Linux 上 PyQt5 QMultimedia 的分段错误答案

【问题标题】：Segmentation error with PyQt5 QMultimedia on LinuxLinux 上 PyQt5 QMultimedia 的分段错误
【发布时间】：2020-04-25 21:44:32
【问题描述】：

我在 Ubuntu 18.04.3 LTS 上使用 PyQt5。我正在尝试使用 QtMultimedia.QMediaPlayer 播放 .mp3 文件。这是我的代码：

import sys

from PyQt5 import QtCore, QtMultimedia
from PyQt5.QtWidgets import QApplication, QMainWindow


class MyWidget(QMainWindow):
    def __init__(self):
        super().__init__()
        media = QtCore.QUrl.fromLocalFile(sys.path[0] + '/sounds/banjo_A5_forte_normal.mp3')
        content = QtMultimedia.QMediaContent(media)
        self.player = QtMultimedia.QMediaPlayer()
        self.player.setMedia(content)
        self.player.play()


app = QApplication(sys.argv)
ex = MyWidget()
ex.show()
sys.exit(app.exec_())

但是当我运行它时它会得到 SIGSEGV。

当我在 PyCharm 中调试时，将断点设置为 self.player = QtMultimedia.QMediaPlayer() 并恢复程序，它可以工作但会发出警告：

(python:12491): GStreamer-WARNING **: 17:53:39.905: Failed to load plugin '/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so': /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so: undefined symbol: gst_gl_display_egl_get_from_native

(python:12491): GStreamer-WARNING **: 17:53:40.030: Failed to load plugin '/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so': /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so: undefined symbol: gst_gl_display_egl_get_from_native

编辑：来自 cmets 的命令。不能只发布“主要是代码”

ldd /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so 的输出：

    linux-vdso.so.1 (0x00007ffc8f5b4000)
    libgstcodecparsers-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstcodecparsers-1.0.so.0 (0x00007f1458a4b000)
    libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 (0x00007f145883a000)
    libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1 (0x00007f145861c000)
    libva-drm.so.2 => /usr/lib/x86_64-linux-gnu/libva-drm.so.2 (0x00007f1458419000)
    libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007f145820e000)
    libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f1458004000)
    libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f1457ccc000)
    libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f1457a40000)
    libva-x11.so.2 => /usr/lib/x86_64-linux-gnu/libva-x11.so.2 (0x00007f145783a000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f1457636000)
    libEGL.so.1 => /usr/lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f1457422000)
    libgmodule-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007f145721e000)
    libva-wayland.so.2 => /usr/lib/x86_64-linux-gnu/libva-wayland.so.2 (0x00007f1457019000)
    libva.so.2 => /usr/lib/x86_64-linux-gnu/libva.so.2 (0x00007f1456df8000)
    libwayland-client.so.0 => /usr/lib/x86_64-linux-gnu/libwayland-client.so.0 (0x00007f1456be9000)
    libgstgl-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstgl-1.0.so.0 (0x00007f1456983000)
    libgstpbutils-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0 (0x00007f145674b000)
    libgstvideo-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstvideo-1.0.so.0 (0x00007f14564b2000)
    libgstbase-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstbase-1.0.so.0 (0x00007f145623d000)
    libgstallocators-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstallocators-1.0.so.0 (0x00007f1456039000)
    libgstreamer-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0 (0x00007f1455cfe000)
    libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007f1455aaa000)
    libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f1455793000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f14553f5000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f14551d6000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1454de5000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f1454bdd000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f1458f6c000)
    libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f14549cb000)
    libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f14547a3000)
    libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f1454572000)
    libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f14542bc000)
    libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f14540b6000)
    libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007f1453eae000)
    libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f1453cac000)
    libwayland-egl.so.1 => /usr/lib/x86_64-linux-gnu/libwayland-egl.so.1 (0x00007f1453aaa000)
    libgbm.so.1 => /usr/lib/x86_64-linux-gnu/libgbm.so.1 (0x00007f145389c000)
    libgudev-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgudev-1.0.so.0 (0x00007f1453692000)
    libgstaudio-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgstaudio-1.0.so.0 (0x00007f145341d000)
    libgsttag-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libgsttag-1.0.so.0 (0x00007f14531e2000)
    liborc-0.4.so.0 => /usr/lib/x86_64-linux-gnu/liborc-0.4.so.0 (0x00007f1452f66000)
    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f1452cf4000)
    libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f1452af0000)
    libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f14528ea000)
    libwayland-server.so.0 => /usr/lib/x86_64-linux-gnu/libwayland-server.so.0 (0x00007f14526d7000)
    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f14524a5000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f1452288000)
    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f1452073000)

【问题讨论】：

标签： python linux pyqt pyqt5 gstreamer

【解决方案1】：

我使用以下命令在 docker(ubuntu:18.04) 中启用 Qt MultiMedia，所以我想它也应该为您服务。

sudo apt-get install -y --no-install-recommends \
        libgstreamer1.0-0 \
        gstreamer1.0-plugins-base \
        gstreamer1.0-plugins-good \
        gstreamer1.0-plugins-bad \
        gstreamer1.0-plugins-ugly \
        gstreamer1.0-libav \
        gstreamer1.0-doc \
        gstreamer1.0-tools \
        libpulse-mainloop-glib0 \
        alsa-base \
        alsa-utils \
        pulseaudio

【讨论】：

忘记了这个。 apt 说 gstreamer1.0-plugins-bad 坏了。俄语错误消息：Следующие пакеты имеют неудовлетворённые зависимости: gstreamer1.0-plugins-bad : Зависит: libgstreamer-plugins-bad1.0-0 (= 1.14.0-1ubuntu1) но 1.14.5-0ubuntu1~18.04.1 должен быть установлен E: Невозможно исправить ошибки: у вас зафиксированы сломанные пакеты. Installed without -bad package, error is the same
@TimofeyX 你试过删除我命令的那部分吗？如果您删除该依赖项，它会起作用吗？一周前我用 docker 测试过，但没有收到警告
是的；我只是不小心发送了不完整的评论，现在已经编辑了
@TimofeyX 对于您必须翻译的内容，我不懂俄语，而且您的回答似乎令人困惑，1）您是否尝试过删除我的那部分命令？，2）我的解决方案对您有用?, 3) 你是如何安装 pyqt5 的？ 4）ldd /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so的输出是什么？
是的，我删除了 -bad 部分。软件包安装成功，但我的程序给出了同样的错误。