Bonjour Joan,
I've recently experienced some issues with exporting "side by side" videos. I usual analyse screen recorded video after sporting events. Regardless of the annotations used I've not previously experienced issues.
However currently my videos export with shorter lengths than when viewed in Kinovea, or play upside down in certain players (VLC). Some also export in slo-mo even though I have chosen 100% speed for export.
The only issue I can spot is that I am mixing source file types (MKV, MP4 and 25 vs. 60 fps). But previously this has not been an issue.
Let me know if I am missing something
Merci