Add Timstamp over video

[SourceCodeZone]

Hi I need to add timestamp over the video, right now I am using aiortc for streaming RPI camera over the web, is there any way to add timstamp on the video

Here is the code,

import argparse
import asyncio
import logging
import math

import cv2
import numpy
from av import VideoFrame

from aiortc import (
    RTCIceCandidate,
    RTCPeerConnection,
    RTCSessionDescription,
    VideoStreamTrack,
)
from aiortc.contrib.media import MediaPlayer
from aiortc.contrib.signaling import BYE, add_signaling_arguments, create_signaling
from aiortc import RTCConfiguration, RTCIceServer

async def run(pc, player, signaling,role):
    def add_tracks():
        if player and player.audio:
            pc.addTrack(player.audio)

        if player and player.video:
            pc.addTrack(player.video)
        else:
            pc.addTrack(FlagVideoStreamTrack())

    # connect signaling
    await signaling.connect()

    if role == "offer":
        # send offer
        add_tracks()
        await pc.setLocalDescription(await pc.createOffer())
        await signaling.send(pc.localDescription)

    # consume signaling
    while True:
        obj = await signaling.receive()

        if isinstance(obj, RTCSessionDescription):
            await pc.setRemoteDescription(obj)

            if obj.type == "offer":
                # send answer
                add_tracks()
                await pc.setLocalDescription(await pc.createAnswer())
                await signaling.send(pc.localDescription)
        elif isinstance(obj, RTCIceCandidate):
            await pc.addIceCandidate(obj)
        elif obj is BYE:
            print("Exiting")
            break


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Video stream from the command line")
    parser.add_argument("role", choices=["offer", "answer"])
    parser.add_argument("--play-from", help="Read the media from a file and sent it."),
    parser.add_argument("--record-to", help="Write received media to a file."),
    parser.add_argument("--verbose", "-v", action="count")
    add_signaling_arguments(parser)
    args = parser.parse_args()

    if args.verbose:
        logging.basicConfig(level=logging.DEBUG)

    # create signaling and peer connection
    signaling = create_signaling(args)
    #pc = RTCPeerConnection()
    pc = RTCPeerConnection(configuration=RTCConfiguration(iceServers=[RTCIceServer( urls=['stun:stun.l.google.com:19302'])]))

    # create media source
    options = {"framerate": "30", "video_size": "640x480"}
    player = MediaPlayer("/dev/video0", format="v4l2", options=options)

    # run event loop
    loop = asyncio.get_event_loop()
    try:
        loop.run_until_complete(
            run(
                pc=pc,
                player=player,
                signaling=signaling,
		role=args.role
            )
        )
    except KeyboardInterrupt:
        pass
    finally:
        # cleanup
        loop.run_until_complete(signaling.close())
        loop.run_until_complete(pc.close())

Also I found when start the video on the browser (the receiving peer ) I can see some delay on the live about 3-4 seconds. Is this expected.