Loop a video with gst-rtsp-server

[Tyler Compton]

Hi list,

I've been trying to create an RTSP stream from a video file source and have
the video loop back to the start when it ends. This has ended up being
quite tricky and I suspect I'm missing something obvious. My pipeline looks
something like this:

filesrc location=video.mp4 ! parsebin ! rtph264pay name=pay0

My current solution is to subclass RTSPMedia and override the
do_handle_message method. I capture EOS messages and seek the pipeline back
to the start. However, this doesn't seem to have any effect. The stream
just ends like normal.

class MyRTSPMedia(GstRtspServer.RTSPMedia):
    def do_handle_message(self, message):
        print("Got message:", message.type)
        if message.type == Gst.MessageType.EOS:
            pipeline: Gst.Pipeline = self.get_property("element")
            seek_result = pipeline.seek(
                rate=1.0,
                format=Gst.Format.TIME,
                flags=Gst.SeekFlags.FLUSH,
                start_type=Gst.SeekType.SET,
                start=0,
                stop_type=Gst.SeekType.NONE,
                stop=-1)
            if not seek_result:
                logging.error(
                    f"Failed to seek stream back to start! Seek "
                    f"returned {seek_result}")
            return True
        return GstRtspServer.RTSPMedia.do_handle_message(self, message)

I provide this class to my RTSPMediaFactory with the set_media_gtype method.

I noticed that gst-rtsp-server reports the video length to the client, so
the client expects the stream to only last for as long as the original
video. I would like the client to treat the source as a live, unending
stream. Is it possible that this inaccurate runtime is the source of my
problem?
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