[ivtv-users] cx18: NVP: prebuffering pause error on HVR-1600 S-video

[igloocentral hotmail]

I couldn't write to that debug file, no matter what. I hope these commands are equivalent:

sudo service mythtv-backend stop
sudo modprobe -r cx18
sudo modprobe cx18 debug=15
v4l2-ctl -i 1
mplayer /dev/video0 -cache 16384
mplayer /dev/video0

> How rapidly does the A-V difference grow with unbuffered playback? With buffered playback, how rapidly does the cache fill sink to 0%?

Unbuffered: A-V reaches 10 in as fast as 30 seconds:

Too many video packets in the buffer: (4096 in 7965612 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.
Cannot sync MAD frame
A:  45.2 V:  35.0 A-V: 10.198 ct:  1.519 1026/1026  3%  0% 91.9% 266 0 

Buffered: cache reaches 0 in 2 min 30 sec:

Too many video packets in the buffer: (4096 in 7959616 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.
Cannot sync MAD frame
A: 292.7 V: 282.5 A-V: 10.188 ct: 12.419 8460/8460  3%  0% 24.8% 176 0 0% 

> With those debug settings I mentioned above, how often in the log to you get the  "Possibly falling behind" messages and messages about putting buffers back into rotation?

I see only two "Possibly falling behind" messages and none about putting buffers back into rotation. I have attached the dmesg log.

> I would think that sharing an interrupt with the nvidia hardware/driver is not what you want to do.  Maybe changing to a slot that doesn't use that PCI IRQ line would help.  Note slots 4 and slot 5 in a chassis may not rotate the interrupt line traces on the motherboard, so changing between those slots won't help.

I moved the card to 18, but don't see any effect on the video.

me at you:~$ grep cx18 /proc/interrupts
 18:       4608       4582   IO-APIC-fasteoi   uhci_hcd:usb3, ehci_hcd:usb4, uhci_hcd:usb7, cx18-0

What I find strange is how things work fine from the tuner card but not s-video. I mean, its basically the same video stream. Different code I guess? If the quality wasn't so poor on the tuner card, that would be my solution! Thanks again.
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