DVD9 to DVD5 recommended bitrate and movie length?

[orion44]

Hello...

I use all the default settings in DVD Rebuilder Pro and Cinema Craft encoder SP v2.70,
when encoding from DVD9 to DVD5 (only movie and the menu with no extras).

I would like to know what is the limit in minimum bitrate and maximum movie length where
you can get good quality with all the default settings and the default quantization matrix?

For example, when I encode a DVD9 movie which length is
107 minutes, I get an excellent quality DVD5 movie.

So I would like to know how low can I go with bitrate and how high
does movie length need to be before the picture quality begins to suffer?

What movie length limit is safe for DVD5? 110 min? 120?
Is it possible maybe even 147 min?

Does anyone know?

[Ghitulescu]

Quality is personal. And the bitrate is or should be correlated to the complexity of the scene (action scenes actually do not require so many bits as people usually tend to think, but noise/grain, rain, or similar many small objects moving around do). Computer animations and anime/manga, if clean/ed, can be fit up to 3 hours, depending on the quality awareness.

[varekai]

@orion44

A DVD9 movie is max 7.95GB and a DVD5 holds around 4.32GB, max 4.34GB.
One rough estimation would be to look at the compression level.
Down to 70-75% should probably look OK on a DVD5 using your setup.
Below 70% you might want to consider using a DVD9.
The quality output also depends on how the movie originally was encoded
and the things Ghitulescu mentions will also have an impact.
The above works for me, movie only, no menus, one audio, one or two subtitles.

regards

[orion44]

Thank you.