// Video is the object containing all the information needed for
// conversion to ascii.
struct Video {
pub:
    // path may be URL or path on local file system.
    path         string
    tmp_dir      string
    frame_count  int
    frame_format FrameFormat
pub mut:
    // TODO: once V fixes bug #19281 replace the type here
    // with `thread !`. And the return type on the corresponding
    // function that is spawned.
    extract_frames_thread thread string
    frames                [][]u8
    framerate             f64 = 24.0
}

enum FrameFormat {
    bmp
    jpg
}

fn (video Video) extract_frames() string {
    // try to extract frames os.execute()
    // if os.execute() returns with an exit
    // code other than 0, return an error.
    if true {
        return 'Failed to extract frames: os.execute() cmd output'
    }
    // do something else
    return '1234'
}

fn main() {
    mut video := Video{
        path:    '/path/to/some/mp4'
        tmp_dir: '/tmp'
    }
    video.extract_frames_thread = spawn video.extract_frames()
    println(video.extract_frames_thread.wait())
    println(video)
    flush_stdout()
}