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24, 30 minute audio lessons on a DVD-5?

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dax702
24, 30 minute audio lessons on a DVD-5?
on Nov 3, 2006 at 8:56:05 pm

Here's what I'm trying to do, tell me if this is possible or not?

I have 24, 30 minute audio lessons that I'd like to put on one DVD-5.
Each lesson will have a PDF file that goes with it (in an extra folder on the DVD)

Now I know I couldn't possibly accomplish this with any video as it would be far too big in size.

My questions:

1) How many hours of AC-3 audio can I fit on the DVD-5?

2) Would it be possible to have a DVD menu, with links to the lessons. When they click on the link, it could take them to say just an image telling them where to find the PDF for that lesson... Or maybe just a submenu with the background audio of that menu being the actual lesson?


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Joe Bowden
Re: 24, 30 minute audio lessons on a DVD-5?
on Nov 4, 2006 at 6:04:26 pm

You'll be pushing the boundaries, but it should be possible.

720 minutes (12 hrs) of audio will fit on a single DVD-5 if you encode it at 96 kbps (4,147,200,000 bytes). Audio quality will be fairly poor, which might not be so much of an issue if they are all lectures/lessons. This leaves you about 552,800,000 bytes free.

You would want to put each audio clip into its own timeline, and create a still frame for the video if you want any video information. Each still will take up at most a few hundred kilobytes. Menus will be about 50 KB each.

Provided your PDF files are not too large, it should be possible. Another word of advice: SaveAs the project often.


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dax702
Re: 24, 30 minute audio lessons on a DVD-5?
on Nov 5, 2006 at 1:22:25 am

Hmm now I'm really confused as I read this on dvddemystified.com:

"A DVD-5 with only one surround stereo audio stream (at 192 kbps) can hold over 55 hours of audio. A DVD-18 can hold over 200 hours." http://www.dvddemystified.com/dvdfaq.html

Big difference between 12 hours (96kbps) and that be considered pushing the boundaries, and over 55 hours at 192kbps...

Am I missing something here? Here is how I checked that 55 hours thing:

192,000bps x 60 secs = 11,520,000bpm (bits per minute)

11,520,000bpm x 60 mins = 691,200,000 bits per hour x 8 bits per byte = 86,400,000 bytes per hour

4,699,979,766 total bytes on DVD-5 / 86,400,000 bytes per hour = 54.4 hours of 192kbps audio

Is that calculation correct or?

Aside from that, when you say "create a still frame for the video," If I create a still frame, won't it still get encoded as video? I've never worked with stills before so I'm not too sure...



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Joe Bowden
Re: 24, 30 minute audio lessons on a DVD-5?
on Nov 5, 2006 at 2:53:22 am

Sorry dax, I made a critical error in my calculation- I forgot to convert my bits and bytes. I thought it seemed wrong as I typed. I can only claim a marked lack of coffee before replying in my defense. :)

An easier calculation would be 4,700,000,000 bytes converted to bits is 37,600,000,000 bits divided by the desired audio bit rate (192,000) = 195,833 seconds/60 = 3263 minutes/60 = 54.4 hrs on a DVD-5.

So your 24 30 minute audio tracks combine to 43,200 seconds. At 192 kbps, that will take 8,294,400,000 bits or 1,036,800,000 bytes. About a quarter of the disc for the audio.

Regarding the still, Encore exports each as an MPEG I-frame with duration. It will be markedly smaller than video of the same duration.



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