This is a small toolbox to simplify re-streaming a Google Nest Cam to YouTube.
- Set up a Google Cloud Platform project and Device Access project
- Set up
token-keeper.pyservice unit - Set up
stream-keeper.pyservice unit - Set up re-streaming service unit
- Set up
subtitles-sender.pyservice unit (TODO)
This is a simple service to keep a valid access token in a file. Basically, it obtains a new token as soon as old one expires.
To use it, you need a client ID, client secret, and a refresh token. See the Quick Start Guide on Google Developers to obtain them.
Usage: token-keeper.py [OPTIONS]
Google Device Access token refresh service.
Implements https://developers.google.com/identity/protocols/oauth2/web-server#offline
Options:
--client-id TEXT [env var: TOKEN_KEEPER_CLIENT_ID;required]
--client-secret TEXT [env var: TOKEN_KEEPER_CLIENT_SECRET;required]
--refresh-token TEXT [env var: TOKEN_KEEPER_REFRESH_TOKEN;required]
--access-token-file FILE [env var: TOKEN_KEEPER_ACCESS_TOKEN_FILE;required]
--help Show this message and exit.
systemd service
[Unit]
Description = Token Keeper
BindsTo = network-online.target
After = network.target network-online.target
[Install]
WantedBy = multi-user.target
[Service]
WorkingDirectory = /home/pi
StandardOutput = journal
StandardError = journal
Restart = always
User = pi
ExecStart = /home/pi/nest-restream/venv/bin/python /home/pi/nest-restream/token-keeper.py
Environment = "TOKEN_KEEPER_CLIENT_ID=<gcp-client-id>"
Environment = "TOKEN_KEEPER_CLIENT_SECRET=<gcp-client-secret>"
Environment = "TOKEN_KEEPER_REFRESH_TOKEN=<gcp-refresh-token>"
Environment = "TOKEN_KEEPER_ACCESS_TOKEN_FILE=/home/pi/access-token.txt"This is a service to generate an RSTP stream and to extend it periodically before it expires. It keeps a valid stream URL in a file that can be specified as EnvironmentFile in systemd.
Requires a valid access token from token-keeper.py.
Usage: stream-keeper.py [OPTIONS]
Keeps a valid RTSP stream URL.
Options:
--access-token-file FILE [env var: STREAM_KEEPER_ACCESS_TOKEN_FILE;required]
--device-id TEXT [env var: STREAM_KEEPER_DEVICE_ID;required]
--project-id TEXT Device Access project ID. [env var: STREAM_KEEPER_PROJECT_ID;required]
--stream-url-file FILE [env var: STREAM_KEEPER_STREAM_URL_FILE;required]
--help Show this message and exit.
systemd service
[Unit]
Description = Stream Keeper
BindsTo = network-online.target
After = network.target network-online.target
[Install]
WantedBy = multi-user.target
[Service]
WorkingDirectory = /home/pi
StandardOutput = journal
StandardError = journal
Restart = always
User = pi
ExecStart = /home/pi/nest-restream/venv/bin/python /home/pi/nest-restream/stream-keeper.py
Environment = "STREAM_KEEPER_ACCESS_TOKEN_FILE=/home/pi/access-token.txt"
Environment = "STREAM_KEEPER_DEVICE_ID=<device-id>"
Environment = "STREAM_KEEPER_PROJECT_ID=<device-access-project-id>"
Environment = "STREAM_KEEPER_STREAM_URL_FILE=/home/pi/stream-url.txt"Integrating with ffmpeg
The stream URL changes every few minutes, thus I set RestartSec = 0 to make restarts as quick as possible. This isn't perfect, of course, and I'd be happy to hear a better solution.
${STREAM_KEEPER_STREAM_URL} is being set in stream-url.txt by stream-keeper.py.
[Unit]
Description = Restream
BindsTo = network-online.target
After = network.target network-online.target
[Service]
WorkingDirectory = /home/pi
StandardOutput = journal
StandardError = journal
Restart = always
RestartSec = 0
TimeoutStopSec = 3
StartLimitInterval = 0
User = pi
EnvironmentFile = /home/pi/stream-url.txt
ExecStart = ffmpeg \
-loglevel warning \
-nostdin \
-stats \
-xerror \
-thread_queue_size 256 \
-fflags nobuffer \
-rtsp_transport tcp \
-stimeout 3000000 \
-i ${STREAM_KEEPER_STREAM_URL} \
-codec copy \
-flags +cgop \
-hls_time 2 \
-hls_list_size 4 \
-method PUT \
-http_persistent 1 \
'https://a.upload.youtube.com/http_upload_hls?cid=<cid>©=0&file=live.m3u8'
[Install]
WantedBy = multi-user.target
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