[linux-dvb] Re: TT USB Budget cc discontinuity / lost sync.

[Johannes Stezenbach <js@linuxtv.org>]

Peter Weissgerber wrote:
>  --- Peter Weissgerber <peterw2k@yahoo.de> schrieb: 
> > [TT USB Budget-artifacts and the following error
> msg]
> > ttusb_process_muxpack: muxpack with incorrect
> > checksum, ignoring
> > ttusb_process_frame: lost sync.
> > ttusb_process_muxpack: cc discontinuity (2 frames
> > missing)
> 
> The problem seems to occur only with channels that
> send with a high bit rate (> about 5 MBit/s). For
> example EuroNews (from ZDF transponder) works
> flowlessly; RTL, Kabel1 work most of the time but have
> occasional artifacts; ZDF, WDR (from WDR transponder)
> work never (only artifacts). 
> 
> Seems that the transmission over USB is too lame. Can
> this be a hardware issue or a driver issue. How can I
> tune-up it so that it works (it should work,
> shouldn't?)? My board is an VIA EPIA V5000 with USB
> 1.1 onboard (uhci_hcd). USB is on IRQ 5. This IRQ is
> only used by USB.

I know nothing about the TT USB Budget. Anyway:
Did you try to raise ISO_BUF_COUNT? I don't know
how to detect missed iso usb packets, but I guess
that is what happens.

Johannes