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  1. Qt
  2. QTBUG-132458

[static linking] undefined symbols for ffmpeg plugin

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Details

    • Linux/Wayland, macOS
    • Multimedia wk 5-6, Multimedia wk 7-8, Multimedia, weeks 9-10, Multimedia, weeks 11-12, Multimedia, weeks 13-14, Multimedia, weeks 15-16, Multimedia, weeks 18-19

    Description

      trying to link the ffmpeg plugin statically gives a lot of undefined symbols for the ffmpeg backend:

        "_av_buffer_create", referenced from:
      QFFmpeg::VideoEncoder::processOne() in libffmpegmediaplugin.a[46](qffmpegvideoencoder.cpp.o)
      allocHWFrame(AVBufferRef*, __CVBuffer* const&) in libffmpegmediaplugin.a[54](qavfsamplebufferdelegate.mm.o)
  "_av_buffer_ref", referenced from:
      QFFmpeg::CodecContext::create(AVStream*, AVFormatContext*, QFFmpeg::CodecContext::VideoCodecCreationPolicy) in libffmpegmediaplugin.a[37](qffmpegcodeccontext.cpp.o)
      QFFmpeg::VideoFrameEncoder::initCodecContext() in libffmpegmediaplugin.a[48](qffmpegvideoframeencoder.cpp.o)
      QFFmpeg::VideoFrameEncoder::initCodecContext() in libffmpegmediaplugin.a[48](qffmpegvideoframeencoder.cpp.o)
      allocHWFrame(AVBufferRef*, __CVBuffer* const&) in libffmpegmediaplugin.a[54](qavfsamplebufferdelegate.mm.o)
[...]

      https://codereview.qt-project.org/c/qt/qtmultimedia/+/613823 contains a reproducer which fails to build (at least on macos and linux)

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-133914 FFmpeg plugin tests may fail to build on Linux and Android

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-126817 Qt6MultimediaConfig.cmake fails due to missing FFmpeg

          • 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; Flaky tests; 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
          For Gerrit Dashboard: QTBUG-132458
          # Subject Branch Project Status CR V
          641141,2 FFmpeg: link ffmpeg libs when linking qt statically dev qt/qtmultimedia Status: NEW 0 0

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              timblechmann tim blechmann
              timblechmann tim blechmann
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              Dates

                Created:
                Updated:

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