How to read a video with gridfs-stream?

Is necessary to use the range option, it allows us to select another position in the video and play it. In other words, making a request to the server so that the server responds with the data we need.

Here is the complete code, I hope they serve someone.

I found the example here.

exports.readById = function(req, res) {    var id = req.modelName._id;    gfs.findOne({        _id: id    }, function(err, file) {        if (err) {            return res.status(400).send({                err: errorHandler.getErrorMessage(err)            });        }        if (!file) {            return res.status(404).send({                err: 'No se encontró el registro especificado.'            });        }        if (req.headers['range']) {            var parts = req.headers['range'].replace(/bytes=/, "").split("-");            var partialstart = parts[0];            var partialend = parts[1];            var start = parseInt(partialstart, 10);            var end = partialend ? parseInt(partialend, 10) : file.length - 1;            var chunksize = (end - start) + 1;            res.writeHead(206, {                'Accept-Ranges': 'bytes',                'Content-Length': chunksize,                'Content-Range': 'bytes ' + start + '-' + end + '/' + file.length,                'Content-Type': file.contentType            });            gfs.createReadStream({                _id: file._id,                range: {                    startPos: start,                    endPos: end                }            }).pipe(res);        } else {            res.header('Content-Length', file.length);            res.header('Content-Type', file.contentType);            gfs.createReadStream({                _id: file._id            }).pipe(res);        }    });};