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fsphil / hacktv

Analogue TV transmitter for the HackRF
GNU General Public License v3.0
669 stars 80 forks source link

Multiple Noob Questions #89

Closed RandomPSPguy closed 2 years ago

RandomPSPguy commented 2 years ago

So I don't have a hackrf yet but am planning on getting one for hacktv. I have no experience with sdr's. Would this work well with a raspberry pi zero w? I believe the ffmpeg would be too much for live encoding but I saw you are able to render to a file. example: -o B:\output.bin -m ntsc-fm -s 18000000 "O:\SHOWS\05 Warren.m4v"

Would I be able to make a 15 hour broadcast and render it to that file and play that back on the hackrf without lagging out on the pi zero? If so how would I go about doing that? Reason I want the pi zero so bad is I am going mobile and want as little power consumption as possible.

How is the osmo-fl2k? It is tempting since it's cheap but I heard it drifts frequency. Also would I be able to use the osmo with this on usb 2.0?

Unrelated to the software itself but where would I find an amplifier for low vhf? specifically channel 2 ntsc. I'd like somewhere between 5 to 50 watts. Yes I know the laws regarding this.

fsphil commented 2 years ago

If you're are intending to transmit regular NTSC video you'd be better skipping the hackrf and using omxplayer and the Pi's own composite NTSC output into an RF modulator.

RandomPSPguy commented 2 years ago

Thanks, I was planning on doing that till I saw this project, I guess i'll go back to a modulator though. My thinking was just that rca and a modulator is inherently a little messy so by using this I could skip all of that and get the cleanest signal possible.

fsphil commented 2 years ago

The hackrf adds some noise to the output and this is visible in the image. A good quality RF modulator will probably beat it for image quality.

RandomPSPguy commented 2 years ago

Oh. That's a shame. Thanks for telling me about omxplayer though!