RTP Packet Analyzer

This project provides a Python script for analyzing RTP (Real-time Transport Protocol) packets from a pcap file. It focuses on extracting video frame information and visualizing the capture times and sizes of frames.

Features

• Reads and processes RTP packets from a pcap file
• Identifies video frames based on RTP marker bits
• Calculates frame sizes by aggregating packet sizes
• Generates an interactive scatter plot of frame capture times vs. frame sizes
• Supports multiple SSRC streams with color-coding
• Provides zoom, pan, and reset view functionalities for the plot

Requirements

• Python 3.6+
• scapy
• matplotlib
• tqdm
• numpy

You can install the required packages using pip:

pip install scapy matplotlib tqdm numpy

Usage

1. Clone this repository:

   git clone https://github.com/yourusername/rtp-packet-analyzer.git
   cd rtp-packet-analyzer
   

2. Place your pcap file in the same directory as the script, or update the pcap_file variable in the script with the path to your pcap file.

3. Run the script:

   python offline_rtp_analyzer.py
   

4. The script will process the pcap file and display an interactive scatter plot.

Interacting with the Plot

• Use the navigation toolbar at the bottom of the plot window for zooming and panning.
• Click the 'Reset View' button to return to the original view.
• Hover over points to see exact values.
• Use the legend to toggle visibility of different SSRC streams.

Understanding the Output

• Each point on the scatter plot represents a video frame.
• The x-axis shows the capture time of the first packet of each frame.
• The y-axis shows the total size of each frame in bytes.
• Different colors represent different SSRC streams.

Limitations

• The script assumes RTP packets with payload type 101. Modify the is_rtp_packet function if your packets use a different payload type.
• Large pcap files may require significant processing time and memory.

Contributing

Contributions to improve the script or add new features are welcome. Please feel free to submit pull requests or open issues for bugs and feature requests.

License

This project is licensed under the MIT License - see the LICENSE file for details.