While even RPi3B+ showed some continuity errors, there were less of them, and they were not visible in the video (and I suspect they were mostly related to "channel switching"). For a comparison I have been running a same tuner (WinTV-dualHD) on the same source (both tuners connected through a passive Y-splitter) connected to RPi3B+. It seemed to be a bit better on USB2 ports, though the errors were detected on both (USB3 and USB2) ports, not only in TVHeadend log, but also visible in the image as an intermittent pixelation and stuttering. While working with DVB-T2 channels I registered a significant number of "Continuity errors". Just for the record, as I have been wrapping my head around it for the past few days when I was trying TVHeadend on Raspbian (Buster) on RPi4 (with WinTV-dualHD DVB-T dual tuner). of which is the better mode to run in under Linux when both tuners are in use? I've tried the windows tool and it does allow me to switch my Dual HD from Isochronous to Bulk and dmesg confirms the tuner is in Bulk rather than Isochronous mode.ĭoes anyone have any views, experience etc. After changing the mode to "bulk" using this tool, please check the dmesg messages again and verify that it now states "dvb set to bulk mode". The only way to change it is to use a free windows tool provided by the manufacturer Hauppauge: Please install the windows driver for the stick first, because they need to be installed before running the tool. Currently there is no known way to change that mode using a linux command or passing options to the kernel module. When the stick is detected there is a line that reads "dvb set to isoc mode" when in isochronous mode, when bulk mode is active, an analogous message is shown. You can check the mode your stick is using with dmesg. This problem has been confirmed by many users of the VDR (German language, ), but is very likely to occurr with other software as well. when a EPG scan is running in the background). This often leads to artifacts being shown in the video stream when both tuners are active (e.g. The stick supports two transfer modes: isochronous and bulk, whereas most revisions use the isochronous mode by default. There is some discussion here : Setting Transfer Mode to bulk However I recently discovered that you can run the tuner in one of two modes, Isochronous or Bulk. I've got a pair of Hauppauge Win TV Dual HD USB DVB-C/T/T2 tuners, and with a modern kernel and the right firmware on a Raspberry Pi 3B+ or 4B they work OK.
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