我在使用 disco 19-04 时遇到了图形问题。
此 Python 代码可以重现它：
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QGridLayout
from PyQt5.QtMultimediaWidgets import QVideoWidget
from PyQt5.QtMultimedia import QMediaPlayer
class Main(QWidget):
def __init__(self):
super().__init__()
self.gl = QGridLayout(self)
self.video = QVideoWidget()
self.gl.addWidget(self.video)
self.player = QMediaPlayer()
self.player.setVideoOutput(self.video)
self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
main = Main()
sys.exit(app.exec_())
gdb的回溯：
Thread 1 "python3" received signal SIGSEGV, Segmentation fault.
__memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:309
309 ../sysdeps/x86_64/multiarch/memcpy-ssse3.S: Aucun fichier ou dossier de ce type.
(gdb) bt
#0 __memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:309
#1 0x00007fffdb53b78a in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
#2 0x00007fffe808b331 in ?? () from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#3 0x00007fffe805590a in ?? () from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#4 0x00007fffe805721f in ?? () from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#5 0x00007fffe80614c8 in ?? () from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#6 0x00007fffe830d87e in ?? () from /lib/x86_64-linux-gnu/libgstbase-1.0.so.0
#7 0x00007fffe862592e in gst_element_change_state () from /lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#8 0x00007fffe862604e in ?? () from /lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#9 0x00007fffe873729d in ?? () from /lib/x86_64-linux-gnu/libQt5MultimediaGstTools.so.5
#10 0x00007fffe873647f in QGstreamerVideoWindow::QGstreamerVideoWindow(QObject*, QByteArray const&) ()
from /lib/x86_64-linux-gnu/libQt5MultimediaGstTools.so.5
#11 0x00007fffe8779823 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediaplayer.so
#12 0x00007fffe8785471 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediaplayer.so
#13 0x00007ffff2c3b567 in ?? () from /lib/x86_64-linux-gnu/libQt5Multimedia.so.5
#14 0x00007ffff2c7c0f9 in QMediaPlayer::QMediaPlayer(QObject*, QFlags<QMediaPlayer::Flag>) () from /lib/x86_64-linux-gnu/libQt5Multimedia.so.5
#15 0x00007ffff1d20079 in ?? () from /usr/lib/python3/dist-packages/PyQt5/QtMultimedia.cpython-37m-x86_64-linux-gnu.so
#16 0x00007ffff1d20163 in ?? () from /usr/lib/python3/dist-packages/PyQt5/QtMultimedia.cpython-37m-x86_64-linux-gnu.so
#17 0x00007ffff34f16f4 in ?? () from /usr/lib/python3/dist-packages/sip.cpython-37m-x86_64-linux-gnu.so
...
我认为这不是 gstreamer 中的错误，而是视频驱动程序问题。
我的配置：
$ vainfo
libva info: VA-API version 1.4.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_1_4
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.4 (libva 2.4.0)
vainfo: Driver version: Intel i965 driver for Intel(R) GM45 Express Chipset - 2.3.0
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointVLD
$ glxinfo -B
name of display: :0
display: :0 screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
Vendor: Intel Open Source Technology Center (0x8086)
Device: Mesa DRI Mobile Intel® GM45 Express Chipset (0x2a42)
Version: 19.0.8
Accelerated: yes
Video memory: 1536MB
Unified memory: yes
Preferred profile: compat (0x2)
Max core profile version: 0.0
Max compat profile version: 2.1
Max GLES1 profile version: 1.1
Max GLES[23] profile version: 2.0
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset
OpenGL version string: 2.1 Mesa 19.0.8
OpenGL shading language version string: 1.20
OpenGL ES profile version string: OpenGL ES 2.0 Mesa 19.0.8
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16
我知道这个错误： https://bugs.launchpad.net/ubuntu/+source/intel-vaapi-driver/+bug/1813131
但是他们说这个错误已经通过软件包 intel-vaapi-driver - 2.3.0-0ubuntu2 解决了，而且我已更新此驱动程序：
$ apt-cache policy i965-va-driver
i965-va-driver:
Installé : 2.3.0-0ubuntu2
Candidat : 2.3.0-0ubuntu2
Table de version :
*** 2.3.0-0ubuntu2 500
500 http://be.archive.ubuntu.com/ubuntu disco/universe amd64 Packages
100 /var/lib/dpkg/status