On Wed, Jan 23, 2013 at 11:06:33PM +0000, Liam Condron-Farnos wrote: > You're not specifying a duration for the aevalsrc, and so it is giving an > infinite length. > > Try using `aevalsrc=0:d=5`. Alternatively, use `-shortest`. Thanks, now I understand is there any disadvantage to just use one -t 5 instead of turn off the sources?