ahh yes, thank you. but i ran into a little problem. consider the code:
open PIPE, "| /usr/bin/mplayer args" or die "failed to open pipe, $!"
while ( <PIPE> ) {
if ($condition) {
close(PIPE);
}
else {
# process line
}
}
it seems that when i close the pipe before EOF, whatever i type in the
terminal that started the perl script is no longer echoed onto the screen.
i.e. the script ends and whatever i type into the console isn't echoed on the
screen (but its there). what gives? =/
thanks for the help,
christopher
On Saturday 04 January 2003 06:03 pm, Ken Irving wrote:
> On Sat, Jan 04, 2003 at 05:45:00PM -0600, christopher j bottaro wrote:
> > hello,
> > i'm writing a little dvd to divx perl script using mencoder and a 3 pass
> > method. i want to allow auto cropdetection and cropping. to find the
> > crop parameters, you gotta run mplayer and watch the output for the crop
> > parameters. well, i suppose in perl i can capture mplayer's output with
> > the backtick operators and search for the crop parameters, but the
> > problem with that is its going to take forever for the movie to finish
> > (or even one chapter to finish). i want to be able to parse the output
> > of mplayer as its running and as soon as i parse the crop parameters, i
> > want to kill the process. how do i do that? i mean how can i do it
> > easily? without starting a seperate thread or something...=P
>
> Instead of backtics, open a pipe to the process and read from it, e.g.,
> something like:
>
> open PIPE, "| /usr/bin/mplayer args" or die "failed to open pipe, $!";
> while ( <PIPE> ) {
> do stuff, bail & close pipe when done
> }
>
> Untested, but I *think* that may do the job.
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