FIXED: dibusb USB2.0 devices (garbled stream) Re: [linux-dvb] Problem with Avermedia AverTV DVB-T USB2.0 (a800)

Patrick Boettcher patrick.boettcher at
Sat Aug 27 19:11:47 CEST 2005

Hi Matt and others

While packing my stuff for moving out tomorrow (thank god I still have 
internet connection) I thought about the garbled-stream problem and I got 
an idea.
  For me it seems to work now. I switched channels 20 times now and there 
is no problem anymore. Please give latest CVS a try. Have a look at the 
CVS log if you are interested what the problem was.

Matt, thanks for making me think about this problem. :)

I also try to make them include it into the kernel before 2.6.13. I never 
submitted something for myself, so I cannot guarantee anything.

best regards,

   Mail: patrick.boettcher at

On Thu, 18 Aug 2005, Matt Holgate wrote:
> On Tue, 16 Aug 2005, Matt Holgate wrote:
>> On Tue, 16 Aug 2005, Patrick Boettcher wrote:
>>> No, unfortunately my suspicion was wrong. I added some debugging, but 
>>> didn't found the error yet. It seems to be a hard one.
> A few interesting things I've found. I don't know if these are red herrings 
> but:
> 1) when running tzap under high load, I never see the problem. For example, 
> if I do:
> perl -e 'while (1){}' in one console
> and then run tzap 'niced' in another console, I always seem to get a perfect 
> stream. So I'm wondering if it's a timing issue or something.
> 2) I'm not sure if this is obvious/expected behaviour (or if I understand it 
> properly), but whether or not the stream is corrupt or not seems to depend on 
> the *first* demux that has been setup.
> - If I do tzap then dvbstream | mplayer, then I quit mplayer and re-run it, 
> it will either fail every time or succeed every time.
> - If I do tzap -F (to prevent the demux setup in tzap), quitting and 
> restarting dvbstream/mplayer results in different results each time 
> (sometimes corrupt, sometimes fine).
> This makes me thing it has something to do with the first time a demux is 
> setup after setting up the frontend.
> I don't know if this is of any help, or if it is all coincidental effects...
> thanks,
> Matt.
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