[vdr] Re: DVB-T stream corruption in Finland

[Gregor Lawatscheck <gpel@mpex.net>]

At 12:53 23/01/2003, you wrote:
[...]
> I will keep it there for few days only. As the bandwidth is somewhat
> limited, please try this only if you are experiencing problems with missing
> frames or 'jumpy' picture. And if you do try, please report your success
> and/or problems.
First of all, Teemu, you're a star!

After having more or less given up on this problem, I actually 
coincidentally did some work on it this very morning, obviously without 
much success. When your email came through the list I was more than 
delighted to test it.

I also suspected the problem to be in the remuxer, but was barking up the 
wrong tree with the ts2pes / PTS stuff. You might say the fix is "quite 
simple" but it's certainly beyond me - I increased MMAX_PLENGTH in remux.c 
to *16 at one point, when trial & erroring whether it might be the 
packetsize - but that alone didn't resolve it. It looks like you've done 
some other nice magic, which I can't quite conceive at the moment just from 
looking at the patch because it adds other stuff as well and is in the form 
of ! rather than just + / - all the way.

You're definitely on the right track with this! It has fixed the Mux A 
(Channel 5) problem with DVB-T over here in the UK, so it looks like they 
are also sending oversized TS packets. Your patch is stable and without a 
glitch on vdr 1.1.21 with the 8.1.2003 CVS driver / firmware on that 
channel. I'm sure all other vdr DVB-T users in the UK will appreciate the 
patch!

I tried to backport your patch into vdr 1.1.13 which I like to use with the 
0.9.4 driver, however on that version, after about 2-3 minutes the picture 
freezes and vdr quits after 30 secs with "video data stream 
broken".  Pressing OK or changing channel before the timeout is another way 
of resolving it.

My problem general problem (not altered to your patch) with 1.1.21 and the 
CVS driver is, that some channels such as BBC2, BBC News 24 and some others 
run up the buffer to 100% but the card doesn't seem to "pick up" data from 
the buffer, so it results in a ring buffer overflow.  It's reproducably the 
same channels, whereas others work. Strange. It doesn't appear to be the 
firmware as I tried an 0.9.4 / 0.9.3 one with the same results. Is anyone 
else experiencing this with 1.1.21? 


--
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe vdr" as subject.