Go (golang) implementation of TCP-Friendly Rate Control for smooth and adaptive video streaming over unreliable networks.

SlowCast dynamically adjusts video encoding bitrate based on network conditions using the TCP-Friendly Rate Control (TFRC) algorithm.

This implementation follows RFC 5348 for the TFRC algorithm and RFC 8083 for RTP/RTCP extensions.

Install required libraries:

sudo apt update
sudp apt-get update && apt-get install -y \
    gstreamer1.0-tools \
    gstreamer1.0-plugins-base \
    gstreamer1.0-plugins-good \
    gstreamer1.0-plugins-bad \
    gstreamer1.0-plugins-ugly \
    gstreamer1.0-libav \
    gstreamer1.0-x

# Clone the repository
git clone https://github.com/arsperger/slowcast.git
cd slowcast

# Build the application
go build

# Basic usage with default settings (localhost streaming)
./slowcast

# Stream to a remote host
UDP_SINK_HOST=192.168.1.100 UDP_SINK_PORT=6000 ./slowcast

# Configure source address and port
UDP_SRC_HOST=192.168.1.5 UDP_SRC_PORT=6010 ./slowcast

SlowCast uses environment variables for configuration:

Additional parameters (currently hardcoded):

• Min bitrate: 500 Kbps
• Max bitrate: 4000 Kbps
• Initial bitrate: 500 Kbps
• Bitrate update interval: 500ms

• Fixed packet size assumption may reduce accuracy for variable size packets
• No dynamic resolution/framerate adjustment based on bitrate changes
• new to come

• Dynamic resolution and framerate adaptation based on available bandwidth
• Better zero-loss handling algorithm (trend detection)
• Bandwidth probing for faster convergence
• Enhanced congestion detection beyond packet loss (jitter)
• Monitoring and dynamic configuration
• Implement Circuit Breakers RFC8083

@arsperger