dthakur / latency-tester

Latency tester using QR codes

Latency tester

Methodology

1. Generate a 60 fps video of QR codes
2. Process the video through the transmission system
3. Record a side-by-side video of the original and transmitted stream
4. Run through analyze.js script to get the latency numbers

Intended use

Measure end-to-end latency of RC VTXs, analog to digital video converters etc

Video generation

This is not needed if you use the pre-generated video sync.mp4.

1. Use generate-images.js to create the raw pngs
2. Run the command ffmpeg -r 60 -s 1024x768 -i output/%07d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p sync.mp4 to generate video

Notes:

• Generation is for 60 fps, which means the lowest latency measurement will be ~17ms.
• Code is not optimized, takes a while

Analysis

TODO