我在vala中播放mjpeg流时遇到问题。
我构建了我的管道,它只使用两个元素(videotestsrc和cluttersink),但是如果我想添加更多,我得到一个“内部数据流错误”和“流媒体任务暂停,原因没有链接(-1) )”。 如果我手动运行管道,它可以工作:
gst-launch souphttpsrc location=http://mjpeg.sanford.io/count.mjpeg ! multipartdemux ! jpegdec ! autovideosink
这是我的流媒体课程:
public class Stream : Clutter.Actor {
Clutter.Texture video;
public dynamic Gst.Element playbin;
public Gst.Pipeline pipeline;
public Gst.Element demux;
public Gst.Element jpegdec;
public Gst.Element outputsink;
public dynamic Gst.Element src;
public dynamic Gst.Element video_sink;
public Stream(){
print("stream");
video = new Clutter.Texture ();
this.pipeline = new Gst.Pipeline("videopipeline");
this.src = Gst.ElementFactory.make ("souphttpsrc","httpsrc");
this.demux = Gst.ElementFactory.make ("multipartdemux","demux");
this.jpegdec = Gst.ElementFactory.make ("jpegdec","jpegdec");
this.outputsink = Gst.ElementFactory.make("autovideosink","output");
this.video_sink = Gst.ElementFactory.make ("cluttersink", "source");
this.video_sink.texture = video;
this.src.set("location","http://mjpeg.sanford.io/count.mjpeg");
this.pipeline.add_many(this.src,this.demux,this.jpegdec,this.outputsink,this.video_sink);
this.src.link(this.demux);
this.demux.link(this.jpegdec);
this.jpegdec.link(this.outputsink);
this.outputsink.link(this.video_sink);
this.add_child (video);
this.pipeline.set_state(Gst.State.PLAYING);
}
}
以下是完整的错误日志: http://pastebin.com/b9GnA5ke
答案 0 :(得分:1)
您不能将两个接收器元素连接到jpegdec。如果你需要这样做,你应该使用" tee"元素,同时确保使用添加"队列"到发球台的每个分支。
从jpegdec到cluttersink也可能存在上限问题。我按如下方式构建它:
souphttpsrc ! multipartdemux ! jpegdec ! tee name=t ! queue ! videoconvert ! autovideosink t. ! queue ! videoconvert ! cluttersink