> 
>       NSString* argString = [NSString stringWithFormat:@"-i \"%@\" -c copy 
> %@", [url absoluteString], [self.outputFileURL absoluteString]];
>       
>       self.ffMPEGTask = [NSTask launchedTaskWithLaunchPath:execPath 
> arguments:@[argString]];

I believe arguments is an array of arguments, not an array containing a string 
that matches a command line.

> What the argument string should look like is:
> 
> -i <source url> -c copy <dest file>

Then your arguments array should contain five items.

1: -i
2: <source url>
3: -c
4: copy
5: <dest file>



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