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By flickering do you mean that the frames are rendered out of order? there are black frames? something else?
If you re-open the exported video in Kinovea does it also do this or only the other media player?
Does it do it in VLC media player? What is the other player?

You should be able to change the color and re-export.

You save the analysis itself to a KVA file which is text based and has the style information. If you reload this file onto the original video (File > Load annotations…) you can continue the analysis, change the existing positions, color, name of the trajectories or any other object. Normally the KVA file is saved with the same name as the original video, only the extension change, in that case it will be loaded automatically when you open the video.

The images and videos exported have the drawings baked in so they can't be modified afterwards. But if you still have the annotation file (.kva) and the original video, you should be able to make some changes and redo the export.

Hmm, I don't think it's in the scope of the project to tell you where to place the markers, it really depends on what you want to study. This should normally be based on the specific domain's literature.

Placing markers in one place or another doesn't really change how they are tracked inside the software, the only caveat is to be aware that cloth or even the skin can "swim" a bit above the actual point you want to track, and that occlusions are not well handled so you may have to manually correct the track position during the frames they are occluded.

It sounds like a bug but I haven't experienced it so it might happen in a context I haven't tested. This behavior of decreasing the playback speed automatically happens when the player starts the playback loop but can't keep up the pace, typically because it doesn't have enough resources. First it skips frames, then skips multiple frames at once, if skipping frames is not enough it starts lowering the frame rate.

Normally it settles down to whatever it can manage. Since you say that manually changing the speed works, it seems there is something that makes the system busy specifically when the file is opened for some reason.

What is your window/screen setup? Try with one window for the capture and a separate window for replay, this should better spread the load over different CPU cores. If you have two cameras and a dual replay, make sure the files don't go to the same folder.

Do you have a default annotation file that is being loaded in the player?

Another idea, are the files saved to a folder that is synchronized to cloud storage, like OneDrive or Google Drive?

Thanks, I see what's going on. I made a fix but I was actually considering removing these settings from that window and only leave the style options like for other drawings. The annotation panel should be the main way to interact with it and it has all the options now (match and update thresholds).

Yes unfortunately this is always an issue with new releases. I believe the only work around during the initial period is to click "More Info" and then "Run anyway".

It is a reputation based system handled by Microsoft, once enough people do this the warning goes away. They have a business model where the software publishers buy a code-signing certificate to make it go away faster. I will review the options again as I haven't looked into it in a while.