Mac Forum / Programming / Mac Programming / September 2007

Sorry, this is a stupid question, but I just cannot seem to get it to
work right. I'm trying to have the unix command line tool Mencoder work
from my cocoa application. I am using the TaskWrapper.m from Moriarity.

This was my original attempt, which didn't work :

mencoderTask=[[TaskWrapper alloc] initWithController:self
arguments:[NSArray arrayWithObjects:mencoderPath,@"-vf
scale=320:240",[infile stringValue], @"-o",[outfile stringValue],@"-of
avi",@"-ovc lavc",@"-oac lavc",@"-lavcopts
vcodec=mpeg4:vbitrate=230:acodec=mp3:abitrate=64",@"-alang en",nil]];

The result was a complaint that said:

Option vf scale=320:240: unknown postfix  scale=320:240

So i just tried to make it simple,

changing it to this:

     mencoderTask=[[TaskWrapper alloc] initWithController:self
arguments:[NSArray arrayWithObjects:mencoderPath,@"-vf
scale=320:240",nil]];

Again, I get the same error code.

But if I try this in Terminal,

mencoder -vf scale=320:240

It works, and I just get a complaint that I did not enter a file name.

This one:

mencoderTask=[[TaskWrapper alloc] initWithController:self
arguments:[NSArray arrayWithObjects:mencoderPath,@"-ovc lavc",nil]];

also does not work, and the error result is:

-ovc lavc is not an MEncoder option

But it is accepted in Terminal if I say:

mencoder -ovc lavc

So, something I'm doing wrong, but I can't figure it out. I also tried
backslashes in front of the spaces, but that didn't help.

Thanks for any tips