NODEJS - gridfs-stream - video

stream-function.coffee

StreamGridFile = (req, res,size,id,contentType) ->
  if req.headers['range']
    parts = req.headers['range'].replace(/bytes=/, '').split('-')
    partialStart = parts[0]
    partialEnd = parts[1]
    start = parseInt(partialStart, 10)
    end = if partialEnd then parseInt(partialEnd, 10) else size - 1
    chunkSize = end - start + 1
    res.writeHead 206,
      'Content-Range': 'bytes ' + start + '-' + end + '/' + size
      'Accept-Ranges': 'bytes'
      'Content-Length': chunkSize
      'Content-Type': contentType
    global.gfs.createReadStream(
      _id: id
      range:
        startPos:start
        endPos:end
    ).pipe res
  else
    res.header 'Content-Type', contentType
    res.header 'Content-Length', size
    readStream = global.gfs.createReadStream(_id: id)
    readStream.pipe res

based on: https://gist.github.com/psi-4ward/7099001