the fallowing is the differnce between when the audio is good and bad
from $ v4l2-ctl --log-status
--- record.good 2008-05-07 20:51:09.250606270 -0300
+++ record.bad 2008-05-07 20:53:28.747993406 -0300
@@ -32,17 +32,16 @@
ivtv0: Stream: MPEG-2 Program Stream
ivtv0: VBI Format: No VBI
ivtv0: Video: 480x480, 30 fps
- ivtv0: Video: MPEG-2, 4x3, Variable Bitrate, 4000000, Peak 5000000
+ ivtv0: Video: MPEG-2, 4x3, Variable Bitrate, 4500000, Peak 6000000
ivtv0: Video: GOP Size 15, 2 B-Frames, GOP Closure
ivtv0: Audio: 48 kHz, Layer II, 384 kbps, Stereo, No Emphasis, No CRC
ivtv0: Spatial Filter: Manual, Luma 1D Horizontal, Chroma 1D
Horizontal, 0
ivtv0: Temporal Filter: Manual, 0
ivtv0: Median Filter: Off, Luma [0, 255], Chroma [0, 255]
ivtv0: Status flags: 0x00200000
- ivtv0: Stream encoder MPG: status 0x0118, 2% of 4096 KiB (128
buffers) in use
+ ivtv0: Stream encoder MPG: status 0x0118, 1% of 4096 KiB (128
buffers) in use
ivtv0: Stream encoder YUV: status 0x0000, 0% of 2048 KiB (64
buffers) in use
ivtv0: Stream encoder VBI: status 0x0000, 0% of 1040 KiB (61
buffers) in use
ivtv0: Stream encoder PCM: status 0x0000, 0% of 324 KiB (72
buffers) in use
- ivtv0: Read MPG/VBI: 1639094208/0 bytes
+ ivtv0: Read MPG/VBI: 52113408/0 bytes
ivtv0: ================== END STATUS CARD #0 ==================
it seems the video vbi and peek go up and the read mpg/vbi goes down,
which would match the issue cause the audio does sound simmiler to audio
recorded at mp2/3 at 32/64kbps rather then a higher rate like 384kbps.
perhaps this may be an issue with mythtv rather then ivtv? mythtv is
version 0.20.2_p14972
this is from audio line in(it is a mce with rca jacks) hooked up to
expressvu sat
Kevin
Andy Walls wrote:
> On Wed, 2008-05-07 at 19:06 -0300, Kevin Blair wrote:
>> Hi,
>>
>> im having the bad tinny audio issue on my mythtv system it has only
>> started recently, and is intermittent so some recordings are fine some
>> have bad audio, for live playback majortiy of the time audio is fine
>> only after going in and out and in and out of live tv sevral times did i
>> get the audio tinny, with no pattern its hard to predict or reproduce on
>> command, the source is svid and composite. cat /dev/video0 seems to test
>> out fine, how ever since live tv playback works most of the time i cant
>> say for sure that its working.
>>
>> i am useing gentoo linux and ivtv v1.0.3 i was useing 2.6.24 and i
>> upgraded to 2.6.25 kernel but the problem remains, due to hardware
>> compatibility i cant downgrade kernel. i tried adding tuner=50 to module
>> options with no success.
>> executing v4l2-ctl --set-audio-input 0 ; v4l2-ctl --set-audio-input 1
>> when i get mythtv audio playback bad the audio goes to normal, which
>> doesnt help fix the problem for recordings.
>
> What is the difference, if any, between the output of
>
> $ v4l2-ctl --log-status
>
> when the audio is good and when the audio is bad on the input same
> source.
>
> Also can you clarify: does this happens with tuner audio only, audio
> line in only, or both?
>
> -Andy
>
>> my tuner is as fallows from lspci -v
>> 05:06.0 Multimedia video controller: Internext Compression Inc iTVC16
>> (CX23416) MPEG-2 Encoder (rev 01)
>> Subsystem: Hauppauge computer works Inc. WinTV PVR 150
>> Flags: bus master, medium devsel, latency 64, IRQ 16
>> Memory at e4000000 (32-bit, prefetchable) [size=64M]
>> Capabilities: [44] Power Management version 2
>> Kernel driver in use: ivtv
>> Kernel modules: ivtv
>>
>> dmesg output from ivtv being loaded is as fallows:
>>
>> ivtv: Start initialization, version 1.2.0
>> ivtv0: Initializing card #0
>> ivtv0: Autodetected Hauppauge card (cx23416 based)
>> ACPI: PCI Interrupt Link [APC1] enabled at IRQ 16
>> ACPI: PCI Interrupt 0000:05:06.0[A] -> Link [APC1] -> GSI 16 (level,
>> low) -> IRQ 16
>> ivtv0: Unreasonably low latency timer, setting to 64 (was 32)
>> tveeprom 2-0050: Hauppauge model 26552, rev F068, serial# 10426282
>> tveeprom 2-0050: tuner model is LG TAPE H001F MK3 (idx 68, type 47)
>> tveeprom 2-0050: TV standards NTSC(M) (eeprom 0x08)
>> tveeprom 2-0050: audio processor is CX25843 (idx 37)
>> tveeprom 2-0050: decoder processor is CX25843 (idx 30)
>> tveeprom 2-0050: has radio, has no IR receiver, has no IR transmitter
>> ivtv0: Autodetected Hauppauge WinTV PVR-150
>> cx25840 2-0044: cx25843-24 found @ 0x88 (ivtv i2c driver #0)
>> tuner 2-0043: chip found @ 0x86 (ivtv i2c driver #0)
>> tda9887 2-0043: tda988[5/6/7] found
>> tuner 2-0061: chip found @ 0xc2 (ivtv i2c driver #0)
>> wm8775 2-001b: chip found @ 0x36 (ivtv i2c driver #0)
>> tuner-simple 2-0061: type set to 50 (TCL 2002N)
>> ivtv0: Registered device video0 for encoder MPG (4096 kB)
>> ivtv0: Registered device video32 for encoder YUV (2048 kB)
>> ivtv0: Registered device vbi0 for encoder VBI (1024 kB)
>> ivtv0: Registered device video24 for encoder PCM (320 kB)
>> ivtv0: Registered device radio0 for encoder radio
>> ivtv0: Initialized card #0: Hauppauge WinTV PVR-150
>> ivtv: End initialization
>>
>> and firmware
>> ivtv0: Loaded v4l-cx2341x-enc.fw firmware (376836 bytes)
>> ivtv0: Encoder revision: 0x02060039
>> cx25840 2-0044: loaded v4l-cx25840.fw firmware (16382 bytes)
>>
>>
>> any suggestions would be much appreciated.
>>
>> Kevin
>
>
>
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>
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