I don't thing that it is a bug IMHO. Part of the problem is that you are panning across a background at the same time as tracking the balloon. Panning can always cause problems with simple stabilising effects. Different settings might improve the situation or, alternatively, using a more sophisticated plugin such as proDad Mercalli.

All:

I wanted to demonstrate the annoying jitter I got after running a clip through the new video stabilizer. The original content was filmed with a sony ax53 that does some built in optical stabilization and was recorded at 4k 30fps. I used Accurate, Similarity, left the smoothing to 2.5 seconds. I disabled zoom which makes it easier to see the jitter on the edges, the original video is the bottom half of the video and the top half is the stabilized version. I'd like to report this as a bug - I want to use this feature but can't until this is resolved!

 

Have you tried build 307 (Update 2)?

I have tested build 307 and while better it still has the judder in the 2nd half of the video. Curiously, the video starts out looking very good but the 2nd half the judder returns.

I started a new project for this, used the default smoothing value of 6.2 - is this a change from v1?

I set zoom to 0 to help see the stabilizer behavior.

I would agree with the above comments - this is a lot to ask of any stabilization software. It's a long clip with a lot of movement. Amazing that it smooths so much of it so well. Would be interesting to see of Mercalli does any better. Maybe download a trial and see.

As an aside, very long scenes are a little hard on the audience. You could easily divide into shorter clips (most of my edits are 3-5 seconds long) with jump cuts and get a more interesting & dynamic video.

In my build 307 the default Smoothing is still 2.5. BTW have you tried Translation for the Motion Compensation?

After testing the Video Stabilization FX in all the released builds, so far, Mercalli 4 Plugin does a much better job for my stuff, but as ryclark pointed out, panning adds for difficulty to the stabilization process. If you haven't tried it, ProDad offers a trial version of Mercalli 4 Plugin for Vegas. Try it straight out of the box with defaults, I bet you will like it better and it has additional controls, although you may not like it enough to justify the price. If you do like it, get on their mailing list as they do from time to time run specials, especially Black Friday and Cyber Monday.

In my build 307 the default Smoothing is still 2.5. BTW have you tried Translation for the Motion Compensation?

The result looks quite good to me and 'Similarity' is the correct model (because of the rotation and zoom) for you. Could you send us your sample? We improve continously... 😉