NSTask argument list
NSTask argument list
- Subject: NSTask argument list
- From: Graham Cox <email@hidden>
- Date: Sun, 26 Jun 2016 13:37:02 +1000
HI all,
I am using NSTask to wrap ffmpeg, the video conversion utility.
I am able to invoke ffmpeg alright, but it’s unclear how the argument list should be passed through NSTask. I tried making my various arguments into one big string, but ffmeg doesn’t parse it, instead writing an error.
Here’s my code:
NSString* execPath = [[[self class] ffMPEGURL] path];
NSString* argString = [NSString stringWithFormat:@"-i \"%@\" -c copy %@", [url absoluteString], [self.outputFileURL absoluteString]];
self.ffMPEGTask = [NSTask launchedTaskWithLaunchPath:execPath arguments:@[argString]];
What the argument string should look like is:
-i <source url> -c copy <dest file>
ffmpeg responds:
Unrecognized option 'i "http://<the stream url>" -c copy file:///<destination file>'.
Error splitting the argument list: Option not found
Obviously I need to pass the arguments differently, but it’s not clear what I need to do.
—Graham
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