Created attachment 151992 [details] AV1 video sample STEPS TO REPRODUCE 1. Download the attached sample AV1 video (or from source: https://dl8.webmfiles.org/BigBuckBunny-AV1.webm) 2. Run dolphin from a terminal 3. Select "BigBuckBunny-AV1.webm" and click on the play icon in the preview panel to start the preview OBSERVED RESULT The preview does not work (both video and audio) and the following is printed in the terminal: QPainter::begin: Paint device returned engine == 0, type: 1 QPainter::begin: Paint device returned engine == 0, type: 1 QPainter::begin: Paint device returned engine == 0, type: 1 (dolphin:20414): GStreamer-Video-CRITICAL **: gst_video_center_rect: assertion 'src->h != 0' failed EXPECTED RESULT The preview works (both video and audio) SOFTWARE/OS VERSIONS - Distro: Gentoo - KDE Plasma Version: 5.25.5 - KDE Frameworks Version: 5.97.0 - Qt Version: 5.15.5 - Dolphin version: 22.08.1 - X11 ADDITIONAL INFORMATION I don't have the issue with HEVC or x264 video files. I tried with multiple AV1 videos with different extensions (avi,mkv,mp4): same issue Installed packages and versions: - kde-apps/ffmpegthumbs:22.08.1 - kde-apps/kdesdk-thumbnailers:22.08.1 - kde-apps/thumbnailers:22.08.1 - kde-frameworks/kimageformats:5.97.0 - dev-qt/qtimageformats:5.15.5-r2 - media-libs/phonon-gstreamer:4.10.0 Relevant USE flags: kde-frameworks/kfilemetadata epub ffmpeg
Installing media-plugins/gst-plugins-aom partially solved the issue. Now, previews work fine with mp4 and mkv files. However, with avi files, only the audio works, the image is stuck.
kdemultimedia is no longer maintained. If you have issues like you reported with current versions of our applications, please report the issue at the bugtracker of the application.
This is about ffmpegthumbs which is still maintained.
Moving to the correct category.
I re-tested this with Dolphin built from git-master (25.07.70) and it appears the bug has been fixed I downloaded the attached webm file and opened the folder in Dolphin. When I click the Play button in the preview pane, the preview starts playing. If you can reproduce this bug with Dolphin 25.07.70 or later, please re-open this bug. Thanks.
Thanks for checking - but than dolphin this bug was about ffmpegthumbs and if it seems we don't have a bugzilla category for ffmpegthumbs, and we should.
(In reply to Luigi Toscano from comment #6) > Thanks for checking - but than dolphin this bug was about ffmpegthumbs and > if it seems we don't have a bugzilla category for ffmpegthumbs, and we > should. There is - under 'Frameworks and Libraries'
Note that this is not related to ffmpegthumbs though (which handles the thumbnails in the dolphin main view and in tooltips). This is about the video preview in the side panel, which is managed by dolphin itself. So dolphin was indeed the correct category.