screenshots function not working

[chaoxihailing]

Version information

• fluent-ffmpeg version: ^2.1.2
• ffmpeg version: "@ffmpeg-installer/ffmpeg": "^1.0.15"
• OS: window

Code to reproduce

I hava try example of fluent-ffmpeg with js, it can work; but I want to
it work on typescript. but it not work.

 let proc = ffmpeg("D:\\test\\test.mp4")
            // setup event handlers
            .on("filenames", (filenames) => {
                logger.info("screenshots are ");
            })
            .on("end", () => {
                logger.info("screenshots were saved");
            })
            .on("error", (err) => {
                logger.info("an error happened:" + `${err.message}`);
            })
            // take 2 screenshots at predefined timemarks and size
            .takeScreenshots({ count: 1, size: "320x240", folder: "C:\\test", filename: "thumbnail-at-%f-seconds.png" });

(note: if the problem only happens with some inputs, include a link to such an input file)

Expected results

screenShot work.

Observed results

an error happened:ffmpeg exited with code 1: Failed to set value '97.03149400000001' for option 'ss': Option not found;