I also saw a lot of vibration when hard mounting to the aircraft. I resolved this for 720p video a few ways:
- Mount to the aircraft frame or something attached directly to it. The closer you are to the frame, the less vibration there is.
- Use the shortest mount you can. Again, the closer you are to the mounting point, the less vibration there is.
- If the camera's case comes very close to the aircraft in any place, use a wad of double-sided tape between it and the aircraft. This not only firms up the mount a tiny bit, but it seems to reduce vibration.
I use an Ultra-clamp with the GoPro tripod mount adapter and clamp to a point on my helicopter's frame.
If you're using the GoPro-provided mounts, be sure to use that white rubbery thing that came with them to reduce vibration in the clip.
Here are two recent examples with my current setup. The first is long with most flight at higher altitude:
This one is much shorter with mostly low-level flight:
I am still unable to capture 1080p video without excessive vibration, despite my use of a Class 10 SD card (increased writing speed) and what I consider a rock-solid mount.
The drawbacks to my current setup are primarily the fact that I can't tilt the camera down. I'm working on that.