Project

General

Profile

Bug #2082

Starting from scratch does not trigger an initial scan (blind-scan)

Added by Sascha Schmidt almost 9 years ago. Updated about 8 years ago.

Status:
Rejected
Priority:
Normal
Assignee:
-
Category:
DVB
Target version:
-
Start date:
2014-04-24
Due date:
% Done:

0%

Estimated time:
Found in version:
3.9.569~ge113c3b
Affected Versions:

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?

History

#1

Updated by Rob vh almost 9 years ago

I found the same a month ago. initial scan started after a restart of tvheadend.

#2

Updated by Sascha Schmidt almost 9 years ago

A restart didn't start the initial scan... Tested it several times.

#3

Updated by Adam Sutton over 8 years ago

  • 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

#4

Updated by Sascha Schmidt about 8 years ago

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.

#5

Updated by Sascha Schmidt about 8 years ago

I had to add 1 mux manually for each network. Afterwards tvheadend started to fetch the rest.

#6

Updated by Jaroslav Kysela about 8 years ago

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..

#7

Updated by Sascha Schmidt about 8 years ago

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

#8

Updated by Jaroslav Kysela about 8 years ago

  • 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.

Also available in: Atom PDF