some craziness: I don't have tda9887 module anymore in 2.6.19.2 version, but it existed in 2.6.17:
/lib64/modules/2.6.17-reiser4-r7/kernel/drivers/media/video/tda9887.ko Is it not needed anymore? Although I am not sure it was used earlier because I don't a working lsmod from that time. I do see some messages for it though: # dmesg|grep tda9887 tda9887 2-0043: tda988[5/6/7] found @ 0x43 (tuner) tda9887 2-0043: Data bytes: b=0x14 c=0x30 e=0x44 tda9887 2-0043: tda988[5/6/7] found @ 0x43 (tuner) tda9887 2-0043: Data bytes: b=0x14 c=0x30 e=0x44 tda9887 2-0043: Data bytes: b=0x14 c=0x30 e=0x44 If this module is not present, where are these messages coming from? Another thing I notice is that I don't see messages similar to the one you posted in another thread: Jan 22 23:42:06 londo kernel: [77899.335744] tuner 1-0061: Signal strength: 32768 Jan 22 23:42:06 londo kernel: [77899.336368] tuner 1-0061: Stereo: yes I see: pvrusb2: ================= START STATUS CARD #0 ================= cx25840 2-0044: Video signal: present cx25840 2-0044: Detected format: NTSC-M cx25840 2-0044: Specified standard: NTSC-M cx25840 2-0044: Specified video input: Composite 7 cx25840 2-0044: Specified audioclock freq: 48000 Hz cx25840 2-0044: Detected audio mode: stereo with SAP cx25840 2-0044: Detected audio standard: BTSC cx25840 2-0044: Audio muted: no cx25840 2-0044: Audio microcontroller: running cx25840 2-0044: Configured audio standard: automatic detection cx25840 2-0044: Configured audio system: BTSC cx25840 2-0044: Specified audio input: Tuner (In8) cx25840 2-0044: Preferred audio mode: stereo tda9887 2-0043: Data bytes: b=0x14 c=0x30 e=0x44 tuner 2-0061: Tuner mode: analog TV tuner 2-0061: Frequency: 55.25 MHz tuner 2-0061: Standard: 0x0000b000 wm8775 2-001b: Input: 2 pvrusb2: cx2341x config: pvrusb2: Stream: MPEG-2 Program Stream pvrusb2: VBI Format: No VBI pvrusb2: Video: 720x480, 30 fps pvrusb2: Video: MPEG-2, 4x3, Variable Bitrate, 6000000, Peak 8000000 pvrusb2: Video: GOP Size 12, 2 B-Frames, GOP Closure, No 3:2 Pulldown pvrusb2: Audio: 48 kHz, Layer II, 224 kbps, Stereo, No Emphasis, No CRC pvrusb2: Spatial Filter: Manual, Luma 1D Horizontal, Chroma 1D Horizontal, 0 pvrusb2: Temporal Filter: Manual, 8 pvrusb2: Median Filter: Off, Luma [0, 255], Chroma [0, 255] pvrusb2: ================== END STATUS CARD #0 ================== Does it look clean? -devsk ----- Original Message ---- From: Mike Isely <[EMAIL PROTECTED]> To: Communications nexus for pvrusb2 driver <[email protected]> Sent: Monday, January 22, 2007 10:05:21 PM Subject: Re: [pvrusb2] audio pops and cracks in the recordings On Mon, 22 Jan 2007, devsk wrote: > After 1.5 hours, I have booted back into linux and I can immd. see that I > don't have to wait for even 45 seconds on pbs to make it produce pops. > > I notice this occurring in the mythtv logs pretty often, but its not there > for every pop. > > 2007-01-22 19:16:34.386 WriteAudio: buffer underrun > 2007-01-22 19:16:34.536 NVP: prebuffering pause > > -devsk > > ----- Original Message ---- > From: devsk <[EMAIL PROTECTED]> > To: Communications nexus for pvrusb2 driver <[email protected]> > Sent: Monday, January 22, 2007 6:12:44 PM > Subject: Re: [pvrusb2] audio pops and cracks in the recordings > > > Anyway, I think you definitely need to run the device under Windows and > > test the audio there. > > ok, I have been watching the pbs channel for more than 45 minutes in windows > xp pro and I can't hear even a single pop so far. The channel has played much > more intense music compared to the clip I posted earlier. So, it doesn't look > like the device problem. I have tried various channels (CMT has lot of guitar > and no pops there) and no pops anywhere so far. Where do we go from here? > > I will stay in windows xp until I hear from you, if you want me to do some > troubleshooting in windows. And also to see if with time it heats up or > something and starts popping.....:) > > -devsk Sorry, on Mondays I've away from the net for pretty much the entire night. I don't have any obvious solutions here. So far you're still the only person to tell me of problems like this and I can't really seem to reproduce the problem here (but read on). Given that XP is OK, then the hardware has to be fine and we're left looking at the software. So what's difference? The pvrusb2 driver is clearly the same. The kernel version is different. I'm still running 2.6.18.1 here. I did test against 2.6.19-rc2 (I think) briefly a while back and don't remember encountering any kind of problem like this. I can try to update my kernel here and see if the problem happens. Is there anyone else here with devsk's setup and is or is not seeing this problem? The key to this problem is to figure out what is different. Now with that said, I *did* manage to do one thing here that seemed to produce a similar symptom. On a 29xxx device I had accidentally left the coax plugged into the TV F-connector while trying to listen to the radio. The result? I got the audio but it was full of cracks and pops, similar in pattern to what you got. But this was in radio mode on a 29xxx device, which is different than your situation. I tried the same experiment on a 24xxx device but the result was total static that time. Thinking further, I can see how a weak FM-modulated signal could do something like this - bursts of audio energy might displace the carrier faster than the tuner can track the weak signal and thus it pops. That might suggest something is misprogramming the tda9887 on your device causing the audio signal to be too weak. I think there have been cases like that on other (non-pvrusb2) hardware, but I'm not really sure. The best strategy here may be to compare environments and try to match them up. I will try out a 2.6.19.2 environment and see what happens. But it may be a few days yet before I can try that experiment. You might want to try kernel 2.6.18.1 and see if the cracking and popping still happens. I'm not hopeful that this is your problem, but we seem to be running out of options. You might also want to try building the latest v4l-dvb repository and installing that in your kernel. That will give you the absolute latest versions of all the support modules, so if the problem has been recently fixed then we don't have to keep chasing this. -Mike -- | Mike Isely | PGP fingerprint Spammers Die!! | | 03 54 43 4D 75 E5 CC 92 | isely @ pobox (dot) com | 71 16 01 E2 B5 F5 C1 E8 | | _______________________________________________ pvrusb2 mailing list [email protected] http://www.isely.net/cgi-bin/mailman/listinfo/pvrusb2 ____________________________________________________________________________________ It's here! Your new message! Get new email alerts with the free Yahoo! Toolbar. http://tools.search.yahoo.com/toolbar/features/mail/ _______________________________________________ pvrusb2 mailing list [email protected] http://www.isely.net/cgi-bin/mailman/listinfo/pvrusb2
