On Sat, 21 Oct 2006, Rob Grimm wrote: > Forgive me if this has been discussed. I could not find an answer in any of > the archives. > > When I watch captured TV from my PVR500 (either tuner. I'm not using the > composite/s-video inputs), I get a very slight audio distortion. It sounds > like a gain is set too high somewhere and some audio is clipping. I notice > it most during shows with higher frequency sounds, like female voices and > higher-pitched music. For some reason, the distortion is very noticable > during the shows survivor and lost. I first noticed this in MythTV, however > I also get it if I do a 'cat /dev/video0 > test.mpg'. I also still get the > distortion if I play back a recording using Myth, xine, and mplayer. I only > get it with TV. Music and DVDs sound perfect, so I'm assuming it's not an > ALSA problem. > > I have noticed this ever since I setup my myth box, about a year ago. I've > also tried fiddling with the volume controls in alsamixer and ivtvctl, or now > v4l-ctl I guess. > > Here are some specs that might help: > PVR-500mce, happens on both tuners. > Chaintech AV-710 (using digital out) > 2.6.18 kernel and 0.80 ivtv, although it happened with previous versions > Myth 0.20 > and all the latest other stuff as far as I'm aware of, including firmware. > > Anybody else experience this? Is this the "tinny audio" problem that people > talk about? I thought that was only when using the composite/s-video inputs, > which I'm not. Just analog cable-tv straight into the pvr500, no cable-box > or anything. I've also tried plugging the cable-tv line straight into the > TV, and the sound is normal. Most of the time I don't really notice it. It > only gets really annoying during certain shows. >
Sounds like the "tinny" audio symptoms, though I've never heard of it affecting purely tuner inputs. Have you tried to apply the patch referenced here: http://www.gossamer-threads.com/lists/ivtv/devel/32136#32136 If the patch helps, it would be interesting to know that this problem also may affect tuner inputs as well as those using sound line-in ... _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
