Python:我如何从Gst视频播放箱中获得视频分辨率

Question

我有下面的代码，工作并在窗口中显示视频。有人可以帮助我，并给出一个简单的python示例，我如何提取视频文件的视频分辨率(宽度x高度)?

我被困在这个好几天了…如有任何帮助，我将不胜感激。

import os
import Tkinter as tkinter
import gi
gi.require_version('Gst', '1.0')
gi.require_version('GstVideo', '1.0')
from gi.repository import Gst, GObject, GstVideo
def set_frame_handle(bus, message, frame_id):
    if not message.get_structure() is None:
        if message.get_structure().get_name() == 'prepare-window-handle':
            display_frame = message.src
            display_frame.set_property('force-aspect-ratio', True)
            display_frame.set_window_handle(frame_id)
window = tkinter.Tk()
window.title('')
window.geometry('400x300-30-100')
Gst.init(None)
GObject.threads_init()
display_frame = tkinter.Frame(window, bg='')
display_frame.place(relx = 0, rely = 0, anchor = tkinter.NW, relwidth = 1, relheight = 1)
frame_id = display_frame.winfo_id()
player = Gst.ElementFactory.make('playbin', None)
filepath = os.path.realpath('kbps.mp4')
filepath2 = "file:///" + filepath.replace('\', '/').replace(':', '|')
print filepath2
player.set_property('uri', filepath2)
player.set_state(Gst.State.PLAYING)
bus = player.get_bus()
bus.enable_sync_message_emission()
bus.connect('sync-message::element', set_frame_handle, frame_id)
window.geometry('400x300+30+300')
window.update
window.mainloop()

Answer 1

设置URI后，将您的管道设置为PAUSED状态。一旦完成，您应该被预卷，并可以检查gst-video-pad上的当前上限。例如:

self._playBin.set_state(Gst.State.PAUSED)
self._playBin.get_state(5000000000)
videoPad=self._playBin.emit("get-video-pad", 0)
videoPadCapabilities=videoPad.get_current_caps()(success, videoWidth) = 
videoPadCapabilities.get_structure(0).get_int("width")
(success, videoHeight) = 
videoPadCapabilities.get_structure(0).get_int("height")