I agree that there seems to be more than one variation of this audio problem and not sure if they are related.
I tried some more experiments and was able to generate a few variations of the bad audio (May account for why some people have different results). I will try to post some more mpegs to my site this weekend. I noticed that the cx25840 module is setting register 0x808 to 0xf6 which is a semi automated (standard = BTSC, mode = auto detect). I modified cx25840-core.c to try different values for this register: For 0x808 = 0xf6 (the default): soft reset can occasionally toggle the problem on and off. Since the mode is auto detected, I checked the detected mode in register 0x804. When audio is bad, it says 0x11 (Stereo+SAP). When audio is good, it says 0x01 (Stereo only). Also, the bad audio is generally much louder than the good audio. For 0x808 = 0x14 (force BTSC, mode=stereo): I tried this thinking that if the only problem is when SAP is active, then forcing it to stereo without SAP would fix it, but not true. I can still toggle problem on and off. However, when audio is the the "bad" state, it is much louder and noisier than when I used 0x808=0xf6. For 0x808 = 0x10 (force BTSC, mode=mono): I can still toggle bad audio on and off. But this is yet another variation of the bad audio. Now it sounds very quiet. It sounds like when you hook up speakers wrong and their phases cancel each other out. There are probably some other combinations I could try, but so far it seems like the audio standard/mode detection is not responsible for this problem, because no matter what I set, I still have the problem. I really don't know anything about BTSC other than what I'm reading in the cx25840 manual. It talks about combining the L+R and L-R signals. Maybe the problem is in how that happens. At one point it really did sound like L-R coming out. I'll get some more mpegs up this weekend. Jim --- John Biundo <[EMAIL PROTECTED]> wrote: > Moasat wrote: > > > Mine does not sound exactly like that. Yours > sounds like the actual volume > > changes a bit as well. My volume mostly stays the > same and I don't have any > > whine in the audio. But I think I can here the > same tinny sound behind the > > whine in your clip. Here are two of my samples: > > > > http://www.quicksfv.org/tinny1.avi > > http://www.quicksfv.org/tinny2.avi > > > > This definitely sounds like a different kind of > audio distortion than > what I'm getting. Mine is much more similar to > Jim's at > http://www.geocities.com/high_alive/ > > Seems like there may be two related problems here. > > It might be useful to get more samples and/or more > people who have what > they think is "tinny audio" to compare these clips. > > _______________________________________________ > ivtv-devel mailing list > [email protected] > http://ivtvdriver.org/mailman/listinfo/ivtv-devel > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
