When downloading an entire channel, the same video should only be downloaded once, so it should be checked if the video ID was already used. On the other hand, if a file randomly happens to have the same name, it should be renamed, but maybe that can't happen anyway without it being the same video etc..
When downloading an entire channel, the same video should only be downloaded once, so it should be checked if the video ID was already used. On the other hand, if a file randomly happens to have the same name, it should be renamed, but maybe that can't happen anyway without it being the same video etc..