mpvwidget implemented with PyQt5 and QOpenGLWidget (currently used in http://github.com/cosven/feeluown)

mpv_qtwidget_opengl.py

# BSD 3-Clause License
# 
# Copyright (c) 2020, Cosven
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
# 
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
# 
# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


"""
Mainly learned from these two example.

- https://github.com/ozmartian/vidcutter/blob/793127c521b18f0bab19b67bc42e8da16a667afd/vidcutter/libs/mpvwidget.py
- https://github.com/mpv-player/mpv-examples/blob/master/libmpv/qt_opengl/mpvwidget.cpp
"""

from PyQt5.QtCore import Qt, QMetaObject, pyqtSlot
from PyQt5.QtWidgets import QOpenGLWidget, QApplication
from PyQt5.QtOpenGL import QGLContext

# HELP: currently, we need import GL module，otherwise it will raise seg fault on Linux(Ubuntu 18.04) 
from OpenGL import GL  # noqa

from mpv import MPV, _mpv_get_sub_api, _mpv_opengl_cb_set_update_callback, \
        _mpv_opengl_cb_init_gl, OpenGlCbGetProcAddrFn, _mpv_opengl_cb_draw, \
        _mpv_opengl_cb_report_flip, MpvSubApi, OpenGlCbUpdateFn, _mpv_opengl_cb_uninit_gl


def get_proc_addr(_, name):
    glctx = QGLContext.currentContext()
    if glctx is None:
        return 0
    addr = int(glctx.getProcAddress(name.decode('utf-8')))
    return addr


class MpvWidget(QOpenGLWidget):
    def __init__(self, parent=None):
        super().__init__(parent=parent)
        self.mpv = MPV(vo='opengl-cb', ytdl=True)
        self.mpv_gl = _mpv_get_sub_api(self.mpv.handle, MpvSubApi.MPV_SUB_API_OPENGL_CB)
        self.on_update_c = OpenGlCbUpdateFn(self.on_update)
        self.on_update_fake_c = OpenGlCbUpdateFn(self.on_update_fake)
        self.get_proc_addr_c = OpenGlCbGetProcAddrFn(get_proc_addr)
        _mpv_opengl_cb_set_update_callback(self.mpv_gl, self.on_update_c, None)
        self.frameSwapped.connect(self.swapped, Qt.DirectConnection)

    def initializeGL(self):
        _mpv_opengl_cb_init_gl(self.mpv_gl, None, self.get_proc_addr_c, None)

    def paintGL(self):
        # compatible with HiDPI display
        ratio = self.windowHandle().devicePixelRatio()
        w = int(self.width() * ratio)
        h = int(self.height() * ratio)
        _mpv_opengl_cb_draw(self.mpv_gl, self.defaultFramebufferObject(), w, -h)

    @pyqtSlot()
    def maybe_update(self):
        if self.window().isMinimized():
            self.makeCurrent()
            self.paintGL()
            self.context().swapBuffers(self.context().surface())
            self.swapped()
            self.doneCurrent()
        else:
            self.update()

    def on_update(self, ctx=None):
        # maybe_update method should run on the thread that creates the OpenGLContext,
        # which in general is the main thread. QMetaObject.invokeMethod can
        # do this trick.
        QMetaObject.invokeMethod(self, 'maybe_update')

    def on_update_fake(self, ctx=None):
        pass

    def swapped(self):
        _mpv_opengl_cb_report_flip(self.mpv_gl, 0)

    def closeEvent(self, _):
        self.makeCurrent()
        if self.mpv_gl:
            _mpv_opengl_cb_set_update_callback(self.mpv_gl, self.on_update_fake_c, None)
        _mpv_opengl_cb_uninit_gl(self.mpv_gl)
        self.mpv.terminate()


if __name__ == '__main__':
    import locale
    app = QApplication([])
    locale.setlocale(locale.LC_NUMERIC, 'C')
    widget = MpvWidget()
    widget.show()
    url = 'data/test.webm'
    widget.mpv.play(url)
    app.exec()

@kanehekili You can take a look at the implement in FeelUOwn project. It use the new render context API.
https://github.com/feeluown/FeelUOwn/blob/master/feeluown/gui/widgets/mpv.py