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| Who | What | When |
|---|---|---|
| demhlyr | and it takes several dozen to hundreds of attempts | [13:21] |
| b0000n | hello, a question: has someone used a RTL2838 dtv stick to tune isdb-t channels? | [01:21] |
| when i use $ dvbv5-scan ar-Argentina
it fails | [01:27] | |
| .......................................................................................................................................................................................................... (idle for 16h45mn) | ||
| mchehab | b0000n: most rtl283x devices don't really have support for ISDB-T
although some are sold as if they would support 1-Seg those devices actually do ISDB-T decoding in software | [18:12] |
| b0000n | ok | [18:13] |
| mchehab | currently, I don't know any open source software decoder for ISDB-T | [18:14] |
| b0000n | i was asking because in windows it can decode a channel where i am | [18:14] |
| b0000n_ | i was saying | [18:18] |
| *** | b0000n has quit IRC (Quit: b0000n)
b0000n_ changes his alias to b0000n | [18:18] |
| b0000n | because in windows it is possible
at least with the dongle that i have and i buy it as a dvb-t in aliexpress (also are the logs of the channel not working?) | [18:19] |
| mchehab | b0000n: the driver comes with a software decoder on windows
the device sends samples to the software decoder, using SDR mode you can use your dongle on SDR mode on Linux too | [18:26] |
| b0000n | in windows? | [18:27] |
| mchehab | but you'll need a software decoder
in userspace | [18:27] |
| b0000n | yeah i bought it for sdr and because it was cheap | [18:27] |
| mchehab | yes, it is cheap because it is crap ;)
(at least for isdb-t) it is just 1-seg (as the SDR doesn't provide enough samples to decode the full 6MHz spectrum) and probably requires a lot of CPU for decoding ISDB-T | [18:27] |
| b0000n | a yeah | [18:29] |
| awalls | SDR always requires a lot of CPU to do anything useful. | [18:29] |
| b0000n | in windows doesnt seem to suck much cpu | [18:29] |
| devinheitmueller | awalls: hey! Long time no see! | [18:31] |
| b0000n | so in short it isnt gonna have isdb-t support in the mean time | [18:31] |
| awalls | Hey devinheitmueller. | [18:31] |
| devinheitmueller | Nobody is going to bother writing a userland decoder while hardware solutions are so cheap. It's the same thing as "Winmodems" back in the 1990's.' | [18:32] |
| awalls | http://lists.gnu.org/archive/html/discuss-gnuradio/2013-12/msg00462.html | [18:32] |
| b0000n | seems rasonable | [18:32] |
| devinheitmueller | awalls: Sorry, should have been more clear - I mean aside from GNU radio. | [18:32] |
| awalls | Not even a good implementation for GNURadio yet. | [18:33] |
| devinheitmueller | And of course GNU radio isn't going to expose the decoded stream in a way that the standard applications will supporrt. | [18:33] |
| awalls | University and research type stuff. | [18:33] |
| b0000n | and how it is possible to support dvb-t? it does it in hardware? | [18:33] |
| devinheitmueller | awalls: CrestaTech had a pretty nice solution from what I hear. | [18:34] |
| awalls | b0000n: DVB-T is demodulated in hardware and an MPEG-TS is output by the chip, usually. | [18:34] |
| mchehab | b0000n: yes, it does dvb-t in hardware
the dvb-t decoder is integrated at this realtek chipset | [18:34] |
| awalls | awalls googles the CrestaTech | [18:35] |
| devinheitmueller | s/crestatech/xceive/ | [18:35] |
| awalls | Ah.
SDR tuners from the old SDR tuner people | [18:35] |
| devinheitmueller | Speaking of demods, have you seen what silabs has been up to lately?
http://www.silabs.com/products/video/demodulator/Pages/si218x.aspx Single chip: ISDB-T and DVB-T2/C2/S2X/S2/T/C/S Digital Demodulator* | [18:36] |
| awalls | Ooh viterbi on chip. | [18:37] |
| devinheitmueller | Although not in the headline, it also does QAM-B (i.e. ClearQAM for US)
No 8vsb though. | [18:38] |
| awalls | Hmmm. They have hardware demods followed by DSP.
So yeah, they'd have to add an 8-VSB demod to the chip Err wait, maybe I just don't understand the block diagram | [18:38] |
| devinheitmueller | Pretty nice though. If it had 8vsb then it would take care of 99% of my customer use cases with a single chip. | [18:39] |
| awalls | Yeah it looks nice. | [18:40] |
| devinheitmueller | They have a whole series of dual demods two, essentially at the cost of going from a 7x7mm footprint to 8x8mm. | [18:41] |
| awalls | I've been doing a lot of high throughput SDR stuff lately. (Chew up 18 cores on a 32 core x86_64 machine) | [18:41] |
| devinheitmueller | Nice.
With a system that fast it could probably compile the whole Linux kernel in less than 30 minutes. :-) | [18:41] |
| awalls | It's nice, but the fans are noisy. :P | [18:42] |
| devinheitmueller | I would imagine. | [18:42] |
| awalls | awalls needs to get back to his annual report contract deliverable instead of stalling in IRC :)
ttyl | [18:43] |
| devinheitmueller | I did a boot loader project some years back on such a platform (where I needed to be able to physically whack the switch). I think it caused hearing loss.
Ok, ttyl. | [18:43] |
| awalls | b0000n: https://github.com/git-artes/gr-isdbt | [18:44] |
| b0000n | thanks will try to compile later | [18:45] |
| *** | tuxuser changes his alias to fluxuser | [18:59] |
| .... (idle for 16mn) | ||
| b0000n | another thing... how i can see in windows if the hardware is spiting the raw signals it get or if it is spiting a mpeg stream? | [19:15] |
| devinheitmueller | USB analyzer?
https://wiki.wireshark.org/CaptureSetup/USB#Windows I've used this one before: http://www.pcausa.com/Utilities/UsbSnoop/ | [19:16] |
| b0000n | nice | [19:18] |
| devinheitmueller | If money isn't a concern, these work great: http://www.totalphase.com/products/beagle-usb480/ | [19:19] |
| ...... (idle for 25mn) | ||
| joao | hola | [19:44] |
| *** | joao has quit IRC (Quit: joao) | [19:45] |
| b0000n | money is a concern. thanks for the help | [19:56] |
| .... (idle for 15mn) | ||
| *** | b0000n has quit IRC (Quit: b0000n) | [20:11] |
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