enhancement：skip downloaded video when restart the script

[Joshua-auhsoj]

When the download is interrupted and the program is restarted, it seems to re-download all the videos, and it is cumbersome to select from the list. Please add a feature to automatically skip already downloaded videos. thanks 🙏

[EchterAlsFake]

Done with release 2.9

it works now by checking if the video already exists and if it exists it checks the length of the video. If the length is + - 5 seconds of th original it's considered to be valid. If more it's re-downloaded.

Thanks for reporting :)

[Joshua-auhsoj]

Done with release 2.9

it works now by checking if the video already exists and if it exists it checks the length of the video. If the length is + - 5 seconds of th original it's considered to be valid. If more it's re-downloaded.

Thanks for reporting :)

thank you very much ！🙏