My apologies if this post is asking an obvious question. I'm completely new to Roku and just ordered my first Roku device this afternoon so that I could try out addressing this need, so I haven't had the chance to investigate this on the device iteself yet.
I'm trying to find a way to wirelessly mirror a Win8 tablet or Win7 PC screen onto a TV via wifi. I don't need full motion video, just a periodic refresh of the screen...an update every 1-5 seconds would be ideal to keep the bandwidth requirement low....I'd be running 4 to 12 setups like this simultaneously on the same wireless network.
A Raspberry Pi running VNC would be perfect for me, except that supply of the devices is limited and unrelaible. I've already used a few different types of WiDi devices for this purpose and they work spectacularly in small numbers. The only problem is that they stream full 1080p HD video so they require a large chunk of spectrum. That means only 3 of them can be operated in a given area without interference. With 4 in use simultaneously they start to conflict with each other and drop signals, and with 5+ they don't work at all.
I've read through numerous posts about doing this with a Roku Photobridge device, but it looks like those are no longer available.
The Roku doesn't handle live video very well. There's always a pretty large latency involved, at least for HLS. I just did a quick test using VLC to transcode my screen to HLS and then displayed it on my TV. There was probably a minute or more between when something changed on my computer screen and it appeared on my TV, so not so good for real-time screencasting. There's also no sound. I'm not sure if VLC can handle sound or not. If the large delay isn't a problem, then it might be possible and there's probably other ways of converting your screen to HLS. LIve Smooth Streaming may also be a possibility, but I don't know much about that.