Hi,
Lots of good stuff in this thread! It seems Mauro has answered most
things, so I'm just going to respond to this bit.
On 09/07/2011 05:37 AM, Devin Heitmueller wrote:
<Snip>
We've added a parameter for that on xawtv3 (--alsa-latency). We've parametrized
it at the alsa stream function call. So, all it needs is to add a new parameter
at tvtime config file.
Ugh. We really need some sort of heuristic to do this. It's
unreasonable to expect users to know about some magic parameter buried
in a config file which causes it to start working. Perhaps a counter
that increments whenever an underrun is hit, and after a certain
number it automatically restarts the stream with a higher latency. Or
perhaps we're just making some poor choice in terms of the
buffers/periods for a given rate.
This may have something to do with usb versus pci capture, on my bttv card
30 ms works fine, but I can imagine it being a bit on the low side when
doing video + audio capture over USB. So maybe should default to say
50 for usb capture devices and 30 for pci capture devices?
In the end if people load there system enough / have a slow enough
system our default will always be wrong for them. All we can do is try to
get a default which is sane for most setups ...
Regards,
Hans
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