griget.py

import gridfs
import pymongo


conn = pymongo.MongoClient("mongodb://localhost:27017")
db = conn.test
videos_meta = db.videos_meta

def main():
    grid_id = videos_meta.find_one({"filename": "video.mp4"})["grid_id"]
    print("Filename grid id: %s" % grid_id)
    grid = gridfs.GridFS(db, "videos")
    print("File found: %s " % grid.exists(grid_id))
    fd = grid.get(grid_id)
    with open("video1.mp4", "wb") as fdout:
        fdout.write(fd.read())
    print("Done.")

if __name__ == "__main__":
    main()