[Bug 518478] [NEW] Long delays tuning DVB-T channels

[dardhal]

Public bug reported:

Binary package hint: vlc

Just upgraded from Ubuntu 9.04 to 9.10, and one of the things on "vlc"
that started to fail (somewhat) is DVB-T channels tuning. Tuning the
channels (configured in a previously defined, used for a long time, .m3u
file) works in the end, but takes a random amount of time to do so, from
10 seconds to more than 20 seconds.

Looking and the debugging output it seems like a problem loading the
demux module "ts", as you can seen in the following log fragment:

main debug: looking for demux module: 51 candidates
dvb debug: frontend has acquired signal
dvb debug: frontend has acquired carrier
dvb debug: frontend has acquired stable FEC
dvb debug: frontend has acquired sync
dvb debug: frontend has acquired lock
dvb debug: - Bit error rate: 0
dvb debug: - Signal strength: 59839
dvb debug: - SNR: 55769

[...long delay waiting for "vlc" to show anything on the screen...]

main debug: using demux module "ts"
main debug: TIMER module_need() : 20902,782 ms - Total 20902,782 ms / 1 intvls (Avg 20902,781 ms)


As I understand, "vlc" succeeds tuning the DVB card, but instead of inmediately decoding the stream, it takes it nearly 21 seconds loading the "ts" demux module and starting to decode the program. Trying other configured DVB-T channels show the same output, buf different "TIME module_need()" times, and the time it takes "vlc" to show the stream matched the delay shown in the logs.

Doesn't seem to be a configurable parameter to speed up this step, and
can't think of any problem that makes the "ts" demux module to take that
long. I have tried loading DVDs and MP3 files on "vlc" and switching
between files and medias, and only when tuning DVB-T channels I
experience the above problem.

Hope it helps.

ProblemType: Bug
Architecture: i386
Date: Sun Feb  7 19:03:57 2010
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: vlc 1.0.2-1ubuntu2.1
ProcEnviron:
 PATH=(custom, no user)
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-19.56-386
SourcePackage: vlc
Uname: Linux 2.6.31-19-386 i686

** Affects: vlc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386

-- 
Long delays tuning DVB-T channels
https://bugs.launchpad.net/bugs/518478
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