Bug #2082
closed
Starting from scratch does not trigger an initial scan (blind-scan)
Added by Sascha Schmidt almost 11 years ago.
Updated over 10 years ago.
Found in version:
3.9.569~ge113c3b
Description
I've removed my complete TV-Headend configuration and started from scratch:
- Adding a network called "Astra 19.2E"
- Deactivate "Skip initial scan"
- No predefined muxes
- Configuration of my both dvb-adapters to 4-Port Switch
- Setting Port AB to Network "Astra 19.2E"
- Activate both adapters
In the past tv-headend began to tune and scan the networks. In the current git release TV-Headend does nothing at this time.
Bug?
I found the same a month ago. initial scan started after a restart of tvheadend.
A restart didn't start the initial scan... Tested it several times.
- Status changed from New to Rejected
Code has been replaced and I cannot repeat this with the new code, I'll assume its fixed (though code is not yet merged - there is a PR you can test though).
Adam
Today I restarted from scratcha again and was faced with the same problem. I've configured 2 Networks, and my 2 dvb devices. The 2 networks were attached to to 2 different ports on this devices AB and BA. AA and BB are free.
Tvheadend does not start initital scanning... No output, even in debug mode.
I had to add 1 mux manually for each network. Afterwards tvheadend started to fetch the rest.
I don't understand. If you don't add predefined muxes to a network (looking to the issue description), TVH does not know what to scan..
hm, ok. I thought that tvheadend will try to find a valid mux by itself.
If this is the way tvheadend should work, you can close this ticket.
Thanks!
Sascha
- Subject changed from Starting from scratch does not trigger an initial scan to Starting from scratch does not trigger an initial scan (blind-scan)
Sascha Schmidt wrote:
hm, ok. I thought that tvheadend will try to find a valid mux by itself.
If this is the way tvheadend should work, you can close this ticket.
This is called 'blind-scan', but it may take very long time to try all parameter combinations (especially for SAT).
We have good database (scantables) with predefined muxes from the linuxdvb project. Note that for Astra 19.2E - there is only one mux in the scan tables:
# Astra 19.2E SDT info service transponder
# freq pol sr fec
[CHANNEL]
DELIVERY_SYSTEM = DVBS
FREQUENCY = 12551500
POLARIZATION = VERTICAL
SYMBOL_RATE = 22000000
INNER_FEC = 5/6
INVERSION = AUTO
The blind-scan implementation may be really tricky.
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