On Sunday 27 August 2006 05:31, Keehan Dowd wrote:
> Keehan Dowd wrote:
> > Hello All,
> > After about 20 hours of testing, I had the DMA error occur with the
> > following in /var/log/messages:
> >
> > Aug 26 12:47:14 localhost kernel: [91730.749087] ivtv0 warning:
> > ENC: (0) DMA Error 0x0000000b 00020001
> > Aug 26 12:47:14 localhost kernel: [91730.750073] ivtv0 warning:
> > offset 0 -> 128
> > Aug 26 12:47:14 localhost kernel: [91730.754678] ivtv0 warning:
> > offset 128 -> 0
> >
> > I was running MythTV with two PVR150 encoders simultaneously and it
> > was also running two commflag jobs and three transcode jobs at the
> > same time when the DMA error occurred..
> >
> > Things are looking good though as there was no visible glitch in
> > the mpg video when or later after the DMA error occurred and
> > subsequent recordings look good too.
> >
> > Thanks and Regards to All,
> > Keehan.
>
> After some more testing since implementing the DMA Error patch, I've
> come across an interesting situation...
>
> Often, I stream MythTV recordings (using VLC and MythStreamTV) to
> another computer for remote viewing. I found that if I stream an mpg
> recording since implementing the DMA Error patch, there are some
> "popping" noises heard in the audio and after a few seconds the audio
> slows down. You can hear a sample of the audio slowing down here:
> http://www.ozcanuck.com/ivtv-samples/sample1.mp3 (723KB)
> The raw mpg file from MythTV that produced this effect can be sampled
> here: http://www.ozcanuck.com/ivtv-samples/sample1.mpg (lookout! -
> 36.8 MB) I realise that this is probably VLC that is causing this
> effect, however before implementing the DMA Error patch it was
> behaving normally. I've also noticed that the audio on the original
> mpg file now contains "popping" or "clicking" noises, mostly in the
> right channel since implementing the patch. The following sample of
> the 6PM News contains mostly spoken word content and the "popping" is
> quite noticeable:
> http://www.ozcanuck.com/ivtv-samples/6pm_News_1_with_VLC_transcoder.m
>p3 (1.30MB)
>
> If you have trouble downloading the samples above from the links in
> this email, you can find them all here:
> http://www.ozcanuck.com/ivtv-samples/
>
> Under Windows, WinAmp and VLC seem to have trouble playing the
> original MPG file. The video playback is choppy, but under Linux,
> Mplayer and VLC don't seem to have any problems playing the content,
> however the popping noises are still heard.
>
> If MythTV transcodes the file from mpg to nuv (DIV3), and I then
> stream the transcoded file, everything behaves normally.
>
> I'm using IVTV 0.4.6 with MythTV 0.19 on Ubuntu Breezy, Kernel
> 2.6.12-10-386.
>
> Just some strange behaviour and if I transcode the mpg recording,
> everything is fine. I just though I'd mention it to the list.
Do the 'popping' noises correspond to messages in the kernel log?
Hans
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