Bug 401216

Summary:	Freeze after switching TV channels
Product:	[Applications] kaffeine	Reporter:	i-bugs-kde-org-ushfas
Component:	general	Assignee:	Mauro Carvalho Chehab <mchehab>
Status:	REPORTED ---
Severity:	normal	CC:	tbsgmbhandroid
Priority:	NOR
Version First Reported In:	2.0.17
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Kaffeine Output GDB thread dump

Description i-bugs-kde-org-ushfas 2018-11-19 18:25:43 UTC

SUMMARY

Switching to next channel sometimes freezes kaffeine. No log messages in the console. Switch between fullscreen and not fullscreen works and also quiting.

The amount of channel switching varies (5-15). I have the feeling that in fullscreen mode it happens earlier.

There are also a lot of warnings which are hard to interpret for me.


STEPS TO REPRODUCE
1. Start kaffeine
2. Switch channels multiple times with Page-Down

OBSERVED RESULT
Freezes and the new channel isn't shown.


EXPECTED RESULT
The video of the new TV channel is shown.

SOFTWARE/OS VERSIONS
Fedora 29
kaffeine-2.0.15-2.fc29.x86_64
qt5-qtbase-5.11.1-9.fc29.x86_64

ADDITIONAL INFORMATION
I ran kaffeine with -d to get some debug information. I ran gdb with "thread apply all bt" to get a thread dump. Both are attached.

Comment 1 i-bugs-kde-org-ushfas 2018-11-19 18:26:26 UTC

Created attachment 116407 [details]
Kaffeine Output

Comment 2 i-bugs-kde-org-ushfas 2018-11-19 18:26:59 UTC

Created attachment 116408 [details]
GDB thread dump

Comment 3 Mauro Carvalho Chehab 2019-05-03 19:36:28 UTC

I found a longstanding bug at Kaffeine, with got fixed at version 2.0.17:

https://cgit.kde.org/kaffeine.git/commit/?id=7960208dad913d331ffdd6a129bfdc935337a4e5

Basically, it is a race condition that happens during scan time, but may also happen while doing channel switch.

Could you please test if Kaffeine 2.0.17 solves the issue you're facing?

Comment 4 tbs_gmbh 2020-04-24 12:52:42 UTC

Hi, 
Our TBS Tuner devices also have the same issue with switching channels on Kaffeine Player. The race condition is still happening in v2.0.18. I have added a 1-second delay to release DVB tuner from the previous playback and the freeze no longer happens again. Please find my GitHub pull request commit here:

https://github.com/KDE/kaffeine/pull/4/commits/866c8b519f65aee741ae92cd2459834f52f6c672

Thanks.