[MPlayer-users] execute external commands during media playing
phil_rhodes at rocketmail.com
Thu Apr 10 13:43:35 CEST 2008
> thanks, this seems to be very interesting. Doing such things with
> please show me a simple part of your code, so I can start editing some
Not easily - it wasn't very simple!
The problem is that slave mode is riddled with bugs and appears to be more
or less unmaintained; also, you will almost invariably find yourself wanting
to do things it can't do, such as changing the pan audio filter. I
eventually ended up relaunching mplayer from scratch for every file, so I
could at least have per-file changes to all the usual command line stuff. It
also doesn't help that JScript's stdio reader is blocking, so you have to be
very sure you have something to read when you try to read it, or your
program will become trapped in a lock-o-doom from which there is no escape.
Basically it works like this:
- Build a command line
- Run it with WScript.Shell's Exec method, keeping a reference to the
- Request a time position update
- Request any other info you want
- Read lines until you see the time position update
- Do whatever you need to do based on the information received.
It's slightly flaky in that you could theoretically request a time pos as
"any other info" and you would then stop reading too early, but the simple
solution is "don't do that". There were a lot of exceptions and special
cases for things which didn't quite work as advertised - if you seek to a
given position then read the time position, it won't be the position you
seeked to, for some reason. Tread carefully.
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