Added options to specify video previe image snapshot time. Also updated run_command with option to get stderr output as this is what ffmpeg outputs to. 


git-svn-id: http://svn.resourcespace.org/svn/resourcespace@4513 c08608d7-6e46-0410-86ca-f2a6f1370df5
Initial commit
Merge branch 'master' of github.com:rzamana/resourcespace