[gst-devel] Playback Rate

[Ryan Ayers]

I am developing a streaming server that will stream avi files onto the network as MJPEG streams.  I am using the python bindings.  I am trying to change the playback rate using the event_new_seek function, but I am unable to make this work.  I can make it work using the decodebin or playbin however.  Here is the following code I am working on:

self._pipeline = gst.parse_launch("filesrc location=/home/test/test.avi ! avidemux ! queue ! ffdec_msmpeg4v2 ! jpegenc ! multipartmux ! multifdsink name=multifd")
event = gst.event_new_seek(2.0, gst.FORMAT_TIME, gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE, gst.SEEK_TYPE_NONE, 0, gst.SEEK_TYPE_NONE, 0)
if not self._pipeline.send_event(event):
    print 'always fails here'
state = self._pipeline.set_state(gst.STATE_PLAYING)
if state == gst.STATE_CHANGE_FAILURE:
    print 'do not get here, since we succeed'

However, when I connect to the stream, I get normal 1.0 playback speed.  Of course, this sounds right since the send_event failed.  Additionally, I have tried the above code by sending the event to the avidemux element and the send_event succeeds, but the stream still plays back at 1.0 speed.

Do you have any suggestions on how to achieve variable speed playback using the python bindings?

Ryan