Some YouTube clips work, other do not

Hi

Some YouTube clips seem to work – such as >

https://www.youtube.com/watch?v=l7L7fME1MA8 and https://www.youtube.com/watch?v=HMmQu4zn1KQ

But others do not – such as https://www.youtube.com/watch?v=eJ4m5bL-tk4 – is there any particular reason or something I need to be looking out for to ensure the clip will work?

Thanks

Richard

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