So if you close the file (ctrl+w) and reopen it, it doesn't recognise the changes to the file?

This has also the disadvantage of losing the playback position and the playback speed setting. Also, it is even slower than my terminal script of killing LosslessCut completely. Because now I need to close the file and then drag the file again into the LosslessCut window.

Another related thing that might be nice is if the lossless card could open, display and edit files that are being appended to, like mpv. I can record some video in OBS and at the same time play back the file using mpv. And then I would normally pause OBS and then use MPV to preview what I have recorded so far.

I managed to find a way to reload the file from disk on command, but it's a bit difficult to detect when this happens in a cross-platform way. And I'm afraid it's going to cause unexpected problems if we auto-reload. As a first version I can make a custom keyboard shortcut to reload the file. Then it will reload the file with its new duration and preserve playback position.

Nice, thank you. I did not expect this be fixed so fast, or at all actually. I will try in the next release, as the current nightly doesn't open the GUI for me.