Specifying download directory -o doesnt work properly

[limiteddi]

/usr/local/bin/youtube-dl https://www.youtube.com/watch?v=8qOSHvK8JCM
[youtube] 8qOSHvK8JCM: Downloading webpage
[youtube] 8qOSHvK8JCM: Downloading video info webpage
[youtube] 8qOSHvK8JCM: Extracting video information
[download] Destination: Bou Chor _ Drama _ Mosharraf Karim _ Mim _ Bangla Natok 2018 _ Rtv-8qOSHvK8JCM.mp4
[download] 100% of 417.91MiB in 00:06

The above is without specifying download directory. Proper .mp4 files was downloaded.

/usr/local/bin/youtube-dl -o '/home/downloads/%(title)s' https://www.youtube.com/watch?v=8qOSHvK8JCM
[youtube] 8qOSHvK8JCM: Downloading webpage
[youtube] 8qOSHvK8JCM: Downloading video info webpage
[youtube] 8qOSHvK8JCM: Extracting video information
[download] Destination: /home/downloads/Bou Chor _ Drama _ Mosharraf Karim _ Mim _ Bangla Natok 2018 _ Rtv
[download] 100% of 417.91MiB in 00:06

The above downloads file with no extension

Can this be fixed?

[gkoelln]

try:
/usr/local/bin/youtube-dl -o '/home/downloads/%(title)s.%(ext)s' https://www.youtube.com/watch?v=8qOSHvK8JCM