problem with YOUTUBE plugin

hello
First I would like to thank you for this wonderful program

THE PROBLEM

When i download video from YouTube i get tow files an audio file & the second file is for Video.
with different extension (first file extension is ".m4v" & the secend is ".m4a")


for example

[www.youtube.com]

[www.youtube.com]

[www.youtube.com]

[www.youtube.com]


PLZZZZ fixe this bug As soon as
& thx