<br><br><div class="gmail_quote">On Wed, Nov 19, 2008 at 7:35 AM, Andy Walls <span dir="ltr"><<a href="mailto:awalls@radix.net">awalls@radix.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">On Wed, 2008-11-19 at 01:45 -0500, Al McIntosh wrote:<br>
> I am recording from the SVIDEO input.<br>
><br>
> On Wed, Nov 19, 2008 at 1:41 AM, Al McIntosh <<a href="mailto:al@allanmcintosh.com">al@allanmcintosh.com</a>><br>
> wrote:<br>
> I have been testing the HVR 1600 mostly using mythtv,<br>
><br>
> 1 recording had hyperfast audio playback and I am also<br>
> noticing intermittent skips in audio, silence for about a 1<br>
> second.<br>
><br>
> Is this currently common behaviour?<br>
<br>
</div>This is a known problem with the first analog (e.g. SVIDEO) capture<br>
after modprobe. All subsequent captures after that one should be fine.<br>
<br>
I have an idea on how I might fix it. It's on my todo list. Since it<br>
has a simple workaround, it's pretty low on the list.<br>
<div class="Ih2E3d"><br>
<br>
<br>
> I noticed this in my dmesg :<br>
><br>
> [ 3087.476431] cx18-0: Cannot find buffer 33 for stream<br>
> encoder MPEG<br>
> [ 3087.476442] cx18-0: Could not find buf 33 for stream<br>
> encoder MPEG<br>
<br>
<br>
</div>This is the first message in a downward spiral of dropping buffers out<br>
of the driver <-> firmware buffer transfer rotation. If enough of those<br>
happen during a capture, the capture will stall. It is caused by a long<br>
interrupt response latency in your system (with the driver contributing<br>
to that latency). and the driver not checking for the firmware to driver<br>
mailbox being stale and possibly overwritten by the firmware.<br>
<br>
My latest changes in my experimental repo addresses precisely this<br>
problem. See my recent announcement on the lists.<br>
<br>
<br>
Regards,<br>
Andy<br>
<br>
</blockquote></div><br><br><br>Andy, I'll install and test your dev bundle tonight after work. <br><br>