See video in URL field for example. When I was testing Kdenlive, I was playing back a clip in the timeline, then went to another tab, then back to the project monitor... but the screen was gray. No video. The only way it comes back is if I switch between some combination of tabs to bring it back. Reproducible: Always Steps to Reproduce: 1. Set up, say, the undo history widget to the right of the Project Monitor. 2. Playback the project in timeline (or don't). 3. Click the undo history tab to open the widget, then click back to the Project monitor. Actual Results: There is no video in monitor. Only gray. Expected Results: Video to appear as normal. Bug discovered on Kdenlive 15.13.0 latest git master build, Kubuntu 15.10 x64, KDE Frameworks 5.18.0 via Kubuntu backports ppa.
Hmm, cannot reproduce despite having the same config. Do you have a dual monitor setting (I mean physically 2 monitors attached to computer) ?
Ugh, gotta love the issues that can't be reproduced on the dev's end. No sir, just a single monitor, set to 1920 x 1080, 60hz refresh rate. I just tested a fresh install using the latest mlt .deb builds from Olivier Banus' ppa, and the latest Kdenlive git .deb builds from the Kubuntu-ci/unstable ppa. Same issue. :/ I'm also running two Nvidia GTX 660 graphics cards and the Nvidia 352.63 proprietary driver (the graphics cards are not SLI'd; Kubuntu is using the top one closes to the cpu on the motherboard, and ignoring the bottom one).
Last night, I tested for this issue using a laptop with Kubuntu 15.10 x64, KDE frameworks 15.18.0, Intel graphics, and the latest Kdenlive & mlt builds. Same issue on three separate machines. Could it be something in the backports ppa? The bug might lie somewhere in my layout, too. I'll do some more testing.
Update: Whenever the two monitors are tabbed together, this issue doesn't happen.
Maybe it's the packages I'm using or the way I'm installing Kdenlive? These are the packages I'm using: https://www.dropbox.com/sh/g85jnkzxwnrrg8x/AAAzdTE6-hvfk0B02iC4Zzh3a?dl=0. Could that be causing this issue at all? I'm experiencing this on all my devices I'm installing Kdenlive on, and their hardware is pretty diverse.
This issue doesn't seem to be present in the latest git master build via Kdenlive-master ppa for Ubuntu. I'll run a few more tests before marking this bug as resolved.
Git commit b5046ae634b8f0e05079606db8a1f45f1151d260 by Jean-Baptiste Mardelle. Committed on 29/07/2016 at 22:25. Pushed by mardelle into branch 'Applications/16.08'. Fix monitor sometimes blank when switching tab M +1 -0 src/monitor/monitor.cpp M +3 -1 src/monitor/monitormanager.cpp http://commits.kde.org/kdenlive/b5046ae634b8f0e05079606db8a1f45f1151d260
Excellent! Glad this was got resolved. :) Thanks JB.