Tvheadend

New versions of TVH use PID HW filter automatically. You should see limited bandwidth in the status tab when you open one service.

As adviced here https://tvheadend.org/boards/5/topics/22897?r=23232 I comment as I may have the same problem (if it is really the same).

I'm using a Sundtek MediaTV Pro III ([[http://sundtek.com/shop/Digital-TV-Sticks-oxid/Sundtek-MediaTV-Pro-DVB-C/T/T2-FM-Radio-AnalogTV.html]]) with TVheadend (master) on a Raspberry Pi 3. The device has 15 HW PID filters in total but, it seems that TVheadend uses all of them, when I tune to one channel (DVB-C). When all 15 HW PID filters are used and still another one is requested the Sundtek driver disables hardware PID filtering. With HW PID filtering I experience way better streaming quality without stuttering and stalls. Is it somehow possible to limit the amount of usable PID filters in TVheadend? If not, could that be implemented? VDR ([[http://www.tvdr.de/]]) for example allocates fewer PIDs and HW PID filtering is not disabled. Following [[http://forum.dvblogic.com/viewtopic.php?f=97&t=26731&p=85878&sid=7dac5783dfba92c0ab7703062d15c7b2]] DVBServer seems to act the same as TVheadend as opposed to VDR.

If you need further information, please ask.

You can override "Maximum PIDs" in the tuner settings (advanced level). The default value is 32. So, it appears like not a bug.

Thank you for that hint. I set the maximum PIDs to 15 but, the driver still switches to SW PID filtering as more than 15 HW PID filters have been requested. The same happens with Maximum PIDs set to 14.
Any idea?

Could you try to change line in src/input/mpegts/linuxdvb/linuxdvb_frontend.c - "int i, max = MAX\(16, lfe->lfe_pids_max\);" - decrease the 16 to 14. Appearently, I didn't expect less than 16 PIDs..

I changed the file accordingly and recompiled TVHeadend from trunk but, still the same.

Provide '--trace mpegts,linuxdvb'. https://tvheadend.org/projects/tvheadend/wiki/Traces

@Jaroslav Kysela
Did you have a chance to look into the traces and the issue? Do you need anything else?

Try to disable all unused EIT grabbers (opentv, Bullsat - etc.). Each grabber uses one or more PID.

I disabled all unused EIT grabbers and since then the driver doesn't revert to software PIDs anymore. So the combination of that with your patch mentioned in https://tvheadend.org/issues/4050#note-5 works. But what now? Do you have any idea how the respective code could be changed in a way, that the # of maximum PIDs as set in the configuration UI is respected, so the hardcoded limit of 16 could be removed entirely?