Mixed frame rate video clips on the same Blu-ray disc

Before I go into the detail, this actually isn’t an issue for me, but more of a finding the answer to a different question, so please bear with me.
To explain: I live in the UK, and I’m forever challenged by the different native video frame rates imposed by the PAL and NTSC standards. Every consumer camcorder I’ve ever seen only produces HD output (1920 x 1080) at either 50 fields/second interlaced, or 25 (sometimes 50) frames/second progressive. Some action cameras (Go Pro) I possess allow me to record at 30fps progressive, in full HD, which for fast movement is simply better. This in itself is not really a problem, but I use other software (all USA sourced) for video production whose best results are only visible when the finished HD output is 1080/60i.
Having mixed frame rate video is a real problem for the DVD standard, but no so much for Blu-ray. Indeed Adobe Encore neatly gets around this problem, so I can actually author a Blu-ray disc which contains full HD video clips that may be either 50i or 60i. Both types of video exist on the same disc, and when played back through a Blu-ray player/TV combination, the resultant video clips are shown correctly. Player and TV switch seamlessly to the correct setting to handle the video content. So, I have a solution to my problem, but at the same time, a question I can’t find an answer to, which is this:
Does the Blu-ray specification allow video clips of different native frame rates (i.e. 25fps and 30fps) assuming the resolution is the same, to co-exist on the same Blu-ray disc as a supported feature?
It works, but I can’t find one shred of information that says what I’m doing is supported.
Comments are most welcome.
Regards,
Steve

Stan Jones wrote:
Encore requires you to specify the project type as PAL or NTSC (whether you start it as Bluray or DVD), and does not allow you to change it later. Also, if you try to create a transcode type for PAL in an NTSC project you cannot get to the 25 fps setting (and therefore, I think, cannot do it).
But if you import a Bluray legal 25i file to an NTSC project, it is happily added.
DVD player conventional wisdom is that PAL players handle NTSC disks, but NTSC players do not generally handle PAL disks. I never quite understood why the TVs were not more of the issue. Do Bluray players even differentiate between PAL and NTSC?
Even if the player will handle PAL, the TV may well not do so - so there is more going on.
NTSC uses (generally) 60Hz systems whereas PAL is 50Hz hence the problem.
Do not try to mix standards as it will not be allowed - however, multiple frame rates are allowed as long as they are within spec for that TV standard.
They are best avoided though - otherwise you run a very real chance of serious asset truncation as the TV display switches between different resolutions & frame rates.

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