Quoting DJ Doena:

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regarding the beta feature "Play All": Is it reasonable to assume that if Disc 1 has a "Play All" feature that every disc has a play all feature.

Well, I was wondering what is exactly this feature. I have never seen it on any movie, even most recent ones. What does it do exactly ?

Quoting DJ Doena:

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It's not for movies, it's for TV series.

OK, thank you.
I understand why I never saw it. I think I'll use the field for another feature using translation file.

Quoting Addicted2DVD:

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Not only TV series... see this on collections of shorts as well. And while rare there has been times I seen it when multiple films were on a single side of a disc.

You are perhaps right, but I never saw it. In another hand, I have many movies with different versions (theater, extended, Director's cut...) on the same disc, and I'll use the field for that, which is much more useful, as soon as the master translation file is available.

In my experience at least....whenever there was a play all on one disc in the set... it was on all of them.

While it is hard to say anything for sure...until rules are written for the field... I would say you do like you would any feature... on TV series if it is on even one disc it would also go in the parent.  For example look at trailers... they are usually only on one disc but it gets put on the disc profile as well as the parent profile. Same for when there is only 1 featurette... 1 commentary... what have you. The parent profile would be anything that is available anywhere in the set.

Oh! I thought this means those "Season Play"-Things that are on some TV shows like Lost. Where you can play an entire season, and the java-thingie on the discs remembers where you were and tells you which disc to put in etc.

That would be a feature i could understand if somebody wants to track those. A "Play All" Button that just starts all episodes on a disc is hardly a feature to me and even less a feature worth tracking? Or how many times did you stand in front of a collection thinking "oh i want to watch a TV show where all epsiodes on a disc can run with just one click! if only there was a way of tracking that!"

Quoting surfeur51:

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In another hand, I have many movies with different versions (theater, extended, Director's cut...) on the same disc, and I'll use the field for that, which is much more useful, as soon as the master translation file is available.

Or you can use Enhanced Features instead.

I know that when I was reviewing DVDs the absence of a Play All button for TV series would seriously annoy me. Noting its presence in profiles is a good thing as far as I'm concerned.

yes... that is correct