Receiving NTSC Analogue TV with GNU Radio and an RTL-SDR
Over on GitHub user kik has uploaded a tutorial and code showing how to decode NTSC analogue TV in GNU Radio and an RTL-SDR. The tutorial is in Japanese, but Google translate should be good enough to understand the text. Kik shows us what GNU radio blocks to use and provides the python code needed to display the images on a simulated scope.
If you just want to receive analogue TV signals, try TVSharp.
It’s possible to use standard “Video SDL Sink” to output TV image (instead of custom blocks), but I didn’t found out way to do proper vertical sync with it. However you can clearly see TV image, you don’t even need sawtooth generators.