GStreamer上的視頻轉換？

Question

我正在嘗試創建一個非常不尋常的程序，它需要視頻才能從一個剪輯順暢地播放到下一個剪輯，而不會閃爍。此時，在流的結尾處，我將路徑更改爲下一個剪輯並將其設置爲再次播放。這個效果很好，除了在兩者之間有一點點眨眼之外，這不是最佳的。

我盤算我可以通過創建視頻片段之間的轉換擺脫這一點。但是，由於Python的GStreamer教程缺乏，我該怎麼做？

我使用Python 2.7，PyGTK的2.24，和GStreamer的。

這裏是我當前的代碼：

import pygtk 
pygtk.require('2.0') 
import gtk, pango 
import pygst 
pygst.require('0.10') 
import gst 
import Trailcrest 
import os, sys 

class Video: 

    def __init__(self): 

     def on_message(bus, message): 
      if message.type == gst.MESSAGE_EOS: 
       # End of Stream 
       player.set_state(gst.STATE_NULL) 
       player.set_property("uri", "file://" + os.getcwd() + "/VID/BGA-AMB-HABT-001.ogv") 
       player.set_state(gst.STATE_PLAYING) 
      elif message.type == gst.MESSAGE_ERROR: 
       player.set_state(gst.STATE_NULL) 
       (err, debug) = message.parse_error() 
       print "Error: %s" % err, debug 

     def on_sync_message(bus, message): 
      if message.structure is None: 
       return False 
      if message.structure.get_name() == "prepare-xwindow-id": 
       gtk.gdk.threads_enter() 
       gtk.gdk.display_get_default().sync() 
       win_id = videowidget.window.xid 
       imagesink = message.src 
       imagesink.set_property("force-aspect-ratio", True) 
       imagesink.set_xwindow_id(win_id) 
       gtk.gdk.threads_leave() 

     win = gtk.Window() 
     win.set_resizable(False) 
     win.set_has_frame(False) 
     win.set_position(gtk.WIN_POS_CENTER) 

     fixed = gtk.Fixed() 
     win.add(fixed) 
     fixed.show() 

     pixbuf = gtk.gdk.pixbuf_new_from_file_at_size("IMG/IMG-AMB-HABT-001.png", 640, 480) 
     pixbuf = pixbuf.scale_simple(640, 480, gtk.gdk.INTERP_BILINEAR) 
     pixmap, mask = pixbuf.render_pixmap_and_mask() 
     img = gtk.Image() 
     img.set_from_pixmap(pixmap, mask) 
     fixed.put(img, 0, 0) 
     img.show() 

     videowidget = gtk.DrawingArea() 
     fixed.put(videowidget, 0, 0) 
     videowidget.set_size_request(640, 480) 
     videowidget.show() 

     # Setup GStreamer 
     player = gst.element_factory_make("playbin", "MultimediaPlayer") 
     bus = player.get_bus() 
     bus.add_signal_watch() 
     bus.enable_sync_message_emission() 
     #used to get messages that GStreamer emits 
     bus.connect("message", on_message) 
     #used for connecting video to your application 
     bus.connect("sync-message::element", on_sync_message) 
     player.set_property("uri", "file://" + os.getcwd() + "/VID/BGA-AMB-HABT-001.ogv") 
     player.set_state(gst.STATE_PLAYING) 

     win.show() 

def main(): 
    gtk.gdk.threads_init() 
    gtk.main() 
    return 0 

if __name__ == "__main__": 
    Video() 
    main() 

Answer 1

終於找到this link。