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.mp3 (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. Regs, Keehan. _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
