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single vs dual layer

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Bill McCallum
single vs dual layer
on Feb 20, 2008 at 10:31:25 pm

I have a project that is 1:55 long. That is awfully close to the two hour limit for a 4.7GB disk. Will it look better if it is burned to a dual layer disk?


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Shawn Michael Lee
Re: single vs dual layer
on Feb 21, 2008 at 4:05:26 pm

For a 115 minute video with Dolby Digital 2.0 Audio, you would encode at 4.96 Mbps. This assumes a 1% overhead and NO MENUS. With Menus, this is less.

A 4.96Mbps video can look perfectly fine depending on the amount of motion in the video. If it's just a talking head, interviews, static shots, by all means do it all on a single layer.

However, if you are looking at quick cuts, fast action, pans/zooms, dollys, lots of dissolves, etc., go with a dual layer and encode at 8.25Mbps.

Reminder: Do not use PCM audio. Use Dolby Digital 2.0. Huge size difference.

Hope that helps.



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Simon Bonner
Re: single vs dual layer
on Feb 24, 2008 at 4:49:06 pm

Excuse me for piggy-backing on this thread, but Shawn: How would I specify PCM / Dolby in Encore? I assumed that whenever I transcoded, my WAV files were trancoded too. Have I missed something? Having read this I am wondering if I am unintentionally compromising on image quality.

Simon Bonner

youtube.com/simonsaysFX


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Shawn Michael Lee
Re: single vs dual layer
on Feb 25, 2008 at 5:19:19 pm

Hi Simon,

Good Question. In CS3, it is in the Advanced tab when you begin a new project. In 2.0 it's, Edit/Preferences/Encoding. In CS3 Dolby Digital is the default. In 2.0, PCM is the default.

You probably aren't compromising too much in image quality unless you are really close to the limit of the disc. But for a comparison, a PCM/wav file is roughly 8x larger than a Dolby Digital/AC3 file. So a two hour piece that has a PCM file would require you to encode video at 3.46Mbps. This is below the recommended 4.0Mbps and will look terrible. On the flip side, a 2 hour piece with 2 channel, AC3 audio would encode the video at 4.75Mbps. Better, but not great. Even at 5.1 channel AC3, you could encode at 4.5 with no problems.

BTW: stay away from MPEG II encoding. I don't know why they even include that option anymore. So buggy with settop players.



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