[mythtv-users] ivtv says "application is not reading fast enough" (was 0.20 high cpu usage - suggestions?)

Victor Perez spectro at gmail.com
Tue Jan 23 15:57:39 UTC 2007

Hello all, since I upgraded to Knoppmyth R5E50 (mythtv 0.20) and I am
getting choppiness and framedrops in recordings around the time a
simultaneous recording starts/ends. There seems to be an issue in Mythtv
0.20 that hoses the CPU to the point it forces ivtv to flush its buffers:

ivtv1: All encoder MPEG stream buffers are full. Dropping data.
ivtv1: Cause: the application is not reading fast enough.

The IVTV guys fixed an issue with the driver that may be part of the cause.
It works better but still have issues with it.

On 1/11/07, rob+myth at robnet.com <rob+myth at robnet.com> wrote:
> On Wed, Jan 10, 2007 at 06:35:27AM -0600, rob+myth at robnet.com wrote:
> > Some 30 seconds or less after starting a recording the %cpu for
> mythbackend
> > climbs to 100% +/-, and I get the "dropping data" messages from ivtv
> (full
> > message below).  No message in mythbackend.log, but I need to run again
> with
> > more logging enabled.  Same happens for live tv.  The normal ivtv test,
> cat
> > /dev/video0 > test.mpg, works fine with low cpu (around 8%) and nothing
> in
> > dmesg even when run for more than an hour.  I keep thinking it's an ivtv
> > problem for some reason...  but this would seem to imply that it isn't.
> A quick follow up, in case others have similar problems.  After trying
> various
> combinations of kernel versions and ivtv versions, I'm back in
> business.  So
> even though the "cat test" worked, it *seems* it was a ivtv (or kernel)
> issue.
> The versions that I'm using now (and that seem to work fine):
> media-tv/ivtv-0.9.1
> sys-kernel/gentoo-sources-2.6.19-r3
> Both of those are masked.  Running a masked ivtv isn't new to me, but I
> usually avoid masked kernels.  Oh well... it's recording again!
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