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