[ivtv-devel] The return of tinny audio in 0.4.2?

Moasat ivtv at moasat.dyndns.org
Fri Feb 10 03:11:59 CET 2006


> 
> 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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