> > Any feedback? > > Robert Kulagowski wrote: > > I'm getting tinny audio on 0.4.2 using a PVR-150 (NTSC), > composite inputs. > > > > As a quick guess, I'd say this happens 75% of the time. > Initial audio > > will be fine, but within 5-10 seconds, it will go "tinny", as if a > > buzz was being added to all audio. It will stay that way > through the > > rest of the program. > > > > I am able to reproduce this using a straight cat > /dev/video4 > foo.mpg > > and with MythTV. > > > > I know that in the past, tinny audio was related to > msp3400, but I'm > > not sure how the new integration effort with v4l / kernel may be > > affecting things. > > > > Anything I can do to assist in troubleshooting? > >
I think someone mentioned creating a cron job to call ivtvctl -q2 like every 15 seconds or so. I have the same problem and this worked for me. I'd say 75% is a good estimate of how often it happens to me but mostly, its when Myth starts to record something as opposed to LiveTV. In LiveTV, it only happens about 50%. Also, it happens almost instantly on changing channels, not the 5-10 seconds you seem to be experiencing. Having this cron job running, I can wait 15 seconds for the audio to "magically" clear itself up. I have not tried reverting the driver. I'm running 0.4.2 release on 2-6.14-gentoo-r2. Recommended firmware versions from the wiki. This also only seems to affect my PVR150. I have a PVR350 in the same box and it does not suffer from this. I tried swapping the PVR150 for another one but the results were the same. ivtv: ==================== START INIT IVTV ==================== ivtv: version 0.4.2 (tagged release) loading ivtv: Linux version: 2.6.14-gentoo-r2 SMP preempt PENTIUMIII gcc-3.3 ivtv: In case of problems please include the debug info between ivtv: the START INIT IVTV and END INIT IVTV lines, along with ivtv: any module options, when mailing the ivtv-users mailinglist. ivtv0: Autodetected WinTV PVR 150 card (cx23416 based) ACPI: PCI Interrupt 0000:00:08.0[A] -> GSI 18 (level, low) -> IRQ 17 ivtv0: Unreasonably low latency timer, setting to 64 (was 32) tveeprom: ivtv version tveeprom: Hauppauge: model = 26582, rev = C299, serial# = 8443615 tveeprom: tuner = TCL 2002N 5H (idx = 99, type = 50) tveeprom: tuner fmt = NTSC(M) (eeprom = 0x08, v4l2 = 0x00001000) tveeprom: audio processor = CX25843 (type = 25) tveeprom: decoder processor = CX25843 (type = 1e) ivtv0: i2c attach to card #0 ok [client=tveeprom, addr=50] tuner (ivtv): chip found at addr 0xc2 i2c-bus ivtv i2c driver #0 ivtv0: i2c attach to card #0 ok [client=(tuner unset), addr=61] cx25840 0-0044: ivtv driver cx25840 0-0044: cx25843-23 found @ 0x88 (ivtv i2c driver #0) cx25840 0-0044: loaded v4l-cx25840.fw firmware (14264 bytes) ivtv0: i2c attach to card #0 ok [client=cx25840, addr=44] wm8775 0-001b: ivtv driver wm8775 0-001b: chip found @ 0x36 (ivtv i2c driver #0) ivtv0: i2c attach to card #0 ok [client=wm8775, addr=1b] ivtv0: loaded v4l-cx2341x-enc.fw firmware (262144 bytes) ivtv0: Encoder revision: 0x02050032 ivtv0: Allocate DMA encoder MPEG stream: 128 x 32768 buffers (4096KB total) ivtv0: Allocate DMA encoder YUV stream: 194 x 10800 buffers (2048KB total) ivtv0: Allocate DMA encoder VBI stream: 120 x 17472 buffers (2048KB total) ivtv0: Allocate DMA encoder PCM audio stream: 455 x 4608 buffers (2048KB total) tuner: type set to 50 (TCL 2002N) by ivtv i2c driver #0 ivtv0: Initialized WinTV PVR 150, card #0 ivtv: ====================== NEXT CARD ====================== ivtv1: Autodetected WinTV PVR 350 card (cx23415 based) ACPI: PCI Interrupt 0000:00:0a.0[A] -> GSI 16 (level, low) -> IRQ 18 ivtv1: Unreasonably low latency timer, setting to 64 (was 32) tveeprom: ivtv version tveeprom: Hauppauge: model = 48132, rev = J323, serial# = 7205934 tveeprom: tuner = Philips FM1236 (idx = 23, type = 2) tveeprom: tuner fmt = NTSC(M) (eeprom = 0x08, v4l2 = 0x00001000) tveeprom: audio processor = MSP4448 (type = 1b) tveeprom: decoder processor = SAA7115 (type = 13) ivtv1: i2c attach to card #1 ok [client=tveeprom, addr=50] tuner (ivtv): chip found at addr 0xc2 i2c-bus ivtv i2c driver #1 ivtv1: i2c attach to card #1 ok [client=(tuner unset), addr=61] saa7115 1-0021: ivtv driver saa7115 1-0021: saa7115 found @ 0x42 (ivtv i2c driver #1) ivtv1: i2c attach to card #1 ok [client=saa7115, addr=21] saa7127 1-0044: ivtv driver saa7127 1-0044: saa7127 found @ 0x88 (ivtv i2c driver #1) ivtv1: i2c attach to card #1 ok [client=saa7127, addr=44] msp3400 1-0040: ivtv driver msp3400 1-0040: chip=MSP4448G-A2 +nicam +simple +simpler +radio mode=simpler msp3400 1-0040: msp34xxg daemon started ivtv1: i2c attach to card #1 ok [client=MSP4448G-A2, addr=40] ivtv1: loaded v4l-cx2341x-enc.fw firmware (262144 bytes) ivtv1: loaded v4l-cx2341x-dec.fw firmware (262144 bytes) ivtv1: Encoder revision: 0x02050032 ivtv1: Decoder revision: 0x02020023 ivtv1: Allocate DMA encoder MPEG stream: 128 x 32768 buffers (4096KB total) ivtv1: Allocate DMA encoder YUV stream: 194 x 10800 buffers (2048KB total) ivtv1: Allocate DMA encoder VBI stream: 120 x 17472 buffers (2048KB total) ivtv1: Allocate DMA encoder PCM audio stream: 455 x 4608 buffers (2048KB total) ivtv1: Create encoder radio stream ivtv1: Allocate DMA decoder MPEG stream: 16 x 65536 buffers (1024KB total) ivtv1: Allocate DMA decoder VBI stream: 512 x 2048 buffers (1024KB total) ivtv1: Create decoder VOUT stream ivtv1: Allocate DMA decoder YUV stream: 24 x 43200 buffers (1024KB total) ivtv1: loaded v4l-cx2341x-init.mpg firmware (155648 bytes) tuner: type set to 2 (Philips NTSC (FI1236,FM1236 and compatibles)) by ivtv i2c driver #1 ivtv1: Initialized WinTV PVR 350, card #1 ivtv: ==================== END INIT IVTV ====================
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