On Thu, 01.10.09 12:38, Luca DELLA GHEZZA (luca_dgh at hotmail.it) wrote: > I can ear the tv audio from the standard output. That is fantastic, > because I tried as well with the BT headset and it works. > > Sadly the audio has a very poor quality: > 1) the audio is pulsing, it seems that it pump up and down the master > volume Uh? You say the volume changes all the time? That is weird. Maybe this is due to reception quality? Does this alos happen if you use this loopback stuff for your webcam mic? > 2) the rate is wrong, because it seems an old 33 rpm listening at > 45. Hmm, that is interesting. We actually resample the stream as necessary to deal with clock deviations between the sink and the source. On crappy devices where the timing interfcae is broken that might cause some weird effects. Now for the SAxxx TV drivers it is a fact that the driver is crappy. For example, it already chokes when we skip configuration of a hw buffers size/period size. Normally, the rate should stabilize after a while even on crappy devices. You might be able to improve behaviour by playing around with "adjust_time" (increase it to 30 or so...) > When I use sox to redirect audio it needs to set the rate to 32000, but > in this case has no effect. > I use s16le format because I know that the format used from the tv card > is Signed Little Endian 16 bit. > Finally I tried to change the latency to 1 and as well to 2000 but > nothing change, or very little changes. Yes, this is simply a hint. If the underlying devices cannot do this the actual measured latency might deviate substantially, both upwards and downwards. This is expected. > I need different settings or may be I need to change the sink > device? Normally, you shouldn't need any settings. Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net http://0pointer.net/lennart/ GnuPG 0x1A015CC4
