Re: Pb with sound on SECAM-L channels solved ! | |
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Hello to Paris!
Hello !
On Sun, Aug 01, 2004, hermann pitton wrote :
1. Why does this option "port2=0" solves my problem ?
http://www.spinics.net/lists/vfl/msg09857.html Seems that the decoding quality otherwise is such bad that the audiotrap of the chip doesn't lock. That is what I saw last, when after testing on Secam-L-Nicam without success you were moved to Pal-DK, but I also like to know what happened in detail. (philips.com has a datasheet ...;)
OK. This problem was not easy to solve, and I'm afraid other users will have the same problem. First, when I do a "modinfo tda9887", I don't see these options port1, port2, qss, etc... I had to look in the source code to discover them ! I think that the first step would be to make these options appear in "modinfo" with a small description. Second, as Eddy suggested, it would be better to add these hardware-specific tuner settings somewhere in the documentation.
Yes it should, but it is still in the state of global testing and work in progress. E.g. to add tda9887 options from tuner.h to the card config is brandnew and first used with the ati-tv-wonder cx88 Ntsc card. Also there are the microtune mt2050 tuners with tda9887 and they need (always?) a different config. And then things like Ntsc tuners of the same family, one works only with Intercarrier demodulation the other is happy with QSS. Mine with Pal-BG is fine with the default settings, but I have also quality sound with qss=0 port1=0 port2=0. It is a question of taste here, but for Secam-L QSS should be definitely the best choice ... And we simply don't have all configs yet, so noone can know what is the best shape in the end. (as said DScaler makes sense too, but they also have to find and verify the config for every single card and tv-norm first)
With Secam-L the europe multi tuner=38 gets color, think a report for Pal-I is missing, but a mt2050 in Denmark was already successfully disturbed by that audio-carrier :) Secam-DK seems still to need "options tda9887 secam=d".
2. Will it work with the option "port2=0" for the "tda9887" module on PAL channels with my KNC TV-Station DVR board ?
Try it,
But I don't have access to PAL TV signals, because I am in France !
Thought you might ask for someone else or you are sometimes near those signals.
An attempt to add port2=0 to Secam-L defaults was nonsense, but installing the card and only using v4lctl for settings shows PAL-BG A2 sound is still fine and also radio with port2=0. (we also have "auto mute fm = yes" now like DScaler) We can expect that switching between Pal dual-FM and Pal Nicam also works then.
OK, so I can be confident that it will also work with PAL TV signals with this option port2=0, right ?
That is what I can see for Pal-BG. Have my strange card also working stable again with xawtv overlay-preview. Would like to hear that switching between Secam-L, Pal-BG dual-FM and Pal-BG Nicam is working with a recent xawtv release.
p.s. hardware note: Found an EPCOS K3953D video- and a EPCOS K9456D audiofilter -46DB on tuner=38. My "tda9887" (B2 230) has 38 pins instead of 24. (next testing is yours ;)
I opened up the tuner of my KNC DVR board : my tda9887 also has 38 pins, and the tuner has the same filters as you (EPCOS K3953D and EPCOS K9456D).
Sometimes it is better to look into the black box. So no surprises, except that programming on an unknown chip is going on, backward compatible to tda9887 ...
Greetings, Hermann
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