这个GStreamer管道有什么问题? [英] What's wrong with this GStreamer pipeline?

问题描述

我确定我已经在我设置的早期Ubuntu系统(为提高可读性而格式化)上运行了该管道:

I'm sure I've had this pipeline working on an earlier Ubuntu system I had set up (formatted for readability):

playbin
    uri=rtspt://user:[e-mail]/ch1/main
    video-sink='videoconvert
                ! videoflip method=counterclockwise
                ! fpsdisplaysink'

但是，当我尝试在程序中使用它时，我得到了:

Yet, when I try to use it within my program, I get:

Missing element: H.264 (Main Profile) decoder
WARNING: from element /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0:
    No decoder available for type 'video/x-h264,
    stream-format=(string)avc, alignment=(string)au,
    codec_data=(buffer)014d001fffe10017674d001f9a6602802dff35010101400000fa000030d40101000468ee3c80,
    level=(string)3.1, profile=(string)main, width=(int)1280,
    height=(int)720, framerate=(fraction)0/1, parsed=(boolean)true'.

Additional debug info:
    gsturidecodebin.c(938): unknown_type_cb ():
        /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0

现在我可以确定我已经安装了H264解码器，并且确实gstreamer插件autogen.sh/configure可以正确识别这一事实.已安装的软件包为h264enc，libx264-142，libx264-dev和x264.

Now I'm pretty certain I have an H264 decoder installed and indeed the gstreamer plugins autogen.sh/configure correctly recognised the fact. Installed packages are h264enc, libx264-142, libx264-dev and x264.

如果我使用更可接受的" autovideosink代替fpsdisplaysink，或者尝试使用gst-play-1.0播放RTSP流，则它的作用完全相同.但是，如果我使用测试模式源videotestsrc，它就可以工作.

It does exactly the same thing if I use the more "acceptable" autovideosink in place of fpsdisplaysink, or if I try to play the RTSP stream with gst-play-1.0. However, it works if I use the test pattern source videotestsrc.

我在做什么错了?

推荐答案

看来gstreamer找不到适合的解码H264的插件.您未安装H264解码器元素，或者gstreamer在寻找错误的元素路径.

It looks like gstreamer cannot find a suitable plugin for decoding H264. Either you do not have an H264 decoder element installed, or gstreamer is looking in the wrong path for your elements.

首先，尝试运行gst-inspect-1.0.这将输出一长串gstreamer检测到的所有元素的列表.

First, try running gst-inspect-1.0. This should output a long list of all the elements gstreamer has detected.

• 如果不返回任何元素，则可能需要设置GST_PLUGIN_PATH环境变量以指向插件安装目录. 正在运行Gstreamer -此链接应该会有所帮助.
• 如果确实返回许多元素，请运行gst-inspect-1.0 avdec_h264来验证您是否具有H264解码器元素.

• If this doesn't return any elements, you probably need to set the GST_PLUGIN_PATH environment variable to point to the directory where your plugins are installed. Running Gstreamer - This link should help.
• If it DOES return many elements, run gst-inspect-1.0 avdec_h264 to verify that you have the H264 decoder element.

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