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Regarding the above, not sure what happen since previously I could play any files I download from youtube, be it avi or mp4.

Now I cannot play any mp4 file downloaded from youtube but no issue to play any other file format (avi, mov, flv using VLC. Some other mp4 files that was downloaded from different source other than youtube are able to play.

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could you run vlc -vv *mp4 file of your choice* in a terminal and look for errors? this might help too: askubuntu.com/questions/166311/… –  rearlight Jul 11 '13 at 14:20
    
No error message displayed. It just stop after i click on play button. –  Lee Jul 11 '13 at 14:53
    
same for me. It was working previously but all of sudden stopped now. Guess Google has changed some codecs, not sure –  Anmol Saraf Aug 13 '13 at 0:56
    
archive.org/download/HardDriveSpinning/HardDriveWebm.mp4 is a Google-free MP4 file with audio you can use for testing. –  K7AAY Mar 21 at 4:28

3 Answers 3

In the extensions of Google Chrome install "YouTube video downloader" or FlashGot for Firefox or look at the answers for this question: How do I download a YouTube video?

You will get options to download in different formats like .webm (recommended because it uses free audio and video codecs), .mp4 or .flv. The downloaded videos can be played in VLC for example.

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Version 2.1.2 supports video, but not audio for YouTube Downloaded Videos .

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vls does not support for mp4a and youtube download file... dnt wry frnzz. download a latest upgrade 2.1.2 of vlc which support mp4a file and u can open yr you tube file. if that is not work then download vlc mp4a coded from net and install them manually..

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