I checked until page 18 and didn't see these being mentioned, if they have, feel free to remove my reply.
Both of them are from Greece:
On this one the sounds appear to be extremely far away and you have to pay a lot of attention. Oddly enough, the guy managed to capture some black dots passing by as well. They are visible at 0:13, 0:35 and 1:10. The sounds are easier to hear after 0:50,but still not clear,it does sound close to what's been reported so far though.
Here the sound are crystal clear. I doubt this one being a hoax for varius reasons:
a) The uploader is scared a lot when some other people tell him the theories behind these sounds, both the HAARP one and the alien entities one. The comments are in greek though.
b) The ridicule factor is extremely high here in Greece. Both hoaxes and real footage are laughed upon by pretty much everyone, thus,to put it bluntly, making hoaxes is not a "big hit" around these parts.
The public here is highly unaware,especially the generatios of ages above 40+, since 9/10 of them barely know how to start up a pc and on top of that our media are more focused into the stupidification process. Ever since we got tv channels here,we must have had a total of 2 or 3 cases of UFOs unsettling the public being covered,for like less than a minute each