Re: NSTask argument list
Re: NSTask argument list
- Subject: Re: NSTask argument list
- From: Sandor Szatmari <email@hidden>
- Date: Sun, 26 Jun 2016 02:49:44 -0400
Graham,
> On Jun 25, 2016, at 23:37, Graham Cox <email@hidden> wrote:
>
> 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]];
I believe you would pass the args to NSTask as follows.
self.ffMPEGTask = [NSTask launchedTaskWithLaunchPath:execPath arguments:@[@"-i", [url absoluteString], @"-c", [self.outputFileURL absoluteString]]];
Type this in mail so it may not be exactly correct, but you get the idea. Each token in your argument list is put in the argument array individually.
Sandor
>
>
> 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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