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  1. Qt
  2. QTBUG-131107

QVideoFrame::toImage / qImageFromVideoFrame not safe to call from worker thread

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 6.9
    • Multimedia
    • None
    • Linux/Wayland
    • 3de2cafdd (dev), 25c27eaa3 (6.8), f9b21ed6d (tqtc/lts-6.5)
    • Multimedia wk 47-48, Multimedia wk 51-2, Multimedia wk 5-6, Multimedia wk 7-8, Multimedia, weeks 9-10, Multimedia, weeks 11-12, Multimedia, weeks 13-14, Multimedia, weeks 15-16

    Description

      when built for opengl (as in QT_CONFIG(opengl)), qImageFromVideoFrame cannot be used from worker threads:

      • qImageFromVideoFrame calls initializeRHI
      • initializeRHI calls QRhiGles2InitParams::newFallbackSurface
      • QRhiGles2InitParams::newFallbackSurface docs state that "This function must only be called on the gui/main thread"

      when running with the wayland qpa plugin, a warning is emitted:
      > Attempting to create QWindow-based QOffscreenSurface outside the gui thread. Expect failures

      we should either document/assert or try to lift this requirement

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        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-130970 [wayland] qtmm examples crash on rockchip when using wayland

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-135598 [Windows] Sporadic crashes when call QVideoFrame::toImage() from working thread

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-109039 Can't save QVideoFrame as an image from QML App

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
          For Gerrit Dashboard: QTBUG-131107
          # Subject Branch Project Status CR V
          636409,4 Don't create thread-local OpenGL RHI in the worker thread dev qt/qtmultimedia Status: NEW 0 0

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              lars.sutterud Lars Sutterud
              timblechmann tim blechmann
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              Dates

                Created:
                Updated:

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