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I am trying to play some mp4 files that were captured on my samsung solstice phone. The videos play fine in gnome mplayer, but there's no sound. I am able to play .mov and .avi files with gnome mplayer with no problems.
all smplayer is a qt based front end ( a GUI ) for mplayer
and will not install any new or different media codec 's
I do not use Ubuntu so ...
check apt get to see what codec media packages are installed
but most people just grab the all 2010 tarbal and put them in the codec folder
/usr/lib/codecs or /usr/lib64/codecs
-- or some still use the old folder --
Same issue from a Linux Mint 17.3 Rosa fresh install.
I could hear sound from a basic sound test in the Preferences --> Sound --> Output, and I could hear sound in my chat programs, but just not with any video file, regardless of whether I used VLC or Banshee. I also noticed my Mic wasn't working even though it was enabled and it looked like it was producing sound in my chat program. So I went to Preferences --> Sound --> Input and tested my Mic there. I didn't see the bar go up until I maxed out the volume. Now my mic for my headset works in the chat program, and this caused my sound to work on video files. Isn't that weird? I tried uninstall/reinstall VLC and VLC Pulse packages, and that didn't help.
SOLUTION: So the fix was raising my Mic volume in the Preferences --> Sound --> Input settings. Funny.