hlsawait

hls-await

This is a work-in-progress monitor for HLS streams to detect activity via perceptual hashing.

Currently it monitors a feed of North Korea TV and posts screencaps to Twitter.

Features / TODO

• Roku Stream Tester launching partially
  • HTTP cache for segments saves bandwidth
• Twitter
  • Command via DM Increases rate, kill switch, change perceptual hashing threshold
  • Resume threads on restart.
• Process separation of ffmpeg / CGO. This deserves a writeup!
  • Passing FDs over Unix sockets
  • Internals of Go's new fuzzing system - example of how to use a child process as an rpc service
• Find the most interesting images avoid blank screens
• Tweak the perceptual hash thresholds
• Revise the clunky FSM code.
• Test pattern detection

State Machine

Cgo dependencies

sudo apt-get install -y libavfilter7 libavdevice58 libavformat-dev libavcodec-dev libavdevice-dev libavutil-dev libswscale-dev libswresample-dev libavfilter-dev

Known to work on

• Ubuntu 21.10
• macOS - ffmpeg libraries installed via Hombrew. Not validated recently; suspect a bunch of work to be done.

System requirements

• Probably > 2 gigabytes of free memory?