Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-114104

R8 is not supported on GLES 2.0 only systems

    XMLWordPrintable

Details

    • Bug
    • Resolution: Fixed
    • P2: Important
    • 6.5.9, 6.8.2, 6.9.0 FF
    • 6.5.1, 6.5
    • Multimedia
    • None
    • Raspberry pi 3 (bullseye 32 and 64 bit)
    • Linux/Wayland, Linux/X11, Linux/Other display system
    • a06348f81 (dev), 73331dc9b (6.8), 1c5d74b73 (tqtc/lts-6.5)
    • Multimedia wk 43-44, Multimedia wk 47-48

    Description

      I am maintaining a multimedia kiosk based on raspberry pi 3 based on Qt.

      With the latest version video did not work on the raspberry pi 3, but it did on the raspberry pi 4. 

      The issue seems to be that Qt tries to use R8 textures which are not supported in all GLES stacks. R8 and RG8 are both used when the output is NV12. R8 is used in more output formats, also in YUV. The raspberry pi 3 supports OpenGL ES 2.0 with the VC4 V3D 2.1 driver, and the raspberry pi 4 supports OpenGL ES 3.1 with the V3D 4.2 driver.

      I was able to play video in the raspberry pi 3 when I changed all R8 to RED_OR_ALPHA8 in qvideotexturehelper.cpp and change the shader to use the alpha channel in the yuv_triplane shader.

      This proves that the stack is able to play video if only the supported formats are used. 

      This workaround works in my specific situation, but it would be nice if qt multimedia works out of the box without modifications.

      More on:
      https://forum.qt.io/topic/145350/video-playback-with-ffmpeg-backend-does-not-work-on-the-raspberry-pi-3/8

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-129404 [Reg B2Qt 6.7.2 -> 6.7.3] video not played on embedded devices

          • 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
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-131114 Workaround needed for video pixel formats that use RG8 textures on GLES2

          • 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.
          • Closed
          No reviews matched the request. Check your Options in the drop-down menu of this sections header.

          Activity

            People

              mikko.hallamaa Mikko Hallamaa
              jorisvergeer Joris Vergeer
              Votes:
              1 Vote for this issue
              Watchers:
              7 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes