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| pk__ | hi | 08:10 |
|---|---|---|
| pk__ | i am pankaj i am a developer at vlc media player team | 08:13 |
| pk__ | i am trying to make a device which could take hdmi input and encode the video as well as audio and stream through wifi | 08:14 |
| pk__ | opposite to chromecast | 08:14 |
| pk__ | i came across your project but i have a little confusion | 08:14 |
| pk__ | https://github.com/timvideos/HDMI2USB/wiki/Resolutions in this page you calculated bandwidths of several resolutions..how are you guys able to stream such high bandwidth streams through usb | 08:15 |
| tpb | <http://ln-s.net/-k$b> (at github.com) | 08:15 |
| mithro | We only support 720p and mjpeg gives 70% reduction in bandwidth | 08:41 |
| mithro | (At full frame rate) | 08:41 |
| mithro | If you are around in 2 hours I can tell you more. | 08:42 |
| pk__ | mithro: yes i will be online | 08:43 |
| pk__ | ping me back i will wait for oyu | 08:43 |
| mithro | pk__: I'm around now | 09:59 |
| pk__ | hi | 09:59 |
| pk__ | so you are doing mjpeg in hardware? | 10:00 |
| mithro | yes | 10:06 |
| mithro | pk__: so the device is based around a Spartan 6 FPGA | 10:09 |
| pk__ | yes i also have atlys | 10:10 |
| pk__ | yes i also have atlys;) | 10:10 |
| pk__ | so i hope it would be easy to use it as it is | 10:10 |
| pk__ | have you planned an actual device also? | 10:11 |
| mithro | pk__: yes, we are currently in the process of creating our own PCB | 10:12 |
| mithro | pk__: btw you should also join #hdmi2usb | 10:12 |
| mithro | pk__: I mean #timvideos | 10:13 |
| mithro | pk__: If you have an Atlys board, you can get up and running very quickly | 10:13 |
| pk__ | okay | 10:13 |
| mithro | pk__: would love help making the documentation eaiser :) | 10:13 |
| pk__ | certainly i would love to contribute | 10:14 |
| pk__ | u from electronics background? | 10:14 |
| pk__ | and have you been able to capture audio from hdmi as well? | 10:17 |
| pk__ | i was trying the digilent's hdmi capture core and it is not exactly an hdmi but basically a dvi receiver core only | 10:18 |
| pk__ | have you used that or a proper hdmi capture core? | 10:18 |
| mithro | pk__: I'm from an electronics background | 10:18 |
| mithro | pk__: we haven't done any HDMI audio stuff, our primary focus has been on capture for presentations | 10:18 |
| pk__ | okay let me just go through the code and try it once ..then i will bother you again | 10:22 |
| pk__ | primarily which channel do you use hdmi2usb or timvideos | 10:23 |
| mithro | timvideos channel is the primary one | 10:23 |
| pk__ | i just bought a win8 laptop | 10:25 |
| pk__ | earlier i used winxp and ubuntu | 10:25 |
| pk__ | i am not sure how good ISE works on win8/. you tried? | 10:26 |
| mithro | Never used ISE on Windows | 10:27 |
| pk__ | hmm | 10:28 |
| pk__ | why we are modifying the cypress chip's code? | 10:30 |
| pk__ | cant we simple use the other usb port on atlys | 10:31 |
| pk__ | to implement uvc class? | 10:32 |
| mithro | no, the other USB port is a USB host port | 10:35 |
| mithro | for plugging in things like keyboards and mice into the Atlys board | 10:35 |
| pk__ | ohoh right | 10:37 |
| pk__ | no microprocessor core ? | 10:38 |
| mithro | we have a little core for doing the processing of commands like switch video inputs and such | 10:42 |
| pk__ | okay | 10:42 |
| pk__ | free ise webpack would be enough to build? | 10:43 |
| mithro | yes | 10:43 |
| mithro | pk__: we have prebuilt firmware if you want to play with that first | 10:44 |
| pk__ | yeah i saw that but ultimately i will need to hack :) | 10:44 |
| pk__ | any plan to create an asic later? | 10:45 |
| pk__ | or already ;) | 10:45 |
| pk__ | i will play with prebuilt firmware just to see the quality of mjpeg encoding | 10:46 |
| pk__ | how much bandwidth it is after mjpeg? | 10:46 |
| pk__ | for 720p@50Hz | 10:46 |
| mithro | nah, a FPGA is too flexible | 10:47 |
| mithro | lets us upgrade as we add new features | 10:47 |
| pk__ | but in the end fpga for mass production wont be too costly? | 10:48 |
| pk__ | how much do you think a single device will cost ? | 10:50 |
| mithro | FPGAs are suprisingly cheap | 10:50 |
| mithro | I'd like to see the budget device under $100USD when mass produced | 10:50 |
| mithro | It should easily be under $200 USD | 10:51 |
| pk__ | hmm but even 200 is too costly at least here in my country :( | 10:53 |
| pk__ | anyways will see | 10:53 |
| mithro | an ASIC isn't going to drop the cost that much | 10:54 |
| pk__ | ohh i thought asic always reduce the cost of production | 10:54 |
| pk__ | maybe when millions of them are made :P | 10:55 |
| mithro | pk__: yeah, you need to be in the millions of units for it to make sense | 10:55 |
| pk__ | what do you do otherwise..for living? just curious how much time you give to this project | 10:57 |
| mithro | I work for Google as a Software Engineer | 11:01 |
| pk__ | cool :) | 11:01 |
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