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

mike choy mike at acaciaclose.co.uk
Sat Jan 14 13:01:22 CET 2006


Matthew Linden wrote:
> 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
>>>
>>> _______________________________________________
>>> linux-dvb mailing list
>>> 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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>
Excellent, now this begs the question, how does one find out if ones USB 
2.0 port is high powered or not, surely there is some sort of spec.

Mike C




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