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Stream Android Screen to PC

Discussion in 'Android Media' started by walfish3d, Nov 22, 2010.

  1. walfish3d

    walfish3d New Member
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    Nov 22, 2010
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    Hello people this is my first post here *wave*

    I know there is already a thread with exactly the same title, but not exactly the content i need.

    What i would like to do with my android phone is to stream everything which is displayed on my phone to my pc. either via wlan or usb, i dont care (whatever works). I am NOT searching for an app which lets me control my android from my pc. I would only like to see on my computer screen whatever is shown on my android phone. I'd say my android should behave like an expansive webcam :).

    The only 'app' I found so far which is capable of this is 'androidscreencast' androidscreencast - Project Hosting on Google Code
    It's a nice application and it basically does what I described above, but with 3-4 fps it just performs way too bad.

    Any pointers?
     

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  2. sitlet

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    Apr 11, 2010
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    good luck...
     
  3. Demache

    Demache Well-Known Member
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    Apr 18, 2010
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    androidVNC is probably the closest you'll get. But its intended for controlling it, and it still has the similar drawback of having low FPS (not sure if its my phone or the way its capturing it). Regardless, you're not going to find anything that is like a smooth video stream.
     
  4. CptGemini

    CptGemini Well-Known Member
    43

    I know of someone working on something to do the oposite, they are working on an app to make your android screen an extra monitor for your PC.
     
  5. walfish3d

    walfish3d New Member
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    Nov 22, 2010
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    thanks for your answers, unfortunately not what I hoped for :)
    can someone provide a technical explanation why this stuff performs so bad? What is the bottleneck?
     
  6. Palmetto Fellow

    Palmetto Fellow Well-Known Member
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    Sep 24, 2010
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    I suspect that the bottle neck is in the app needing to take snapshots, package them, and then send them across the network. I assume this is how it works, but I am not sure. Maybe it does something else.

    When I use a screen capture program, the images are all 500K on average. 4FPS means capturing 2MB worth of data, and then sending that over a communication medium.

    2MBytes = 16Mbits

    I don't know much about HD encoding. I do know that H264 is pretty good at compression, but I haven't found concrete numbers on google yet to tell me how much bandwidth it needs.

    I did see a mention of 8Mbps for HD video using H264 (MPEG-2 would require 15Mbps).

    So with HD compression, we can get 30fps of HD content in 8Mbps of bandwidth...but when taking snapshots which become jpgs, we can't even come close to 30fps in 8Mbps. As shown above, 4 screenshots requires 16Mbps.

    I suspect that the app would have to capture the video before the screen displays it. Perhaps it can grab the stream, encode it, and then send it on it's way. HDMI ports should be used for this sort of thing IMHO, and on some phones, media content is routed over HDMI, but not the phone's desktop. I wonder why there is a limitation there.
     
  7. Adamx

    Adamx Well-Known Member
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    Apr 16, 2010
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    actually there are a couple apps that can do this via usb connection. I don't see why wifi can't do the same on the same network.
     
  8. adaaaam

    adaaaam Well-Known Member
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    Oct 25, 2010
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    My Galaxy S II hooked up to my HDTV, which displays everything as a mirror display, at a high framerate, launcher interactions and all. My coworker's older HTC Evo 4G could only route video. My guess is all phones with MHL support routes everything now, so if your pc display has an hdmi port youre good to go, unless you specifically wanted it to run in the operating system and not just the display, which probably will only work at low framerates for now
     
  9. Virzi404

    Virzi404 New Member
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    Aug 21, 2012
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    I came here with the same question. I want to walk around a room, tablet or phone in hand (I don't care which), running a presentation through a prjector. If you can mirror a TV or projector via an HDMI cable, then perhaps what we want to do can be done as long as you have two Android devices. I have phone and a tablet, and I understand there are apps that let one control the other. If that's true, perhaps I could connect either one to a projector via HDMI and operate it from the other while walking the room. Thoughts?
     

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