蟒蛇+ QT +的Gstreamer
题
我与PyQt的工作,并试图从网络摄像头获取视频的QT部件中播放。我发现对于C和Qt,以及Python和GTK,但没有对这个组合的PyQt和GStreamer中的教程。任何人得到这个工作?
此播放视频细,但在一个单独的窗口:
self.gcam = gst.parse_launch('v4l2src device=/dev/video0 ! autovideosink')
self.gcam.set_state(gst.STATE_PLAYING)
我需要的就是这样它在我的GUI窗口小部件中显示,以获得覆盖工作。谢谢,互联网的大师!
OK,所以我需要一些帮助,得到了很多更远,但仍。实际上,我写这篇Maemo操作,但下面的代码工作在我的Linux笔记本电脑的罚款:
class Vid:
def __init__(self, windowId):
self.player = gst.Pipeline("player")
self.source = gst.element_factory_make("v4l2src", "vsource")
self.sink = gst.element_factory_make("autovideosink", "outsink")
self.source.set_property("device", "/dev/video0")
self.scaler = gst.element_factory_make("videoscale", "vscale")
self.window_id = None
self.windowId = windowId
self.player.add(self.source, self.scaler, self.sink)
gst.element_link_many(self.source,self.scaler, self.sink)
bus = self.player.get_bus()
bus.add_signal_watch()
bus.enable_sync_message_emission()
bus.connect("message", self.on_message)
bus.connect("sync-message::element", self.on_sync_message)
def on_message(self, bus, message):
t = message.type
if t == gst.MESSAGE_EOS:
self.player.set_state(gst.STATE_NULL)
elif t == gst.MESSAGE_ERROR:
err, debug = message.parse_error()
print "Error: %s" % err, debug
self.player.set_state(gst.STATE_NULL)
def on_sync_message(self, bus, message):
if message.structure is None:
return
message_name = message.structure.get_name()
if message_name == "prepare-xwindow-id":
win_id = self.windowId
assert win_id
imagesink = message.src
imagesink.set_property("force-aspect-ratio", True)
imagesink.set_xwindow_id(win_id)
def startPrev(self):
self.player.set_state(gst.STATE_PLAYING)
print "should be playing"
vidStream = Vid(wId)
vidStream.startPrev()
其中WID是widget IM试图去显示在输出中。当我在N900上运行此窗口ID,出现黑屏和闪烁。有任何想法吗?我要死了!
编辑:我一直在问到发布完整的代码,尽管我仍然需要清理一下,这里的相关部分:
self.cameraWindow = QtGui.QWidget(self)
self.cameraWindow.setGeometry(QtCore.QRect(530, 20, 256, 192))
self.cameraWindow.setObjectName("cameraWindow")
self.cameraWindow.setAttribute(0, 1); # AA_ImmediateWidgetCreation == 0
self.cameraWindow.setAttribute(3, 1); # AA_NativeWindow == 3
global wId
wId = self.cameraWindow.winId()
self.camera = Vid(wId)
self.camera.startPrev()
class Vid:
def __init__(self, windowId):
self.player = gst.Pipeline("player")
self.source = gst.element_factory_make("v4l2src", "vsource")
self.sink = gst.element_factory_make("autovideosink", "outsink")
self.source.set_property("device", "/dev/video0")
#self.scaler = gst.element_factory_make("videoscale", "vscale")
self.fvidscale = gst.element_factory_make("videoscale", "fvidscale")
self.fvidscale_cap = gst.element_factory_make("capsfilter", "fvidscale_cap")
self.fvidscale_cap.set_property('caps', gst.caps_from_string('video/x-raw-yuv, width=256, height=192'))
self.window_id = None
self.windowId = windowId
print windowId
self.player.add(self.source, self.fvidscale, self.fvidscale_cap, self.sink)
gst.element_link_many(self.source,self.fvidscale, self.fvidscale_cap, self.sink)
bus = self.player.get_bus()
bus.add_signal_watch()
bus.enable_sync_message_emission()
bus.connect("message", self.on_message)
bus.connect("sync-message::element", self.on_sync_message)
def on_message(self, bus, message):
t = message.type
if t == gst.MESSAGE_EOS:
self.player.set_state(gst.STATE_NULL)
elif t == gst.MESSAGE_ERROR:
err, debug = message.parse_error()
print "Error: %s" % err, debug
self.player.set_state(gst.STATE_NULL)
def on_sync_message(self, bus, message):
if message.structure is None:
return
message_name = message.structure.get_name()
if message_name == "prepare-xwindow-id":
win_id = self.windowId
assert win_id
imagesink = message.src
imagesink.set_property("force-aspect-ratio", True)
imagesink.set_xwindow_id(win_id)
def startPrev(self):
self.player.set_state(gst.STATE_PLAYING)
def pausePrev(self):
self.player.set_state(gst.STATE_NULL)
这是几位拼凑,而现在我无法测试它,但也许这将是有帮助的人。祝你好运!
