我正在编写一个程序来从网络摄像头获取视频,并将其显示在Tkinter窗口中。我编写了以下代码,我在Ubuntu 12.04上运行。
#!/usr/bin/env python
import sys, os, gobject
from Tkinter import *
import pygst
pygst.require("0.10")
import gst
# Goto GUI Class
class Prototype(Frame):
def __init__(self, parent):
gobject.threads_init()
Frame.__init__(self, parent)
# Parent Object
self.parent = parent
self.parent.title("WebCam")
self.parent.geometry("640x560+0+0")
self.parent.resizable(width=FALSE, height=FALSE)
# Video Box
self.movie_window = Canvas(self, width=640, height=480, bg="black")
self.movie_window.pack(side=TOP, expand=YES, fill=BOTH)
# Buttons Box
self.ButtonBox = Frame(self, relief=RAISED, borderwidth=1)
self.ButtonBox.pack(side=BOTTOM, expand=YES, fill=BOTH)
self.closeButton = Button(self.ButtonBox, text="Close", command=self.quit)
self.closeButton.pack(side=RIGHT, padx=5, pady=5)
gotoButton = Button(self.ButtonBox, text="Start", command=self.start_stop)
gotoButton.pack(side=RIGHT, padx=5, pady=5)
# Set up the gstreamer pipeline
self.player = gst.parse_launch ("v4l2src ! video/x-raw-yuv,width=640,height=480 ! ffmpegcolorspace ! xvimagesink")
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 start_stop(self):
if self.gotoButton["text"] == "Start":
self.gotoButton["text"] = "Stop"
self.player.set_state(gst.STATE_PLAYING)
else:
self.player.set_state(gst.STATE_NULL)
self.gotoButton["text"] = "Start"
def on_message(self, bus, message):
t = message.type
if t == gst.MESSAGE_EOS:
self.player.set_state(gst.STATE_NULL)
self.button.set_label("Start")
elif t == gst.MESSAGE_ERROR:
err, debug = message.parse_error()
print "Error: %s" % err, debug
self.player.set_state(gst.STATE_NULL)
self.button.set_label("Start")
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":
# Assign the viewport
imagesink = message.src
imagesink.set_property("force-aspect-ratio", True)
imagesink.set_xwindow_id(self.movie_window.window.xid)
def main():
root = Tk()
app = Prototype(root)
app.pack(expand=YES, fill=BOTH)
root.mainloop()
if __name__ == '__main__':
main()
程序运行时,我的问题既不是ButtonBox也不是输出窗口中的VideoBox显示。我怎样才能解决这个问题?我确实在其他网站上查找了可能的解决方案(例如http://pygstdocs.berlios.de/#projects或Way to play video files in Tkinter?),但是他们的代码含义非常有限。
在进行建议的更改和其他几个按钮以使按钮工作后,我意识到当我运行程序时,显示窗口与主窗口不同。有没有办法在使用tkinter时将视频显示在主窗口中?
答案 0 :(得分:2)
看起来你的Prototype类是一个Tkinter框架,但你似乎没有把它打包/放在任何地方。
...
app = Prototype(root)
app.pack(expand=YES, fill=BOTH)
root.mainloop()
答案 1 :(得分:1)
我终于找到了问题的解决方案。我意识到错误是在线 imagesink.set_xwindow_id(self.movie_window.window.xid)
我改为 imagesink.set_xwindow_id(self.movie_window.winfo_id())
错误在于我使用了window.xid,它是gtk小部件的一个属性。在tkinter中,winfo_id()返回tkinter小部件的窗口标识符。有关详细信息http://effbot.org/tkinterbook/widget.htm#Tkinter.Widget.winfo_id-method