Feature to list not downloaded videos because of errors into a text file at the end

[Bmt3s]

Checklist

• I'm reporting a feature request
• I've verified that I'm running youtube-dl version 2019.11.22
• I've searched the bugtracker for similar feature requests including closed ones

Description

WRITE DESCRIPTION HERE

Hi, the Feature is to list not downloaded videos or list errors, and save's them into a text file at the end of progress. thank you, beso

[dstftw]

Redirect stderr to file.

[Bmt3s]

Well I'm not a programmer (I'm a mathematician) I tried: "command > out 2>error" it's do the work :) but it's not showing the progress at the screen while progressing long work, can you kindly give a exact command line. thanks a lot