are there hash sites that will check a video file for errors?

[snafoo]

maybe this is off-topic, but are there websites that check a video file for hash errors?

[jagabo]

For a hash to be useful you have to have a reference file. The only thing the hashes can tell is if the two files are identical. And if they're not identical you don't know which one is the "good" one. Or both may be bad.