>On Jan 2, 2008 12:14 PM, Roger James <roger <at> beardandsandals.co.uk> wrote: >> I have been struggling for a couple of days trying to get decent NIT dumps >> off a local multiplex. Using tzap to tune a channel, exiting tzap and then >> running dvbsnoop, it seemed very variable whether I found the table before >> timing out. I noticed I had more success I kept retuning the frontend using >> tzap before each dvbsnoop run. But even then it would quite often produce >> nothing. I knew the driver and rf side setup was good because mtyhtv was using >> all the devices and multiplexes successfully. On checking the kernel logs I >> found I was getting a lot of cx8802_timeout messages on unsuccessful runs. So >> I tried a test running tzap, waiting till the frontend had lock, then exiting >> tzap and running femon. As I suspected, after a few seconds femon reported >> that the frontend had lost lock. So I a tried the dvbsnoop test with tzap left >> running in another session. Result, everything worked perfectly. > >Exactly as expected. > >> I am running debian stable with a 2.5.19.2 kernel. >> >> Is this expected behaviour? Can anyone explain to me what is happening? > >Yes. The moment tzap is stopped, tuning ceases. Also, if you don't >specify -r to tzap, you'll get nothing from the dvr device. > >> In the past I had always assumed that could exit tzap after you had tuned a >> channel and the fe would stay locked as long as signal remained good. > >Nope. > >Always keep tzap running when performing this type of testing. > >Also, you sent this email to the video4linux mailing list, which only >deals with analog video. cc added to linux-dvb, which is more >appropriate for this topic. > >I hope this helps. > >Regards, > >Mike Mike Sorry about the intial post to the wrong list. Tnanks for the heads up. The doumentation I have read does not make the fact that you have to leave tzap running clear. It does seem a bit counterintuitive for an app that is named afer a zapper/remote, you don't expect to keep having to point your zapper at the TV to keep the channel tuned :-). Can anyone point me at somewhere were this is documented/explained. Is there some active element in the frontend tuning process that is disabled once tzap exits and closes its interfaces to the dvb driver? Thanks, Roger _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
