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NSTask argument list
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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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