如何在python中打开和保存视频文件？

Question

I've just started to make a ubuntu application using PyGtk. My very first object is to open, convert and then save a video file. Ignoring convert phase, I'm going to implant open-save functions. But at the moment when I open a video file, and save it, I get non-video file with 11B size. I've just google this and found OpenCV for python. But I'm not sure if it's the best way to do it. I also think I'm going to use ffmpeg libraries to do some manipulates on video files. Is it what I want or there might be other built-in libraries?

By the way, here's my code to open and save the file :

    def on_openFile_clicked(self, widget):
        filename=None
        dialog = Gtk.FileChooserDialog("Please choose a file", self,
            Gtk.FileChooserAction.OPEN,
            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
             Gtk.STOCK_OPEN, Gtk.ResponseType.OK))

        response = dialog.run()
        self.add_filters(dialog)

        if response == Gtk.ResponseType.OK:
            filename = dialog.get_filename()
        elif response == Gtk.ResponseType.CANCEL:
            print 'Cancel Clicked'
        dialog.destroy()

        print "File Choosen: ", filename

    def add_filters(self, dialog):

        filter_py = Gtk.FileFilter()
        filter_py.set_name("Video Files")
        filter_py.add_mime_type("video/mp4")
        filter_py.add_mime_type("video/x-flv")
        dialog.add_filter(filter_py)

        filter_any = Gtk.FileFilter()
        filter_any.set_name("Any files")
        filter_any.add_pattern("*")
        dialog.add_filter(filter_any)

    def on_saveFile_clicked(self, widget):
        filename=None
        dialog = Gtk.FileChooserDialog("Please choose a file", self,
            Gtk.FileChooserAction.SAVE,
            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
             Gtk.STOCK_SAVE, Gtk.ResponseType.OK))

        response = dialog.run()
        self.add_filters(dialog)

        if response == Gtk.ResponseType.OK:
            filename = dialog.get_filename()
        elif response == Gtk.ResponseType.CANCEL:
            print 'Cancel Clicked'
        dialog.destroy()

        if filename != None:
            save_file=open(filename, 'w')
            save_file.write("Sample Data")
            save_file.close()
        print "File Saved: ", filename

Answer 1

I think OpenCV is the best way ! because of its diverse and powerful functions for processing media ! and also supports Windows , Linux , Mac OS , iOS and Android . OpenCV was designed for computational efficiency and with a strong focus on real-time applications. Written in optimized C/C++, the library can take advantage of multi-core processing . you can find many Video Analysis functions in OpenCV !