Why is video stream not working in safari?

Question

Node.js

Hello, I'm transferring the video to the user via stream, everything works in chrome, but it doesn't work in safari.

fs.stat(pathFile, (err, stats) => {
        if (err) {

        // файл не найден
      } else {

        const { range } = req.headers;
        const { size } = stats;
        const start = Number((range || '').replace(/bytes=/, '').split('-')[0]);
        const end = size - 1;
        const chunkSize = (end - start) + 1;

        res.set({
          'Content-Range': `bytes ${start}-${end}/${size}`,
          'Accept-Ranges': 'bytes',
          'Content-Length': chunkSize,
          'Content-Type': 'video/mp4'
        });

        res.status(206);

        const stream = fs.createReadStream(pathFile, { start, end });
        stream.on('open', () => stream.pipe(res));
        stream.on('error', (streamErr) => res.end(streamErr));
      }
    })

What could be the problem?