I came across this clip on youtube from the movie Hellboy 2 and supposedly the language spoken at the beginning is a form of old Gaelic, I know this is very different to modern Irish but I still thought it would be interesting to see what they're saying(not just the English translations which is already given but the actual Irish words) and what words we could make out.

The part concerned is only between 0:00 to 0:40.
I could get a few words such as "rougha","ach bás", "dar leat", also personally I think the first sentence spoken is "is leor é sin!"="that's enough!"(which does not mach the subtitles) but I could be wrong. Would be interesting to see what you can recognize. Also curious to see if this is an accurate portrayal of old Gaelic or just Hollywood messing around

video in question: https://www.youtube.com/watch?v=w4liPmQEPEU

What the king says could be a form of badly pronounced Old Irish (I recognize certain words if I listen a few times). So far I don't recognize much in the speech of the other characters.

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

It's Classical Old Irish (900s), but pronounced oddly and with grammatical errors.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal