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Compression Suggestions

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Brian Loughner
Compression Suggestions
on Aug 18, 2010 at 3:48:14 pm

Hello,

Unfortunately, or fortunately, I have been put on a video project that I need some help on.

I am using a mac running OSX 10.6.4 with a quad core 2.66 and 8gb ram.

Using FCP 7.0.2, compressor 3.5.2 and DVDSP 4.2.2. All of which I believe are the latest versions.

The video footage was taken off an XDCAM 50mbs tape, and using the XDCAM software, ripped and wrapped in quicktime (.mov) MPEG-2.

Video footage is 720x486, 16:9, 29.97 fps.

I hope that gets everything out of the way...

Here is my issue. I have 4 volumes (66mins, 60mins, 44mins, 51mins) that I need on either 2 or 3 DVDs. I cannot split up the volumes in half, they are complete projects and need to stay intact. I have the ability to use DVD-9 and DVD-5s. How would you break this project up? would you put 2 volumes on a dvd-9 so you have 2 dvds?

also: How would you change the compressor settings from the standard "DVD: Best Quality 90 minutes" to get the best quality because it is only compressing 60 minutes? I know that increasing the bitrate above 7ish will give DVD players issues. What else would you change?

Is there a formula you guys use to help you figure this stuff out (based on video length)? any suggestions would be very helpful!

Thanks a lot.


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Chris Blair
Re: Compression Suggestions
on Aug 19, 2010 at 12:55:32 pm

If you used dual-layer you could fit all four on one disc if you kept the compression to around 6 Mb/sec. That would be 221 minutes or 13260 seconds x 6 Mb (6000kb/sec) = roughly 7.9GB.

There's a DVD bitrate calculator on the videohelp.com site here that will give you a range of acceptable bit-rates you can use to fit your content on various disc sizes:

http://www.videohelp.com/calc.htm

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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Brian Loughner
Re: Compression Suggestions
on Aug 19, 2010 at 5:58:38 pm

Chris,

Thanks for your response.

Any quick words on setting up the DVD layer break?


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Chris Blair
Re: Compression Suggestions
on Aug 20, 2010 at 2:13:29 am

No...not really...from what I've read there is usually a pause of from a half-second to several seconds as the laser transitions from the top layer to the bottom layer. I don't know of any way to predict or reliably know where that will occur on the disc...so the only solution there would be to NOT use dual-layer and put two volumes each on a DVD-5 disc.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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Craig Seeman
Re: Compression Suggestions
on Aug 20, 2010 at 2:38:43 am

I think ideally you try to find a natural break point so it's not as noticeable. It would happen on the nearest I frame. At the end of a fade to black or on a still if there are any might be options.



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