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Bug
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Resolution: Unresolved
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P1: Critical
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None
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6.8.5
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Linux/Yocto
First of all, this problem has only been confirmed on imx8m plus evk. I also tried imx8 quad max and didn't see similar issue.
Also, I am not sure if it is problem of using cloud device (https://hw-cloud.qt.io/), but I do not have imx8m plus evk myself, so I have to use that. And that is also the reason I can only test 6.8.5. Anyway, build and deploy the attached sample to imx8m plus evk. What I can see is:
1. With EGLFS, no video is playing. It is just white screen in VideoOutput. Nevertheless, app itself still runs and MediaPlayer seems to work. By this kind of log:
qml: MediaPlayer mediaStatus: 1
====== AIUR: 4.9.2 build on Oct 17 2024 06:05:58. ======
Core: MPEG4PARSER_06.22.07 build on Sep 27 2024 03:29:31
file: /usr/lib/imx-mm/parser/lib_mp4_parser_arm_elinux.so.3.2
------------------------
Track 00 [video_0] Enabled
Duration: 0:00:19.100000000
Language: eng
Mime:
video/x-h264, parsed=(boolean)true, alignment=(string)au, stream-format=(string)avc, width=(int)640, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)progressive, codec_data=(buffer)0164001effe100196764001eacd940a03db0110000030001000003003c0f162d9601000668ebe3cb22c0fdf8f800
------------------------
====== V4L2DEC: 1.24.7 build on Jul 1 2025 08:50:15. ======
QVncServer created on port 5900
qml: MediaPlayer mediaStatus: 2
qml: MediaPlayer mediaStatus: 4
====== AIUR: 4.9.2 build on Oct 17 2024 06:05:58. ======
Core: MPEG4PARSER_06.22.07 build on Sep 27 2024 03:29:31
file: /usr/lib/imx-mm/parser/lib_mp4_parser_arm_elinux.so.3.2
------------------------
Track 00 [video_0] Enabled
Duration: 0:00:19.100000000
Language: eng
Mime:
video/x-h264, parsed=(boolean)true, alignment=(string)au, stream-format=(string)avc, width=(int)640, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)progressive, codec_data=(buffer)0164001effe100196764001eacd940a03db0110000030001000003003c0f162d9601000668ebe3cb22c0fdf8f800
------------------------
====== V4L2DEC: 1.24.7 build on Jul 1 2025 08:50:15. ======
qml: MediaPlayer mediaStatus: 5
MediaPlayer can buffer the video (status 5).
2. With Wayland (weston by -platform wayland), I can't actually see what's going on (no VNC on Wayland) so I can't say if video plays or not. But MediaPlayer still can reach status 5 at the end.
However, the original reporter of this issue reports a much server situation that playing video causes kernel panic. "kernel_panic.log" was from Weston session and "kernel_panic_minimal-qml.log" from Qt Wayland Compoistor session. And it happens regardless of QPA, i.e. either it is EGLFS or Wayland (either Weston or Qt Wayland Compositor, e.g. Minimal QML). I myself cannot reproduce such issue. What I can confirm by my own eyes is video not showing up on EGLFS. It may need someone who has physical device to take a further look.
BTW, the original reporter always does "systemctl stop demolauncher" before launching the app. It does not do anything different I think (nothing different as far as I can tell).