My last install of R5A26 worked fined.

I upgraded to R5B7 and now R5C7 and have a problem where it can't find all the TV stations. Typically BBC1/2, maybe Sky3, Cbeebies/CBBC and the news channels.

I did a temporary install of Ubuntu on the box and this found all the stations first time.

I also have an old freeview box plugged into the same distro amp/aerial and this sees all the channels fine too.

I'm now at a bit loss as what to do. Has anything happened to the DVB-T drivers recently?

Lee
MythTv box - Sempron 2500, 512GB ram, Abit NF7 mobo, Samsung 250GB drive, 3 x Avermedia 771 DVB-T cards, generic Geforce 400MX video, MCE remote.

I had a similar problem, i sorted it by looking up the frequencies for my area and scanning them one by one rather than doing a full scan.

Ok. I've reinstalled R5C7 and manually added all the DVB-T muxes. Scanning for channels still doesn't find all of them.

I've extracted the channels table from the old DB backup and loaded that into the new MySQL database. So all the channels appear correctly. However, it still won't tune into them.

I'd suspect the hardware, but it works fine under Ubuntu. Looking at the change logs there has been DVB-T work between A26 and C7. Does anyone know if any drivers/etc have been changed?

Lee

My advice is stick with Ubuntu since it works right now.

It appears to me that the Myth developers are doing a lot of patch work with DVB.

Quite a bit changed from Myth 18 to Myth 19 and I hope the same will happen between 19 and 20.

As more people move to HD it's becoming more mature....

I haven't notied any problem with keeping TV tuning when upgrading Myth to R5C7 from R5B7. I have to say I don't watch CBBC but hey... Did you do the pre-upgrade backup suggested by tjc?

I have R5B7 and I have no problems with getting access to most of the DVB-T channels, actually it seems much better quality, then previous releases.

I say most of the channels, as I have an old aerial and I cannot seem to pickup MUX 2 (ITV), MUX A (five, etc.), MUX B (BBC). This is due to them being at a different signal level(or height) to the other muxes. Even my freeview box, in the bedroom seems to struggle with MUX A and MUX B.

Luckily, my aerial seems to pick up MUX2(ITV) from a different transmitter.

I did notice, however, that I had to do multiple channel scans to get a fuller list of channels.

BTW, I also connect my DVB-T tuner to a aerial amplifier connected to, and powered by, my Sky box's RF2 port

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Currently Installed: Asus Pundit, 1.7GHz Celeron, 512MB memory, AVermedia DVB-T (A761), AVermedia AVerTV Hybrid+FM PCI (A16AR).

In R5B7 I found that i had similar problems with Channel 5 (and others) but found them doing multiple scan's.

However, with C5 - their is intermittant interference that i cannot remember having previously.

In response to Tophee, yes it did do a backup (well kinda) - I installed a new drive and installed R5B7/R5C7 on that, after the latest replies I tried mutiple scans, and yes it does find more channels, but equally it won't always tune into them...

I swapped the drives back around and I'm booting back into R5A26 again, and it works just fine on all the channels (I've surfed and they all work fine)...

This leads to the only conclusion - something is definitely got broken between B26 and B7/C7... repeated installs (KM and Ubuntu), dozens of scans, manually imported channel lists, different amps/etc...
It's not the hardware - the software is adrift somewhere...

I'd guess it's just a minor DVB driver issue, as it's the tuning that's broken, rather than Myth itself, but as I'm a noob I'm lost...

I'd read about dodgy firmware, and on Windoze I'd revert back to an older driver, but in LinuxLand I'm pretty stuffed...

Cesman, Devs, were the DVB-T drivers updated?

leev,

If you want to try the latest drivers, then if you look at my post here.

It explains, in what I hope are simple terms, how to install the latest DVB drivers from the current source.

I have been using Linux and DVB for a few years now and never really had a problem with the latest source.

Hope this helps.

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Currently Installed: Asus Pundit, 1.7GHz Celeron, 512MB memory, AVermedia DVB-T (A761), AVermedia AVerTV Hybrid+FM PCI (A16AR).

moatz,

I'll try anything once...

A quick question, in step d. looking in

http://linuxtv.org/hg/v4l-dvb?mf=3a0afd ... yle=gitweb

I see no zip files.... what am I missing here?

If you have a look at the top menu (summary/Changelog/......), you will see the links in the menu. The links from this page are:

gz, and bz2.

Choose your favoured packaging format and download the source.

Unpack the gz file with tar -xzvf, or unpack the bz2 file with tar -xjvf.

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Currently Installed: Asus Pundit, 1.7GHz Celeron, 512MB memory, AVermedia DVB-T (A761), AVermedia AVerTV Hybrid+FM PCI (A16AR).

Sorry I didn't reply Leev to your responce. I hadn't checked on this thread for a while.

As for your commments on the software beig borked. I think that's pretty much the size of it.

As my current build is an upgrade of an upgrade (I think I started with R5A26 and been moving up with KnoppMyth on each release) the channels have all been fine.

My hardware:
Sempron 2600
512 DDR 333
Abit NF6-S Nforce2 mobo
Samsung Spinpoint 250Gghdd
Nova-T x2
Asonic soundcard with optical out

I'm under the impression the Nova-T's are one of the better supported dvb cards around.

I think your right on the firmware issue - it's certaily come up in the tickets over at MythTV and others have reported problems, but it seems to affect those with fresh builds of Myth.

Darn, I was looking for a link to a thread that mentioned this and can't put my finger on it atm.

As I am about to build a system for the inlaws, I think I'm going to be going with a R5A30.2 then upgrading to a R5C7 build to ensure DVB works.