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 > > > > _______________________________________________ > ivtv-users mailing list > ivtv-users@ivtvdriver.org > http://ivtvdriver.org/mailman/listinfo/ivtv-users > _______________________________________________ ivtv-users mailing list ivtv-users@ivtvdriver.org http://ivtvdriver.org/mailman/listinfo/ivtv-users