--write-thumbnail flag option ignores -o, --output flag option

[niroyb]

When both --write-thumbnail and -o are use in the same command, the tumbnail will have an empty filename with the extension. The output folder is also ignored.
ex: youtube-dl --write-thumbnail --skip-download -o test http://www.youtube.com/watch?v=m6uto4wQY_g

[jaimeMF]

The problem is that you didn't give an extension in the command line, -o test.mp4 or -o test.%(ext)s will work.
What do you mean by "The output folder is also ignored."?

[phihag]

Thanks for the report. This issue has been fixed in youtube-dl 2013.12.11.1 and newer (your command line will generate a file test.jpg). Type youtube-dl -U to update.

[niroyb]

Thanks for the fix! Works great.