Problem with bitrate..

[The haltman]

Hi!
I have an AVI file with AC3 audio, I have converted it to MPG2 with TMPGenc to create a DVD when I have imported on DVD lab the audio and video file I noted that the DVD result 4.7 Gb to calculate the exact bitrate I have used the calculator of the site, to reduce the file size I suppose I must reduce the bitrate but how to calculate it?

thanks in advance.
haltman

[Forum Troll]

If your final authored size is too big to burn, you can use DVD Shrink to make it smaller.

[The haltman]

If I have understood right I must prepare the image to burn with DVD Lab and after compress with DVD Shrink is it right?

[jyn999]

Yes. Have DVDShrink read the fully authored files.

[The haltman]

But in general what is the rules to calculate the right bitrate there is only one bitrate or I can choose one to optimize the size?

thanks haltman

[bugster]

But in general what is the rules to calculate the right bitrate there is only one bitrate or I can choose one to optimize the size?

thanks haltman

The size of an mpge file is determined by the playing time and the bitrate. To determine what bitrate to use to achive a particular file size for a specific playing time, use a bitrate calculator such as the one here .

Note this is only good if you encode using CBR or n-pass VBR modes. In the VBR mode, the bitrate calculator determines the AVERAGE bitrate to specify. If you use quality based encoding methods such as TmpGenc's CQ mode, a bitrate calculator is of little use and determining the final file size in advance is very difficult and unreliable.
Also, don't forget to allow for the audio and allow a small overhead for DVD authoring data.

[The haltman]

So the better way may be to use the bitrate calculator from the site encode with tmpgenc create an image with DVD Lab and if is too big the result file compress it with DVD shrink.. a little long but possible..