Re: WinTV HVR-900 (usb 2040:6500) (model 65008) / no audio but clicking noise
hi! i was able to find an antenna position/orientation that allows good quality for 7 stations with SNR above 0x78... *wag tail* up to 4 stations with just one stick at the same time... *w00t* so it is not as urgent as before that the analog audio part works... thx... bye arne -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: WinTV HVR-900 (usb 2040:6500) (model 65008) / no audio but clicking noise
Hi! Since I really need analog TV support, I would like to bring this up again... :-) Now i hacked the em28xx module, so that it would try to get the audio data via the em28xx_alsa module... But that fails in the usb_submit_urb() call in the em28xx_init_audio_isoc() function, because: wMaxPacketSize of endpoint 0x83 is 0... Does someone still know how em28xx_alsa was to be used properly? Is there some specialist, that could help me? Markus R. doesnt like to do open src things anymore, or did I misunderstand that? Btw: I have an em2882/em2883 chip, which needs to be handled by the em28xx_alsa module according to this page: http://www.linuxtv.org/wiki/index.php/Em28xx_devices#em2880.2F2881.2F2883 Here is the em28xx related syslog from my box: https://bugzilla.redhat.com/attachment.cgi?id=481332 Bye Arne -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: WinTV HVR-900 (usb 2040:6500) (model 65008) / no audio but clicking noise
yesterday i wrote: Now I bought a Hauppauge WinTV HVR-900 (USB, DVB-T/analog Hybrid). today i found that i have quite good DVB-T connectivity... but sometimes there r too many errors... so i m still interested in analog tv... after some rebooting and after i dropped a lot of firmware files from http://konstantin.filtschew.de/v4l-firmware/firmware_v3.tgz into /lib/firmware (in addition to xc3028-v27.fw) i can hear the analog audio, but from time to time there is still this strong clicking noise... example: http://www.wgboome.de./20110226,hvr.mpg (i blurred the picture due to copyright considerations...)... could it be that i use the wrong amux? i found that theory here (but i dont know if i can just change the kernel module): http://www.freak-search.com/de/thread/332374/linux-dvb_em28xx-audio_hvr-900_b3c0_id_20406502_hauppa -arne -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WinTV HVR-900 (usb 2040:6500) (model 65008) / no audio but clicking noise
Hi! Now I bought a Hauppauge WinTV HVR-900 (USB, DVB-T/analog Hybrid). video is ok... But: Audio sounds almost as bad as before (with that Pinnacle stick): http://www.wgboome.de./hvr900.wav I used this mplayer command: mplayer -tv driver=v4l2:input=0:width=768:height=576:device=/dev/video2:alsa=1:forceaudio=1:adevice=hw.1:audiorate=48000:immediatemode=0:amode=0:norm=pal:chanlist=europe-west:freq=280 tv:// The difference to the Pinnacle thingy is: The correct audio isnt even in the background... I hear just that clicking noise... What did I do wrong? PS: With my PCI PVR-250 i have no problem... Thx. Bye Arne -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: PCTV USB2 PAL / adds loud hum to correct audio
Andy Walls wrote:
I find audio at 8 ksps very unusual for a TV capture device.
I tried it with pulseaudio at 44100 samples/sec
and with some commercial tuned in...
(no big copyright problem hopefully) :-)
i used this command:
parec --device=alsa_input.hw_1 blah.raw
resulting raw data: http://www.wgboome.de./blah.raw
The data set contains no large positive values
(nothing in the range 0x1000-0x7fff).
Now the noise is in the positive range, 2...
I made a new filter program (see appendix),
that produces acceptable but still distorted sound.
filter output: http://www.wgboome.de./blah.ogg
The valuex 0x10 and 0x80 do remind me of the YUV values for black: Y =
0x10, U = 0x80, V = 0x80. Maybe some video data is getting thrown in
with the audio?
sounds good...
because: the unwanted data changed its range now...
-arne
appendix:
...
(buf[i]/256=0x80 buf[i]/2560xC0) ||
(buf[i]/256=0x40 buf[i]/2560x80)) {
...
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Re: PCTV USB2 PAL / adds loud hum to correct audio
Devin Heitmueller dheitmuel...@kernellabs.com wrote:
When I use this command simultaneously:
arecord -D front:CARD=PAL,DEV=0 -f S16_LE -c 2 -r 8000 /aux/tmp/bla.wav
I get correct audio with strong noise:
http://www.wgboome.de./bla.wav
(it is from input=1 for copyright reasons... so there is silence plus
noise)
The -r argument should almost certainly be 48000, not 8000.
Maybe...
That device is rather old...
And i didnt tell pactl anything about sample rate...
With the filter from the appendix the noise is gone...
But it feels like a dirty hack, because it would cut out (overly?) loud noise,
2...
My wild guess is, that the usbaudio driver injects some bad samples
(0x8000..0x9000) every appr. 256 bytes...
-Arne
appendix:
#include stdint.h
#include unistd.h
int main() {
uint16_t buf[100];
const int r = read(0,buf,sizeof(buf));
for (int i=0; i*sizeof(*buf)r; i++) {
if (buf[i]/256=0x80 buf[i]/2560x90) continue;
if (write(1,buf+i,2) != 2) break;
}
return 0;
}
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