解决方案 2
明白了!它出现我需要迫使管道的分辨率相匹配,其中我被抽视频以小部件的分辨率:
self.fvidscale_cap = gst.element_factory_make( “capsfilter”, “fvidscale_cap”) self.fvidscale_cap.set_property( '帽',gst.caps_from_string( '视频/ X-原始YUV,宽度= 256,高度= 192'))
然后,只需添加这些到管道像其他元素,它的伟大工程。男人,我觉得自己现在看着它,但是当我还在怦怦跳我的头靠在墙上几天它不是那么明显......
其他提示
如果您是发生在使用PySide而不是PyQt的比Linux,winId(其他的平台上)返回PyCObject其中的不能直接与本地函数或其他模块的使用。在我的情况下,该派上了用场,在Microsoft Windows上使用的GStreamer(pygst)与PySide时:
from ctypes import pythonapi, c_void_p, py_object
...
if message_name == 'prepare-xwindow-id':
# convert winId from PyCObject to void pointer
pythonapi.PyCObject_AsVoidPtr.restype = c_void_p
pythonapi.PyCObject_AsVoidPtr.argtypes = [py_object]
hWnd = pythonapi.PyCObject_AsVoidPtr(self.videoWidget.winId())
# set window handle to video sink
self.videoSink.set_xwindow_id(hWnd)
Ptterb可您发布完整的代码吗?
我复制你的代码。结果 加入fvidscale_cap到管道,具有:
self.player.add(self.source, self.scaler, self.fvidscale_cap, self.sink)
gst.element_link_many(self.source,self.scaler, self.fvidscale_cap, self.sink)
从主程序我创建一个新的QWidget,并通过其winId()到VID构造函数。结果, 窗口小部件开始加载,但崩溃。
在输出表示:结果 应该扮演结果 段故障
粘贴的代码不表示GObject的载荷,它不能被关闭。 我花了好一会儿找出少了什么。由于君具有 一个工作音频例子。
import gobject, pygst
pygst.require('0.10')
import gst
from PyQt4.QtGui import QMainWindow, QWidget, QApplication
import sys
class Video(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
container = QWidget()
self.setCentralWidget(container)
self.windowId = container.winId()
self.setGeometry(300,300,640,480)
self.show()
def setUpGst(self):
self.player = gst.Pipeline("player")
source = gst.element_factory_make("v4l2src", "vsource")
sink = gst.element_factory_make("xvimagesink", "sink")
fvidscale_cap = gst.element_factory_make("capsfilter", "fvidscale_cap")
fvidscale = gst.element_factory_make("videoscale", "fvidscale")
caps = gst.caps_from_string('video/x-raw-yuv')
fvidscale_cap.set_property('caps', caps)
source.set_property("device", "/dev/video0")
self.player.add(source, fvidscale, fvidscale_cap, sink)
gst.element_link_many(source,fvidscale, fvidscale_cap, sink)
bus = self.player.get_bus()
bus.add_signal_watch()
bus.enable_sync_message_emission()
bus.connect("message", self.on_message)
bus.connect("sync-message::element", self.on_sync_message)
def on_message(self, bus, message):
t = message.type
if t == gst.MESSAGE_EOS:
self.player.set_state(gst.STATE_NULL)
print "end of message"
elif t == gst.MESSAGE_ERROR:
err, debug = message.parse_error()
print "Error: %s" % err, debug
self.player.set_state(gst.STATE_NULL)
def on_sync_message(self, bus, message):
if message.structure is None:
return
message_name = message.structure.get_name()
if message_name == "prepare-xwindow-id":
win_id = self.windowId
assert win_id
imagesink = message.src
imagesink.set_xwindow_id(win_id)
def startPrev(self):
self.player.set_state(gst.STATE_PLAYING)
print "should be playing"
if __name__ == "__main__":
gobject.threads_init()
app = QApplication(sys.argv)
video = Video()
video.setUpGst()
video.startPrev()
sys.exit(app.exec_())