YouTube now supports 1080p60 and 720p60!

[Interceptor121]

AVCHD 1.0 spec only allows 24/25p not 30p as progressive. AVCHD progressive brings 50/60p. Difference in bitrate 28 vs 24 including audio take audio out 26 vs 22. Consumer cameras don't use B frames so all the additional frames are only interpolations. As your eye interpolates better this is a total waste of time. XAVC 50 MBps for 50/60p starts to be a bit better compared to AVCHD anyway as the GOP formats don't change the lower frame rates always performs better on consumer cameras
The camera you show here will perform better in fx mode 24 Mbps than in ps mode
The reason why the footage looks smoother for NTSC users has nothing to do with double frame rate but is because 24p suffers from 3:2 pull down and 30p is not supported in AVCHD
Unfortunately

 

[A.Y.]

danvolker, Your method of up-sampling to 422/444 for editing is the prefer way to edit. In the video, the filmmaker mentioned the AVCHD footage was converted to ProRes 422 for editing.

[video=youtube;yIGo57f5aVA]https://www.youtube.com/watch?v=yIGo57f5aVA[/video]

Here's a NEX-FS700 1080 240p AVCHD underwater video shot by Peter Schneider.

FS700 was also used to capture underwater footage for TV show Splash and the camera now supports 4K 120p RAW.

 

[Interceptor121]

Ronscuba here used it for galapagos and so has nick hope in the past. Gates made a housing for it
Now with the GH4 this is all a bit dead as new camera shoot all intra or prores directly.
Any editing program converts into a non temporal compressed format so that you can slow down footage or stabilise it but the best results are when your footage is not so compressed when captured.
AVCHD with 24 or 28 Mbps simply hasn't got enough quality to be worth playing around with it too much and I don't bother converting anymore as any processing looses information doesn't improve matters. Look at the color of my clips and you can see that actually it looks better than any of those heavily manipulated edits sometimes even better than the camera with extensive grading depending on how that is done