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我已经安装了gstreamer,gst-plugins-bad及其 python 绑定。

以下代码从给定目录中选择一首歌曲并播放它。

import pygst
pygst.require("0.10")
import gst
import pygtk
import gtk
import os

class Main:
    def __init__(self):
        self.pipeline = gst.Pipeline("mypipeline")

        self.musicFiles = os.listdir("musicFiles")

        self.currentSong = self.musicFiles[0]

        self.findFile = gst.element_factory_make("filesrc", "file")
        self.findFile.set_property("location", "musicFiles/" + self.currentSong)
        self.pipeline.add(self.findFile)

        self.mad = gst.element_factory_make("mad", "mad")
        self.pipeline.add(self.mad)

        self.findFile.link(self.mad)

        self.audioconvert = gst.element_factory_make("audioconvert", "convert")
        self.pipeline.add(self.audioconvert)

        self.mad.link(self.audioconvert)

        self.audioresample = gst.element_factory_make("audioresample", "resample")
        self.pipeline.add(self.audioresample)

        self.audioconvert.link(self.audioresample)

        self.getbpm = gst.element_factory_make("bpmdetect", "bpm")
        self.pipeline.add(self.getbpm)

        self.audioresample.link(self.getbpm)

        self.sink = gst.element_factory_make("playsink", "sink")
        self.pipeline.add(self.sink)

        self.audioresample.link(self.sink)

        self.pipeline.set_state(gst.STATE_PLAYING)

start=Main()
gtk.main()

但是，当我尝试创建bpmdetect元素时，会出现以下错误：

Traceback (most recent call last):
  File "/Users/shubhitsingh/Desktop/Stuff/COLLEGE/US/Carnegie Mellon/Fall '12/15-112/Term Project/Practice/gstreamertutorial-1.py", line 49, in <module>
    start=Main()
  File "/Users/shubhitsingh/Desktop/Stuff/COLLEGE/US/Carnegie Mellon/Fall '12/15-112/Term Project/Practice/gstreamertutorial-1.py", line 37, in __init__
    self.getbpm = gst.element_factory_make("bpmdetect", "bpm")
ElementNotFoundError: bpmdetect

gst-plugins-bad可以毫无问题地创建其他元素。soundtouch它只是(bpmdetect和)下的两个元素pitch无法创建。帮助？

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