如何使用gstreamer暂停后恢复播放？ [英] How to resume playing after paused using gstreamer?

问题描述

我为每个Gstreamer类型编写了C ++封装。他们是简单和直观，所以我不认为他们的实现需要在这里发布（虽然我可以发布他们（也许在github）如果需要出现）。

I've written C++ wrapper for each Gstreamer types. They're simple and intuitive, so I don't think their implementation needs to be posted here (though I could post them (maybe at github) if need arises).

我面临的问题是我开始播放视频（同时使用gst tee元素将其保存到文件）....并且当它正在播放，我暂停（从不同的线程），这是工作很大。然而，当我想恢复它，它不工作：

The problem I'm facing is that I start playing a video (and simulteneously saving it to a file using gst tee element)....and while it is playing, I pause (from different thread) which is working great. However, when I want to resume it, it doesn't work:

void pause()
{
    _pipeline.state(GST_STATE_PAUSED)
}

void resume()
{
    _pipeline.state(GST_STATE_PLAYING);
}

这里是 play c $ c>函数，其中我创建管道并将其状态设置为GST_STATE_PLAYING。

And here is the play() function where I create the pipeline and set it state to GST_STATE_PLAYING.

int play(std::string const & source_path, std::string const & save_as_file)
{
    gst::element source(source_path.substr(0,4) == "http" ? "souphttpsrc" : "filesrc", "media-source");
    gst::element demuxer("decodebin", "decoder");
    gst::element vconv("videoconvert",  "vconverter");
    gst::element vsink("autovideosink", "video-output");
    gst::element aconv("audioconvert",  "aconverter");
    gst::element asink("autoaudiosink", "audio-output");
    gst::element filesink("filesink", "file-sink");
    gst::element fq("queue", "file-queqe");
    gst::element tee("tee", "media-tee");
    gst::element aq("queue", "audio-queue");
    gst::element vq("queue", "video-queue");

    source.set("location", source_path.c_str());

    gst::bus bus = _pipeline.bus();
    guint bus_watch_id = _session.add_watch(bus);


    _pipeline.add(source, demuxer, vconv, vsink, aconv, asink, filesink, tee,fq, aq, vq);

    gst::element::link(source, tee); 

    gst::element::link(vq, vconv, vsink);
    gst::element::link(aq, aconv, asink);

    gst::pad tee_src_pad = tee.request_pad("src_%u");
    gst::pad demuxer_sink_pad = demuxer.static_pad("sink");

    gst::pad::link(tee_src_pad, demuxer_sink_pad);

    filesink.set("location",  save_as_file.c_str());

    gst::element::link(fq, filesink);

    gst::pad tee_src_pad2 = tee.request_pad("src_%u");
    gst::pad fq_pad = fq.static_pad ("sink");
    gst::pad::link(tee_src_pad2, fq_pad);

    gst::element::dynamic_link(demuxer, aq);
    gst::element::dynamic_link(demuxer, vq);

    g_print ("Now playing: %s\n", source_path.c_str());
    _pipeline.state(GST_STATE_PLAYING);

    //code
    _session.run()

    //cleanup
}

如果有人能帮我找出这个问题的解决方案，我会很感激。

I'd appreciate if anybody could help me figuring out the solution to this problem.

推荐答案

在每个分支上都有队列元素从发球台？一个用于文件，一个用于解码？你也可以尝试搞砸在文件链接上的sync属性。

Do you have queue elements on each branch that comes off the tee? One for the file and one for the decode? You could also try messing around with the "sync" property on the filesink. Maybe set it to true.

编辑者 Nawaz 。

由于这个答案首先给了我几个方向，几乎是一个非常接近解决方案

Since this answer first gave me few directions and almost a very-near-to-the-solution direction, it deserves the bounty I've set for this question. But before that, here is the solution (explanation is in my answer - Nawaz).

gst::element filesink("filesink", "file-sink");
filesink.set("async", gboolean(FALSE));

希望能帮助其他人。

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