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Could you share one of these videos that cause the problem please? If it's small you can send it at the following: joan at kinovea dot org. If it's more than 5 MB please send it via a file transfer website like swisstransfer or put it on google drive or similar and share the link by email.

For now I would say just set the playback speed to 50% (use up/down arrow keys to land on exact percentages), if it's possible for your use case. And if you are sure the videos were captured at 30 fps you can set that in the time calibration dialog so the timestamps, time intervals, speed measurements, etc. take it into account. Time calibration doesn't touch the internal video frame rate used for playback.

Sometimes the file format container and the video codec disagree maybe it's one of those cases. Unless the video is interlaced in that case you would see artifacts and you would need to do Image > Deinterlace.

Not familiar with continuous x-ray images, is it imaging someone/something in motion or is it the tool that is moving and scanning at different depths/locations? Where is the 30 fps information coming from? Is it 30 or 29.97?

It's not necessarily a simple feature to implement because the magnifier tool is unlike any other tool due to how it behaves and also functionally the magnified area can take up a lot of space in the viewport so it would make it difficult to use (at least until the magnified area can be moved outside the original image area).

Maybe a different approach would be something like the Kinogram mode where the viewport is split in multiple tiles and you can manually pan around inside each tile, and there is a zoom level for all the tiles.

Is it a normal angle object or is it an "angle-to-vertical" or "angle-to-horizontal" object?
There was a bug with the latter that was fixed in 2025.2.

I think the discrepancy is because the ones on the video viewport don't take the smoothing filter into account for performance reason. If you disable all the smoothing in the preferences they should match again. But the smoothing is important for accuracy, to remove digitization noise. The main thing I want to avoid is recalculating the whole series on every frame during tracking and point manipulation, maybe it could update whenever the track exits editing mode.

Ces fonctions ont besoin de plus de mémoire, vous pouvez aller dans Options > Préférences > Lecture > Mémoire et augmenter la mémoire allouée. Et réduire la zone de travail au plus près possible autour de l'action.