Why exact 30secs or 60 secs versions?

[Mark_Petrie]

TV and radio advertisements – the same reason that :15 versions are sometimes requested

[woodsdenis]

Also most TV stations require a certain amount silence at the start and end of a commercial, therefore a 30 sec spot would only have 29 sec approx sec of actual sound or music. This prevents commercials butting up against each other audio wise on transmission. I cant remember the exact EBU duration I think it is 10 frames @ 25 fps at either end.

[audaxl]

OK now I understand

Thanks

[Author]

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