Is it possible to "recompress" a compressed file?

Hi, all. A couple of years ago I made a project in iDVD and archived it to a .img file thinking I'd never have to see it again. Well, lo and behold I've been asked for a copy of that project. The problem is the .img file is 5.08 GB, too large for a standard single-layer DVD-R. (I'm not sure how this project could possible have burned to a single-layer DVD in the first place, but that's a mystery for another day).
Anyway, does anyone know of a way to "recompress" this 5.08 GB .img file for use on a SL DVD, or do I need to get a double-layer DVD-R?

Great !
You can extract the video and audio streams from the DVD image and re-encode just your audio to make all fit in a DVD5 without quality loss.
Do as follows:
- Use the free MPEG Streamclip to extract the MPEG2 video stream and the AIFF audio.
- Use COmpressor to encode the AIFF audio to Dolby 2 (AC3). Use any of the standard Dolby 2 presets from Compressor and change the following settings in the Dolby preset:
* Dialog Normalization: -31
* Compressor preset: None
- Create new DVDSP project and import the MPEG2 video and AC3 audio into a track and author your DVD.
You video will be untouched and you audio will be fine. You'll have to create a Menu if you want or just leave the track as First Play.
Hope that helps !
Alberto

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I suspect you had an error in your process. In particular, make sure that no new files were created while making changes and that the changes were made properly.
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