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I am trying to play various formats on SMPlayer but none of them have sound, mp4, mp3, flash videos after download from youtube, wav.

These are all playing with GNOME MPlayer, but I require the SMTube tool to watch youtube videos directly on SMPlayer. Sound is enabled. Here it is a screenshot.

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I had the same problem a while back. 2 things to consider: check in sound settings if the audio source is selected and install pavucontrol. For me THE tool for checking audio related problems. – Rinzwind Dec 4 '12 at 21:26
up vote 1 down vote accepted

As Rinzwind suggested, I went to the preferences (Ctrl+P), audio tab and changed the output controller from 'pulse' to 'alsa'. Now the sound is back, problem solved.

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