Bug 368140

Summary:	In 16.08.0 the project monitor remains blank (gray) while clips are playing
Product:	[Applications] kdenlive	Reporter:	Aagam Shah <aagamshah666>
Component:	Rendering & Export	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED UPSTREAM
Severity:	grave	CC:	djuzgado, gnowak, paul, robilaci, uvizoceke-8003, wegwerf-1-2-3
Priority:	NOR
Version First Reported In:	16.08.0
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Video of the Issue ( Works fine in VLC ) Fedora24 package management history

Description Aagam Shah 2016-09-02 07:55:50 UTC

Created attachment 100893 [details]
Video of the Issue ( Works  fine in VLC )

+++ This bug was initially created as a clone of Bug #366806 +++

Whenever I try to play a clip (either from the project bin or from the tracks) the project monitor remains blank (gray). There is sound, the overlays work. I can even edit the video (blindly) but I can't seem to turn on motion picture in the project monitor. 

My version info are 
OS : Ubuntu 15.10 (x64)
Graphics Card: NVIDEA
 Kdnlive: 16.08.0
Downloaded from: PPA of kdnlive
Kde Frameworks: 5.15.0
Qt version : 5.4.2

OpenGL info 

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile 
OpenGL core profile version string: 3.3 (Core Profile) Mesa 11.0.2
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 11.0.2
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 11.0.2
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:
.

Comment 1 Aagam Shah 2016-09-02 08:59:42 UTC

------------------Update------------------------
On running kdenlive it starting with error 
could not find drkonqi at : /usr/lib/x86_64-linux-gnu/libexec/drkonqi

But on finding it using $locate drkonqi

it was found at /usr/lib/kde4/libexec/drkonqi

Comment 2 uvizoceke-8003 2016-09-05 12:01:05 UTC

Created attachment 100935 [details]
Fedora24 package management history

Before these transactions : bug not present.
After these transactions : bug present.

Comment 3 uvizoceke-8003 2016-09-05 12:01:45 UTC

Same issue, although everything worked fine a few days ago.
Project monitor, or clip monitor, stay black when i click the "play" button.
I tried to reset settings : problem still there.
I tried to delete kdenlive config folders in my home directory : problem still there.
I tried to create a new project, and only insert a videoclip without adding any effect : problem still there. (so no relation to bug ID 367686)

I run Kdenlive 16.04.3 on up-to-date Fedora 24 MATE spin with 4.7.2-201 kernel and NVIDIA 367.44 proprietary drivers for my GeForce GTX 970.

I tried with kernel 4.6.7-300, problem still there.

Please find my package manager history in attachments. Does one of these transactions could have created the problem ? They are the only system modifications I did between the moment the project monitor in kdenlive worked and the moment it doesn't work anymore. Maybe xorg server package updates ?

Comment 4 Paul Konecny 2016-10-06 09:18:20 UTC

I think it has something to do with your nvidia card. Are you using tthe nvidia driver only or the bumblebee project? Can you try it with a live system without the nvidia driver installed? 
This seems related to this issue: 
https://bugs.kde.org/show_bug.cgi?id=361374

Cheers!