Memory Leak Issue in PyTube Downloader

I have encountered a memory leak issue in the PyTube Downloader application. When videos are added and then removed, the memory is not fully cleaned up. I wrote a custom destructor to delete all member variables, but it does not seem to resolve the issue completely.

Steps to Reproduce

• Add videos to the downloader.
• Remove videos from the downloader.
• Observe memory usage not decreasing as expected.

Expected Behavior

Memory should be cleaned up completely after removing videos.

Actual Behavior

Memory usage does not decrease fully, indicating a memory leak.