如何通过UDP从GStreamer 1.0到VLC传输视频


How to Stream Video over UDP from GStreamer 1.0 to VLC

我计划将GStreamer用作我的应用程序的新视频流库，但我尝试首先测试其基本功能。不幸的是，存在文档问题，尤其是关于：Windows和v1.x

我可以在GStreamer中播放本地视频文件。我可以在VStream通过UDP或RTP流式传输的GStreamer中播放视频。我可以将videotestsrc从GStreamer流式传输到VLC。

我无法将本地保存的视频从GStreamer流式传输到VLC。我怎么做？

视频格式.mp4

VLC版本3.0.4

Gstreamer版本1.16

(一些)经过测试的命令

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gst-launch-1.0 filesrc location=C:/Users/me/Desktop/big_buck_bunny.mp4 ! queue ! udpsink port=1234
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New clock: GstSystemClock
Got EOS from element"pipeline0".
Execution ended after 0:00:00.027096112
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gst-launch-1.0 filesrc location=C:/Users/me/Desktop/big_buck_bunny.mp4 ! decodebin ! x264enc ! rtph264pay ! udpsink port=1234
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New clock: GstSystemClock
Got EOS from element"pipeline0".
Execution ended after 0:00:00.027096112

以前的命令没有明显错误，但VLC却什么也没收到，而Wireshark却什么也没看到

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gst-launch-1.0 -v filesrc location=C:/Users/me/Desktop/big_buck_bunny.mp4 ! decodebin ! x264enc ! rtph264pay ! udpsink port=1234

很多行，关于上限格式的信息很多。

垃圾箱输出。

我尝试了很多大写字母组合，但到目前为止没有任何效果。我尝试过的一个：

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gst-launch-1.0 -v filesrc location=C:/Users/1137824/Desktop/big_buck_bunny.mp4 ! videoconvert ! videoscale ! video/x-raw,width=800,height=600 ! avenc_mpeg4 ! rtpmp4vpay config-interval=3 ! udpsink port=1234
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Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal data stream error.
Additional debug info:
../libs/gst/base/gstbasesrc.c(3072): gst_base_src_loop (): /GstPipeline:pipeline0/GstFileSrc:filesrc0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.

尝试从VLC到Gstreamer到VLC进行流传输(可能是GStreamer正在将整个视频发送到一个数据包中，而不是逐帧发送)

gst-launch-1.0 udpsrc port=1234 ! rtph264pay ! udpsink port=1212

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ERROR: from element /GstPipeline:pipeline0/GstRtpH264Pay:rtph264pay0: GStreamer error: negotiation problem.
Additional debug info:
../gst-libs/gst/rtp/gstrtpbasepayload.c(714): gst_rtp_base_payload_chain (): /GstPipeline:pipeline0/GstRtpH264Pay:rtph264pay0:
No input format was negotiated, i.e. no caps event was received. Perhaps you need a parser or typefind element before the payloader

gst-launch-1.0 udpsrc port=1234 ! videoconvert ! x264enc ! rtph264pay ! udpsink port=1212

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ERROR: from element /GstPipeline:pipeline0/GstUDPSrc:udpsrc0: Internal data stream error.
Additional debug info:
../libs/gst/base/gstbasesrc.c(3072): gst_base_src_loop (): /GstPipeline:pipeline0/GstUDPSrc:udpsrc0:
streaming stopped, reason not-negotiated (-4)

要能够从VLC接收，您需要从rtph264pay元素传输配置。这是通过元素的config-interval值完成的。例如：

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gst-launch-1.0 filesrc location=C:/Users/me/Desktop/big_buck_bunny.mp4 ! decodebin ! x264enc ! rtph264pay config-interval=1 pt=96 ! udpsink port=1234

对于接收方。 VLC需要.sdp文件来描述网络流。您可以使用文本编辑器创建一个简单的文本文件，然后将内容写入文件中。一个示例sdp文件将如下所示：

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v=0
m=video 1234 RTP/AVP 96
c=IN IP4 127.0.0.1
a=rtpmap:96 H264/90000

在这里，向VLC描述您将从端口1234接收H264视频流，并且该视频流位于有效载荷为96的RTP数据包中。您告诉它从IP4 == 127.0.0.1进行侦听。

随时根据您的需要进行修改。

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