, the first pass is a test encode, the second one is the real thing (think of it has a rough draft). It has nothing to do with whether you're using single or dual layer media.
It shouldn't change size in DVDSP - once the file is encoded that's it - it's going to stay that size no matter what. If its coming out at 4.7 GB you may be able to get away with single layer media.
Message was edited by: wallybarthman

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I'm a new FCP user of a few months and DVDSP of one week.
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Best compression setting 90min movie on Dual Layer DVD

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