Q媒体播放器.如何播放具有多个音频的视频?
问题描述
有一个包含两个音轨的视频文件:
There is a video file with two audio tracks:
Duration: 01:05:09.12, start: 0.000000, bitrate: 2781 kb/s
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 1998 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s
Stream #0:2: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s
用这段代码玩它:
self.player = QMediaPlayer()
self.player.setMedia(QMediaContent(QUrl.fromLocalFile(fileName)))
self.player.play()
播放视频和第一个音轨.Н如何切换到第二个音轨?
Video and first audio track is played. Нow to switch to the second audio track?
解决方案
正如@musicamante 在评论中指出的那样，解决方案是访问 QMediaStreamsControl 但 PyQt5 没有公开它.
As @musicamante points out in the comments, the solution is to access the QMediaStreamsControl but PyQt5 does not expose it.
相反，PySide2 确实公开了它，解决方案是使用 shiboken2 进行投射:
Instead PySide2 does expose it and the solution is to cast using shiboken2:
import os
from PySide2 import QtCore, QtWidgets, QtMultimedia, QtMultimediaWidgets
import shiboken2
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
video_widget = QtMultimediaWidgets.QVideoWidget()
self.player = QtMultimedia.QMediaPlayer(
self, QtMultimedia.QMediaPlayer.VideoSurface
)
file = os.path.join(os.path.dirname(os.path.realpath(__file__)), "test5.mkv")
self.player.setMedia(
QtMultimedia.QMediaContent(QtCore.QUrl.fromLocalFile(file))
)
self.player.setVideoOutput(video_widget)
self.player.play()
self.setCentralWidget(video_widget)
control = self.player.service().requestControl(
"org.qt-project.qt.mediastreamscontrol/5.0"
)
qptr = shiboken2.getCppPointer(control)[0]
self.qcontrol = shiboken2.wrapInstance(qptr, QtMultimedia.QMediaStreamsControl)
self.resize(640, 480)
def contextMenuEvent(self, event):
menu = QtWidgets.QMenu()
group = QtWidgets.QActionGroup(menu)
group.setExclusive(True)
index = 0
for i in range(self.qcontrol.streamCount()):
t = self.qcontrol.streamType(i)
if t == QtMultimedia.QMediaStreamsControl.AudioStream:
action = menu.addAction("Audio-{}".format(index))
action.setCheckable(True)
if self.qcontrol.isActive(i):
action.setChecked(True)
action.setData(i)
menu.addAction(action)
index += 1
action = menu.exec_(self.mapToGlobal(event.pos()))
if action is not None:
i = action.data()
self.qcontrol.setActive(i, True)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
在 pyqt5 的情况下，您应该使用 sip 和以下代码:
In the case of pyqt5 you should use sip with the following code:
import os
from PyQt5 import QtCore, QtWidgets, QtMultimedia, QtMultimediaWidgets
import sip
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
video_widget = QtMultimediaWidgets.QVideoWidget()
self.player = QtMultimedia.QMediaPlayer(
self, QtMultimedia.QMediaPlayer.VideoSurface
)
file = os.path.join(os.path.dirname(os.path.realpath(__file__)), "test5.mkv")
self.player.setMedia(
QtMultimedia.QMediaContent(QtCore.QUrl.fromLocalFile(file))
)
self.player.setVideoOutput(video_widget)
self.player.play()
self.setCentralWidget(video_widget)
control = self.player.service().requestControl(
"org.qt-project.qt.mediastreamscontrol/5.0"
)
self.qcontrol = sip.cast(control, QtMultimedia.QMediaStreamsControl)
self.resize(640, 480)
def contextMenuEvent(self, event):
menu = QtWidgets.QMenu()
group = QtWidgets.QActionGroup(menu)
group.setExclusive(True)
index = 0
for i in range(self.qcontrol.streamCount()):
t = self.qcontrol.streamType(i)
if t == QtMultimedia.QMediaStreamsControl.AudioStream:
action = menu.addAction("Audio-{}".format(index))
action.setCheckable(True)
if self.qcontrol.isActive(i):
action.setChecked(True)
action.setData(i)
menu.addAction(action)
index += 1
action = menu.exec_(self.mapToGlobal(event.pos()))
if action is not None:
i = action.data()
self.qcontrol.setActive(i, True)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
但正如 QMediaStreamsControl 所指出的，PyQt5 中不可用，因此解决方案是公开它，为此您必须:
But as pointed out by QMediaStreamsControl is not available in PyQt5, so a solution is to expose it and for this you must:
- 下载 PyQt5 源码:https://pypi.python.org/packages/source/P/PyQt5/PyQt5-5.14.2.tar.gz
在 PyQt5 源代码的sip/QtMultimedia"文件夹中创建文件 qmediastreamscontrol.sip.
- Download PyQt5 source code: https://pypi.python.org/packages/source/P/PyQt5/PyQt5-5.14.2.tar.gz
Create the file qmediastreamscontrol.sip in "sip/QtMultimedia" folder of the PyQt5 source code.
qmediastreamscontrol.sip
class QMediaStreamsControl : QMediaControl
{
%TypeHeaderCode
#include <qmediastreamscontrol.h>
%End
public:
enum StreamType {
UnknownStream,
VideoStream,
AudioStream,
SubPictureStream,
DataStream
};
virtual ~QMediaStreamsControl();
virtual int streamCount() = 0;
virtual QMediaStreamsControl::StreamType streamType(int streamNumber) = 0;
virtual QVariant metaData(int streamNumber, const QString &key) = 0;
virtual bool isActive(int streamNumber) = 0;
virtual void setActive(int streamNumber, bool state) = 0;
signals:
void streamsChanged();
void activeStreamsChanged();
protected:
%If (Qt_5_6_1 -)
explicit QMediaStreamsControl(QObject *parent /TransferThis/ = 0);
%End
%If (- Qt_5_6_1)
QMediaStreamsControl(QObject *parent /TransferThis/ = 0);
%End
};
将 %Include qmediastreamscontrol.sip 添加到文件 sip/QtMultimedia/QtMultimediamod.sip 的末尾
Add %Include qmediastreamscontrol.sip to the end of file sip/QtMultimedia/QtMultimediamod.sip
使用修改后的源代码编译安装PyQt5.
Compile and install PyQt5 using the modified source code.
总结:
如果你使用 pyside2 解决方案很简单.
If you use pyside2 the solution is simple.
如果你使用 pyqt5，你将不得不修改它的源代码，编译并安装它.希望 @musicamante 报告类 QMediaStreamsControl 在 pyqt5 的未来版本中公开
If you use pyqt5 you will have to modify its source code, compile it and install it. Hopefully with the @musicamante report class QMediaStreamsControl is exposed in future releases of pyqt5
相关文章