sync-mpv synchronizes video playback between
mpv clients running
on multiple computers.
Rationale: If multiple computers are playing the same stream at the same time, and are not synchronized, the audio will sound like an echo (or worse).
Use case: Live streaming OBS Studio output to multiple computers across a LAN.
Using Debian Stable (12/Bookworm).
Install thine dependencies:
sudo apt update sudo apt install git mpv python3-pip python3-virtualenv
git clone https://spacecruft.org/deepcrayon/sync-mpv cd sync-mpv/
Set up Python to taste, such as:
virtualenv env source env/bin/activate pip install --upgrade pip setuptools wheel
Install Python dependencies:
pip install -r requirements.txt
Run the server on a machine all the clients can reach. This can be the same server that hosts the video stream, or a completely different machine for any arbitrary URL.
$ ./sync_mpv_server.py -h usage: sync_mpv_server.py [-h] [-i IP] [-p PORT] [-u URL] mpv synchronization server options: -h, --help show this help message and exit -i IP, --ip IP Server IP address (default 0.0.0.0) -p PORT, --port PORT Server network port (default 51984) -u URL, --url URL URL to play
On first run, it will prompt you for password, which will be saved for
The server password is stored in plaintext here:
The client runs on the machine that will run
mpv, which it spawns.
$ ./sync_mpv_client.py -h usage: sync_mpv_client.py [-h] [-i IP] [-p PORT] mpv synchronization client options: -h, --help show this help message and exit -i IP, --ip IP Server IP address -p PORT, --port PORT Server Port
It will prompt you for a IP address. Enter the IP address of the
server. By default it will connect on
TCP/51984, which will need
to be open on the firewall that is surely running.
It will prompt for a username, which can be whatever.
It will prompt for a password, which is the main one set in the server.
This will all be stored in the configuration file
The password is stored in plaintext.
There are two main scripts in the application. One is the server, the other is the client. The server runs on one machine. The client runs on as many machines as you want, including the server. The server listens on an IP address and port for TCP connections. The server doesn't do any video processing, the load is near zero. The server just coordinates connections and synchronization. When a new client connects, the other clients may pause for a moment, which sucks. The server has the URL to play. The client connects, gets the URL, starts playback and synchronization. There are usernames and a single shared password. The password is supposedly secure across the network with some Python AES library, but I doubt it. This thing actually appears to work, wow.
To "develop", install the requirements:
pip install -r requirements-dev.txt
black on the Python files for nice formatting:
This present repo is an updated fork of this repo:
README-upstream.md for upstream's README.
- Ideally this would be in
mpv, but they haven't implement it yet, afaict: https://github.com/mpv-player/mpv/issues/1272
mplayerhas this ability with options like
-udp-master, but it doesn't support SRT and recent codecs.
There are many different similar projects, namely have two+ machines play the same video at the same time. I tried many of them, but they didn't work for my use case. For instance:
- The application was for file playback, not "realtime" streaming.
- Used for synchronization "far" across the Internet, so acceptable delays are in the 1-5 second range. That is far too much latency, it is ideally 20ms or below.
- Not maintained.
- Too much overhead (e.g. QT).
- Audio only. Something like JACK doing streaming video would be ideal.
Unofficial project, not related to mdnghtman or mpv.
Upstream sources under their respective copyrights.
Copyright © 2023, Jeff Moe.