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Wireless HDMI for Everyone

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Re: Wireless HDMI for Everyone

#101

Post by shubb »

mootothemax wrote: post #44
mihaifm wrote: post #41

Earlier quoted context omitted.

I just want a fast way to mirror my computer screen onto the TV (wirelessly). Does DLNA support this? From the description it's not clear. On the other hand I can clearly see that this project supports it, "Duplicate your screen" is the first feature listed there.

Does DLNA support this? From the description it's not clear. Honestly, I've no idea; if you like I can have a play tonight when I get home and let you know? I can clearly see that this project supports it, "Duplicate your screen" is the first feature listed there. Hah, that's quite funny; if you skip to the "Use Cases" section, it's all about consuming media, whereas the screen mirroring is highlighted as an extra fe…

I came up with a hack to do this. Basically I streamed my screen into a file, and then served that file with a DNLA server (which transcoded it into something the TV would eat).

The result was pretty because source -> youtube -> my screen -> mp4 -> mpeg.

Although it won't be so bad, I really see re-encoding artefacts being the problem here. Although Wireless N can have enough bandwidth to send video at a good quality.

Re: Wireless HDMI for Everyone

#102

Post by 0x0 »

hrktb wrote: post #7

What strikes me is how the Apple TV is really in the "good enough" zone for iOS and recent Macbook users. After so many years there's no clearly better solutions to show some random content on the TV.

I had a guest come over to show a video recorded on their iphone via airplay; when the video was about to start the apple TV flunked out with a HDCP error. I'm sure the digital rights owner(1) of the video appreciated that.

(1) my guest who recorded the video with his own phone.

Re: Wireless HDMI for Everyone

#104

Post by sp332 »

alasano wrote: post #50
mihaifm wrote: post #41

Earlier quoted context omitted.

I just want a fast way to mirror my computer screen onto the TV (wirelessly). Does DLNA support this? From the description it's not clear. On the other hand I can clearly see that this project supports it, "Duplicate your screen" is the first feature listed there.

Chromecast has this feature, you can cast a tab or the entire screen in the beta option. I can stream a movie this way over wireless G, I imagine with a good N router there's a difference.

Chromecast is limited to 720p @ 5Mb/s. It's nowhere near HDMI quality.

Re: Wireless HDMI for Everyone

#105

Post by amalag »

hnal943 wrote: post #88
amalag wrote: post #70

Earlier quoted context omitted.

I don't think it is legal to transmit on those frequencies, thats what the stations pay big bucks for.

Radio stations pay big bucks to broadcast on the FM frequencies, and yet they make FM Transmitters for your car. Why wouldn't DTV be the same?

Thats a good point, I didn't think of that. The FCC did make some allowance for low power FM transmitters, probably because they couldn't control it anyway. I see some people selling similar low power TV transmitters, but I don't know why it isn't more common. Since it is more complex than the FM transmitters and more of a risk, I wonder if the lack of FCC regs has stopped it in the US.

Re: Wireless HDMI for Everyone

#106

Post by webjprgm »

bloopletech wrote: post #77

Back of the envelope calculation: (1920 * 1080 * 3 * 60) / 1024.0 / 1024.0 => 355.96 MB/s 300mbps wireless n: 300 / 8.0 => 37.5 MB/s Given that the whole point of HDMI is image quality, how are they going to shove 355MB/s through a 37.5MB/s link without lowering the quality hugely? It all seems rather pointless to have a large, high quality display and content, and force it through a small link.

Also remember that most of the time you have two hops on your wifi network: PC -> router -> TV. (Newer wifi cards can skip the router if the software on both sides supports it.)

Re: Wireless HDMI for Everyone

#107

Post by benjamincburns »

I'm really sad I don't have the funds to commit right now for the hacker version, however I'll definitely buy one when it comes out. I was really hoping that ChromeCast would've been what this is claiming to be. Please do show up Google on this front.

In the mean time if the people behind the AIRTAME are reading this, I'd love to see something like this with support for HDMI Ethernet Channel, since this will half the amount of wireless congestion AIRTAME would cause. I'm under no illusion that this will be added to the first version (I know what hardware dev is like), but it's something to consider for the future.

Re: Wireless HDMI for Everyone

#108

Post by dublinben »

warcode wrote: post #65

It is not "Wireless HDMI" until I plug something in the HDMI port of my PC and the HDMI port of my TV and it "just works". Playing games on the output of a 1080p @ 60fps with 3-5k bitrate encoder causes massive delay.

Here you go. This is a real 'wireless HDMI' solution from an established AV company.

http://www.dvdo.com/air3/index.aspx

Re: Wireless HDMI for Everyone

#109

Post by adestefan »

amalag wrote: post #105
hnal943 wrote: post #88

Earlier quoted context omitted.

Radio stations pay big bucks to broadcast on the FM frequencies, and yet they make FM Transmitters for your car. Why wouldn't DTV be the same?

Thats a good point, I didn't think of that. The FCC did make some allowance for low power FM transmitters, probably because they couldn't control it anyway. I see some people selling similar low power TV transmitters, but I don't know why it isn't more common. Since it is more complex than the FM transmitters and more of a risk, I wonder if the lack of FCC regs has stopped it in the US.

Low power FM refers to a specific class of licenses[1] and not the little radio dongles.

[1] http://www.fcc.gov/encyclopedia/low-power-fm-broadcast-radio...

Re: Wireless HDMI for Everyone

#110

Post by MichaelApproved »

transfire wrote: post #63

What baffles me is that every TV sold today already has a wireless DTV receiver built into it! You know, that one that you can hook rabbit ears to, and the one so few people actually use. Can someone please explain to me why no one builds transmitters for these?

That won't help you broadcast to a projector. Working with an HDMI connector, you solve the problem for both TVs and projectors.
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