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I made a similar query in the Bluray authoring forum, and then realized I should also raise that question here.
What I was wondering is if it's alright to use "intermediate" kbps rates for AC3 settings, like 512 or 576kbps. Is it?
Then I can adjust the size of my MKV files a lot better.
Of course "uncommon" bitrates are OK. "448kbps" is just the maximum value allowed by the the DVD-Video specs, and 640kbps is the maximum bitrate allowed by the format itself. They are not "magic numbers", and you can even encode 6 channels to AC3 at 192kbps (the final result will suck, evidently).
Everything will depend of the film. If it's an old movie, then using 192kbps should do fine probably.
It happens than on the mkv files I am working with, there are not many variables I can handle to make them fit into SL or DL DVDs. The AC3 track can be one of them.
At the same time I would like to use the highest kbps I can put in.
With Avisynth I have several intermediate kbps that I didn't know if I could use. It's nice to know I can.
Thanks!