With 3.07 .dash.m4v left behind

[Ralph Corderoy]

Hi Richard,

> As well as separating the two files in the unlink statement at 5988 you 
> could try inserting a delay between them as Ralph suggested.

No, I didn't.  :-)  I did suggest adding a delay *before* attempting to
unlink to allow all the bits of ffmpeg hanging around after the main
thread has exited to themselves exit.  If that's done, and the problem
doesn't reoccur after enough attempts compared to its previous
frequency, then that would suggest I'm right about the cause.

Best of all would be to collect `$!' when one of the unlinks returns
false as I suspect that will be a specific `file is open' error.

-- 
Cheers, Ralph.
https://plus.google.com/+RalphCorderoy