[linux-dvb] Freecom DVB-T USB stick freezes - problem solved

Matthew Linden matthew at linden.me.uk
Sat Jan 14 10:52:22 CET 2006


mike choy wrote:

> Matthew Linden wrote:
>
>> mike choy wrote:
>>
>>> Matthew
>>>
>>> if tzap is tuning that is pretty good, can you get a picture using 
>>> dvbstream
>>>
>>> =============from ethics gradient=====================================
>>>
>>> "Now look at your channels.conf file for the channel you tuned 
>>> above. For my setup on the Crystal Palace transmitter this line 
>>> looks like:
>>>
>>> BBC 
>>> ONE:505833330:INVERSION_OFF:BANDWIDTH_8_MHZ:FEC_3_4:FEC_NONE:QAM_16:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:600:601 
>>>
>>>
>>> The last two numbers are the IDs of the video and audio stream 
>>> within the multiplex. We also need the transmission parameters to 
>>> feed to dvbstream. The command I would use for the channel above is 
>>> this:
>>>
>>> *# dvbstream -o -ps -qam 16 -cr 3_4 600 601 | mplayer -*
>>>
>>> You'll need different options if you have DVB-S or DVB-C. See the 
>>> documentation for dvbstream.
>>>
>>> The result should be a perfect DVB picture of your chosen channel. 
>>> It should not stutter or break up and the audio should be clean. 
>>> It's just possible that occasional artefacts may appear but they 
>>> shouldn't be very noticeable. If the video breaks up, has major 
>>> colour problems, has a very low frame rate or is corrupt then there 
>>> is something wrong.
>>> ==================================================================
>>>
>> Mike,
>>
>> It freezes after a couple of minutes using dvbstream and mplayer in 
>> exactly the same way as with Kaffeine and xawtv4.
>>
>> I really do think the problem is with the USB power draw. A colleague 
>> was telling me this morning that boards for AMD CPUs are well known 
>> for having low power USB ports.
>>
>> Matthew
>>
>> _______________________________________________
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>> linux-dvb at linuxtv.org
>> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>>
> Might be worth trying an externally powered USB hub.
> eg I have some ports on my monitor which are powered by the monitor, 
> and these worked for my ipod
> compared to the ports on the mother board on one of my machines.
>
> Mike C

Problem solved - albeit with yet more ugly gubbins and cables.

The card works fine with no freezes when using an externally powered USB 
hub.

Thanks for the suggestion.

Matthew

>
>




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