Originally Posted by Okie
type in both commands in the same line separated by either && or |
represents “AND” and will run the second instance after
the first instance (only if the first instance exited successfully).
represents a pipe, and will run both simultaneously (but the input of the second will be borked/uncontrollable because it will be connected to the output of the first).
is your most likely best option. It will put the first instance in “the background”, allowing the second instance to run. Of course, mplayer is expecting a terminal for stdin, so you might have to tell it otherwise (i.e., use the “-slave” option).