Files are not closed correctly

[ComplexP2]

Description:
When I close a file (after doing some cuts and exporting the merged result), I cannot move the source file to another folder or rename it, because Windows Explorer tells me that "the file is still opened in LosslessCut".
I'm using the current version 3.39.0

I can reproduce the issue as follows:

1. File -> Open: select some mp4 file (the source file)
2. Select a section of the video and export it (settings see screenshot below)
3. File -> Close
4. Do not close LoslessCut
5. In Windows Explorer: Try to rename or move the source file -> Error

Export settings:

My system:

• OS: Windows 10

Further notes:
Using the tool LockHunter, I can actually see that LosslessCut is really still locking the file. Also, I can use LockHunter to unlock the file (see screenshot) and after that, I can rename/move the file as expected:

[mifi]

Thank for your testing. This is a dup of #272
Is the file you are using «not natively supported» or does it play back without any such message? I think it may be related to https://bugs.chromium.org/p/chromium/issues/detail?id=969049