Oliver Schinagl <oliver@xxxxxxxxxxx> wrote: >On 03/06/13 18:36, Jean Delvare wrote: >> Hi all, >> >> I have a TerraTec Cinergy T PCIe Dual card, with DRX-3916K and >> DRX-3913K frontends. I am thus using the drxk dvb-frontend driver. >> While trying to find the best antenna, position and amplification, I >> found that the statistics returned by the drxk driver look quite bad: >> >> $ femon -H 3 >> FE: DRXK DVB-T (DVBT) >> status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | >FE_HAS_LOCK >> status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | >FE_HAS_LOCK >> status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | >FE_HAS_LOCK >> >> This is with TV looking reasonably good, so these figures are not >> plausible. >> >> $ femon 10 >> FE: DRXK DVB-T (DVBT) >> status SCVYL | signal 00de | snr 00f5 | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 00f0 | snr 00f5 | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 0117 | snr 00f6 | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 00b6 | snr 00eb | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 00d1 | snr 00e7 | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 0073 | snr 00ea | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 00a3 | snr 00ee | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 00b5 | snr 00f4 | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 00ba | snr 00f3 | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> status SCVYL | signal 00be | snr 00f0 | ber 00000000 | unc 000097a6 | >FE_HAS_LOCK >> >> Signal values are changing too much, snr is stable enough but way too >> low, ber is apparently unimplemented, and unc is never reset AFAICS >(it >> started at 1 when the system started and has been only increasing >since >> then.) On my previous card, unc was an instant measurement, not a >> cumulative value, not sure which is correct. >Yes I found that out aswell, but since image quality has always been >very fine, I haven't looked what this all should be. >> >> I would like to see these statistics improved. I am willing to help, >> however the drxk driver is rather complex (at least to my eyes) and I >> do not have a datasheet so I wouldn't know where to start. Is there >> anyone who can work on this and/or provide some guidance? >> >> Thanks, >> > >-- >To unsubscribe from this list: send the line "unsubscribe linux-media" >in >the body of a message to majordomo@xxxxxxxxxxxxxxx >More majordomo info at http://vger.kernel.org/majordomo-info.html Unc should be a cumulative value and not reset after each read. Then you can support a use case of 2 different apps monitoring the statistics. I can't recall when exactly unc should be reset, but of frequency change sounds reasonable. Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
