Method setup_decode_input

ffmpeg/src/args.rs:173–181

(&mut self)

    }

    pub fn setup_decode_input(&mut self) {
        let splits = self.first_input.split("y4m").collect::<Vec<&str>>();
        // we'll probably want to change the file extension at some point but, .mp4 is fine for now
        let file_prefix = splits.get(0).unwrap();
        let mut output = String::from("");
        output.push_str(file_prefix);
        output.push_str("mp4");
        self.first_input = output;
    }

    pub fn set_no_output_for_error(&mut self) {
        self.output_args = NO_OUTPUT.to_string();