Control bar descriptions:
: You can click these buttons to skip backward or
forward 3% each time.
: You can click these buttons to select the play speed
: Click this button to pause.
: Click this button to be mute, click it again to recover
the sound.
: Click this button to start copy the segment, click it
again to stop.
: Click this button to hide the control bar, right click
your mouse and select display to display the control
bar.
: Click this button will trigger a rectangle area on the
key to zoom in that place. Click left key again to
return to the playback interface.
screen ,draw the rectangle with left key of your mouse
to the area you want to zoom in then double click left
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