HF ATV - video compression possible? Adventure in minimalism.

[AD7N]

ATV (in the normal sense) requires massive bandwidth.

What I'm curious is if there are any open-source video codecs that could be used to compress video down enough to shoehorn it into a 300bit/s stream.

This is a minimalist adventure in determining the absolute barest requirements in building a video stream :D

It would be black/white, absolutely micro resolution, slow frame rate...

What would *really* make it work though is only the *difference* between frames is sent, not the entire frame. This assumes perfect copy, but for the purposes of this discussion let's assume almost perfect copy. Assuming the bit/rate was low enough, some form of error correction could be incorporated, maybe.

Anyone ever play with something like this?

[AG3Y]

Could some adaptation of the old Bell System videophone be used? I believe they sent pictures over telephone lines. That would be pretty limited bandwidth, but I seem to remember that there was a modicum of motion there, and the definition was high enough to recognize faces, etc.

[AD7N]

Narrow-Band Television apparently exists: http://www.qsl.net/zl1wtt/nbtv.htm

Already on air!