[linux-dvb] Re: DVB-T UK Frequencies

["Andy Coates" <andy@bribed.net>]

> > Actually I'm not sure I have - I verified it was actually 
> writing the
> > stream, but upon playback the mpeg is VERY jerky (imagine trying to
> > playback a dvd on an old pentium, it plays it but very 
> slowly as if it
> > can't decode fast enough). 
> 
> It's only playing maybe one frame in 5?

It plays them all, but not smoothly (like a few frames slow, then speeds
through then next lot - so it gives the impression of it being jerky).

I don't think this is a signal problem though, since I just put the mpeg
through my hollywood+ card and it played fine.  Before I was using
PowerDVD, and its had no problems with the other frequencies - just
these.

> This is almost certainly poor reception quality - I only have 
> access to a 
> small set-top aerial and have spent many happy hours making minute 
> adjustments to its positioning, and then sitting in 'just the 
> right place' to 
> get a smooth playback.
> 
> dvbtune is your friend here... 
> 
> $ dvbtune -f 537833 -qam 16 -cr 3_4 
> 
> to lock onto the signal 
> 
> then
> 
> $ dvbtune -f 537833 -qam 16 -cr 3_4 -m

Signal doesn't seem to be a problem here then:

Signal=9766, Verror=6351, SNR=51657dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=9766, Verror=6423, SNR=51400dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=9766, Verror=6160, SNR=51400dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=9766, Verror=6275, SNR=51914dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=9766, Verror=6178, SNR=51657dB, BlockErrors=0, (S|L|C|V|SY|)

So must be something different in the program stream for it to play back
different than the others.  I split the video into an ES stream and it
played back fine.  Wonder whats so different about this PS?

Andy.







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