Last year I set myself a goal to transmit low resolution digital video with the LimeSDR-mini.
High resolution video using DVB-T / DVB-T2 has been done, as Evariste showed us a while ago.
Myself I went for the other end of the spectrum. How much RF bandwidth is it really necessary to broadcast a digital video signal that can still be usable (larger than a post stamp)?
So my software uses a 250 kbit/s DQPSK modem which fits the radio signal in 150 KHz, about the same bandwidth as commercial FM. The video size is not great, 320 x 240 upscaled to 640 x 480 which is why it resembles Minecraft.
Seems to be enough to at least show a face. As a bonus fits well in the 433 MHz ISM band should you lack an amateur radio license.
See the demo here: https://www.youtube.com/watch?v=z3yfNW8g-JI
Also, since all the code is open source, I’d like to raise a challenge to LimeSDR hackers: how much narrower can you get a signal that can transmit the same resolution as above? Any video compression algorithm goes as long as it uses open source code.