one small update. when i run the arecord | aplay combo with these parameters : arecord -D hw:1,0 -c 2 -f S16 --period-size=8192 --buffer-size=524288 | aplay - or with omitting the --period-size=8192 --buffer-size=524288 i hear noise. but when i start tvtime, right after video appears on screen i usually get 1-2 seconds of clear audio, and then noise comes in. i might be on to something. when i discard the buffering parameters sometimes arecord or aplay complain about buffer underrun. tvtime does not use cx88 mixes by default, by if i specify / also this command arecord -D hw:1,0 -c 2 -f S16_LE --period-size=65536 --buffer-size=524288 -r 48000| aplay -r 48000 - gives me very few errors now. noise pick ups when the sounds get louder though, but feel i'm really close now. this is on a freshly installed system with mpeg encoder module disabled. i'll do some more testing. On 7/1/08, marcin kowalski <yoshi314@xxxxxxxxx> wrote: > On 01:57 Tue 01 Jul , hermann pitton wrote: > > Hi, > > > > Am Montag, den 30.06.2008, 10:24 +0100 schrieb Simon Farnsworth: > > > yoshi watanabe wrote: > > > > hello. > > > > > > > > i'm using hauppauge hvr-1300 to receive video signal from playstation2 > > > > console, pal model. video is just fine, but i'm having strange audio > > > > issues, but judging by some searching i did - that's pretty common > > > > with this card , although people have varied experience with the card. > > > > > > > > > > I've had similar issues with SAA7134 based cards, which were resolved by > > > changing audio parameters. > > > > > > If your problem is the same as mine was, try: > > > arecord --format=S16 \ > > > --rate=32000 \ > > > --period-size=8192 \ > > > --buffer-size=524288 | aplay > > > > > > This forces 32kHz sampling, and gives the card lots of buffer space to > > > play with. > > > > 32kHz is true for saa713x TV audio dma sampling, saa7130 has no support > > at all for it. > > > > But 48Khz is default on cx88 stuff. > > > > Cheers, > > Hermann > > > > i guess that means i'm back to square one. it's pretty strange that noise gets more intense when > there is more movement in the video (more dynamic scenes = much more noise). but that doesn't mean that when there is > static screen displayed it works perfectly. it's more random than that. > > i wonder whether mpeg encoder might be interfering with the audio signal (audio in mpeg stream is always perfectly > clear). maybe i should try to disable it (by removing the firmware from /lib/firmware, or the module from the kernel) ? > > i guess i'll have to check around the branches, maybe somebody has some interesting patches that didn't make it into > main v4l-dvb tree yet. > > anyway, thanks for your help. > > _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
