Originally Posted by hatchback
Playback on the AX100 is not necessarily free of problems. XAVC S is a highly compressed codec that requires significant computer resources to decode. So the problem you're observing could be a limitation of the AX100 decoder.
Pans require a lot of information to encode because each frame contains new information that did not appear in the previous frame. So in a pan it is easy to exceed the maximum bit rate of the codec (eg 50Mbps), which can severely compromise the image quality.
Speaking to your original point, skilled cinematographers work within the limits of their equipment. They avoid fast pans when they know they won't look good in the delivery medium.
If you want to know exactly what the problem is, upload the native footage so we can all take a look at it and tell you what went wrong.
No computer necessary.
If you plug the AX100 directly in to a TV, such as mine, a 4K LG 55" UB9500, (HDMI 2.0 compliant), it's easy to see the demonstrable difference between 30p and 60p footage.
The AX100 is limited to 30P at 4K resolution.
Panning and zooming at that frame rate is inherently, irrespective of the codec or the camera itself, more "juddery" that 1080 60P.
So, for now, the trade off for 4K resolution, at least at the consumer level....and as far as I know, there are no 4K60P cameras available at a consumer level price point....is less "silky smooth" footage, albeit with much higher detail and resolution.
This is clearly apparent, whether you plug the camera into a monitor directly, or play the files the camera created with a computer hooked up to a monitor.
This "judder" can be mitigated with frame interpolation, which the LG 4K has and does quite well, however, as one of the previous posters noted, this comes at a cost of a "shimmering" effect that frame interpolation causes with dense colors, like grass and foliage.
Nothing can completely make 30P footage look as "liquid smooth" as 60P footage, especially when you pan.
So, the only solution natively, is to shoot at 60P if you want virtually no judder, and wait, like I am, for an affordable 4K60P "prosumer" type of camcorder or camera, which I think we'll see quite soon.
Until then, I can live with the 30P "judder" at 4K, because there are workarounds that can make it quite enjoyable to watch.