Unable to find a suitable output format for

[ricardroberg]

I changed line 24 from -3 to -4 and worked.

new_filename = default_filename[0:-4] + "mp3"

[goors]

Same here. This fixed it.

[dilettante8]

The code below removes everything after the rightmost dot (.) and appends ".mp3" behind the file name. This works for even titles with dot in the name.

new_filename = re.sub(r".[^.]+$", "", default_filename) + ".mp3"

e.g.

default_filename = "Seven Starts ft. Cyber.3gpp"

new_filename = "Seven Starts ft. Cyber.mp3"

default_filename = "Counting Stars.mp4"

new_filename = "Counting Stars.mp3"