Hi,
Chun Chung Lo wrote:
Hi,
Thanks for your quick reply.
But do you know any other factors that will cause the corruption of
captured TS ?
I have checked no interrupt lost during I capturing TS.
Thanks for your help.
Best regards,
Lo Chun Chung
-----Original Message-----
From: linux-dvb-bounces@xxxxxxxxxxx
[mailto:linux-dvb-bounces@xxxxxxxxxxx] On Behalf Of Georg Acher
Sent: Wednesday, 20 September, 2006 10:03 AM
To: linux-dvb@xxxxxxxxxxx
Subject: Re: Tzap utilities questions - status of TDA10046
On Wed, Sep 20, 2006 at 09:51:42AM +0800, Chun Chung Lo wrote:
Hi,
So you mean that the "ber" occurence will not related to the captured
TS quality ?
Not with this low ber value. If it increases (>0x5000-0xa000 in my
experience), you will get errors in the TS.
I would like to clarify my question, which is as the status screen
dump is shown below, the captured TS quality is so bad, some flahsing
squares will appear on some frames randomly at some instance (just
seems the captured TS packets are corruppted and missing).
If the reception is that bad, you should have at least unc != 0 a few
times.
--
Georg Acher, acher@xxxxxxxxx
http://www.lrr.in.tum.de/~acher
"Oh no, not again !" The bowl of petunias
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As Georg already mentioned, the value for ber is before error correction.
Your tzap log indicates an almost perfect signal.
I am not sure what you mean with bad TS quality, is the stream corrupted?
4MBit is not much for critical patterns.
But if you see a corrupted Stream, either your generator does something
wrong (packet formatting), or - more likely - you have a problem with
the TS - DMA.
If your work is based on Gerd Knorrs driver, you need to be aware that it
has a bug in the TS DMA. I fixed this in the v4l-dvb repository about a
year ago. This can easily be the cause for your problem. You also need
to know that the SAA713x can not handle TS streaming and analog video
in a planar format parallel. If you try to do so, both streams will be
corrupted since they go over the same DMA engine.
Hartmut
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