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Hi, unfortunately I think you are hitting the bug where file names with Korean characters fail to load. There is no fix at this moment, a work around is to rename the files to use Latin characters, sorry.

Yes it's a good observation. There is no "absolute" time reference so whether you assume the events in the images are happening at the beginning, middle or end of the frame interval doesn't really matter as long as you always assume the same alignment, addition/subtraction between time stamps will work the same. The timestamps are coming from the video file and ultimately from the camera where they could mean any alignment. Inside the playback screen as soon as the time interval starts it tries to display the corresponding frame.

To further complicate the issue many cameras have a rolling shutter, different *lines* are captured at different times within the frame interval.

That's very odd and the first time I hear about something like this, I'm not sure what could cause the issue.

If you go to the log folder there might be a number of crash files with names starting with "Unhandled Crash", could you please send me the log.txt and log.txt.1 and any of those Unhandled crash files at joan at kinovea dot org please?

Are you working with two instances of Kinovea or dual screen inside one instance?
Do you have the same issue when working with just one video? Is it specific to when you work with two videos?

Normally when it crashes the next time you open it should propose to load the last session, including any unsaved changes, if you don't see that there might be a second problem.

Hi, these instructions are for an older version, there is an additional "arming" mechanism now that's preventing unwanted recordings, and it's disarmed by default (this may change in the future but for now it's like this). In the toolbar at the bottom of the screen there is a speaker icon that you need to toggle. Once you toggle it to "armed" it should work. You need to do this once at the beginning of the session.

I didn't quite get the relation between triple playback and HD framing.

It should be possible to add spacing between the two videos, or maybe a margin at the bottom, I'll write it down for later.

It is unlikely to happen in the near future. Other things you can do is launch two instances of Kinovea, but you won't have synchronization, or maybe synchronize two videos first, export that and then load the combo with the third.

May I ask if this is for synchronizing 3 different persons or 3 different views of the same person, or something else?