DVD-video data rate calculations by Matt Ottewill

Try our video data rate calculator (beta)

A utility to help you determine the highest possible video data rate for your DVD.
OSX Mac (1.8Mb ZipMb)
PC (1.7Mb ZipMb)
Shockwave (92Kb)

Why do you need to calculate the video data rate?

DVD-R discs have a limited capacity of 4.37 computer Gb's or 4,700,000,000 bytes. Obviously the total combined files size of all your menus, subtitles, slideshows, buttons, audio and video streams (files) cannot exceed this capacity. Ideally however, you will want to make full use of the storage space the disc offers to present the highest quality sound and images.

As a general, you will find it hard to gain extra space by compressing menus and buttons, and audio streams will not sound good below certain bit rate settings. Once they are all encoded to your satisfaction you will be able to calculate their total combined file sizes. What's left will help you determine the highest quality compression setting to use for encoding your video streams.

When do you need to calculate the video data rate?

Video files of 1 hour or less will not need the maximum possible data rate calculated because even at the highest rate allowed by the DVD specification (9.8Mbps) they will fit on a disc, and remember, this rate isn't recommended anyway because of the maximum bit rate limit .

Once you project exceeds a hour of video you will find it beneficial to calculate the maximum possible video data rate.

Why are the calculation carried out in bytes?

If media file size and storage usage were calculated in kilobytes or megabytes you would have to constantly convert between DVD and computer storage conventions. Calculating in bytes side steps this issue. After all, a byte is a byte! 8-bits. No arguments!

1. You may find late in the authoring process that you have left out an important element that must be added.

2. The process of multiplexing can create extra files over which you have no control.

Leave 5% of your discs capacity as a reserve.

DVD-R .......... 235,000,000 bytes
DVD-9 ........... 427,000,000 bytes
DVD-10 ......... 470,000,000 bytes
DVD-18 ......... 854,000,000 bytes

Continues ...