DVD Shrink

A dual layer disc holds roughly twice what a single layer one does, which was the problem this software existed to solve. Fitting the first onto the second means removing about half the data, and doing that without the result looking dreadful is harder than it sounds. DVD Shrink was built around that single arithmetic problem.

The obvious approach is compressing everything proportionally, and it is also the worst one. Squeeze a two hour film plus menus, extras, commentary tracks and six subtitle languages into half the space and every part of it suffers equally, including the part you actually wanted.

The better approach is the one this tool made accessible, which is deciding what to keep before deciding how hard to compress.

Re-authoring beats compressing

The DVD Shrink analysis view shows what the disc contains as separate elements. The main feature, each extra, each audio track, each subtitle stream, with the space each occupies.

Reading that list is usually a revelation. The film is frequently a fraction of the disc, with the remainder going to menus, trailers, a making-of documentary, three commentary tracks and subtitles in languages nobody in the household reads.

Re-author mode builds a new disc from a chosen subset. Take the film and one audio track, drop everything else, and the compression required to fit the target size falls dramatically or disappears entirely. A film that would have looked poor at heavy compression looks close to the original at light compression, because the space went to the film rather than to the extras.

That trade is the whole skill, and understanding it is worth more than any setting.

The compression itself

Where compression is still needed, quality depends on how the available data is distributed, and the DVD Shrink deep analysis pass exists for that.

A quick pass allocates roughly. The slower analysis examines the video first and assigns more data to complex scenes and less to simple ones, which is why a well-analysed compression at a given ratio looks noticeably better than a hasty one. On a long film the difference between the two is visible in exactly the scenes people care about, meaning fast motion and dark detail.

The practical guidance follows from that. Below a certain ratio the result is fine, beyond it the picture visibly softens, and the answer to heavy compression is dropping content rather than accepting the softness.

It stops before the disc

DVD Shrink produces a folder or a disc image rather than a burned disc, and the burning is somebody else’s job.

That separation is sensible rather than a limitation, since burning is a solved problem handled well by dedicated software. ImgBurn writes the result, and it remains the tool most people reach for when an image needs to become a disc.

For working with the resulting image without burning anything, ISO Workshop extracts from it or converts it to another format.

The legal position, stated plainly

This needs saying rather than being left implied, because it is the reason DVD Shrink stopped being developed.

Commercial discs carry copy protection, and reading their contents involves circumventing it. That circumvention is unlawful in a good number of countries regardless of whether you own the disc and regardless of what you intend to do with the copy. Personal backup provisions exist in some jurisdictions and generally do not extend to defeating protection.

The uses that raise no such question are the ones involving material you have the right to copy. Compressing a disc you authored, re-authoring home video, reducing a project you created, or working with unprotected content are all straightforward.

Anybody in doubt about where their own jurisdiction sits should check rather than assume, because the answer varies considerably and the software will not tell you.

Where the format itself has gone

The larger point is that this belongs to a finished era. DVD Shrink was written when the disc was how films arrived and optical drives were universal, and neither is true now.

Machines increasingly ship without a drive at all, which makes both the input and the output of this process difficult to obtain. And the format it works with is standard definition, so even a perfect result is limited by what the source contains.

For converting video you have the right to convert into a modern format for playing on a phone or a television, HandBrake is the current tool and produces files rather than discs, which is how video now travels.

Conclusion

DVD Shrink solved its problem elegantly and taught a generation the lesson that still applies to video, which is that choosing what to keep beats compressing everything equally. The element-by-element view showing where the space actually goes is the part worth remembering, and it applies to any format.

Its era has closed though. Development stopped long ago, the format is standard definition, optical drives are vanishing from machines, and the legal position around commercial discs is why the project ended rather than an incidental detail. Keep it for material you have the right to copy and for understanding where disc space goes, and use current software for video that needs to travel anywhere other than onto a disc.