Gstreamer学习流水账

Gstreamer是Linux上的一套多媒体框架，集采集，编码，解码，渲染，滤镜等功能一条龙的媒体解决方案,它的调度能力和扩展能力非常出色，被广泛应用在各种多媒体方案上，这里总结一些学习记录和心得，采用编年体，比较自由，到最后肯定会是一篇流水账。

1.查看系统安装了哪些插件

czl@czl-VirtualBox:~/WorkSpace$ gst-inspect-1.0 |grep -i videosink
inter:  intervideosink: Internal video sink
autodetect:  autovideosink: Auto video sink
decklink:  decklinkvideosink: Decklink Video Sink
debugutilsbad:  fpsdisplaysink: Measure and show framerate on videosink
debugutilsbad:  fakevideosink: Fake Video Sink
cluttergst3:  clutterautovideosink: Generic binczl@czl-VirtualBox:~/WorkSpace$ gst-inspect-1.0 |grep -i v4l
video4linux2:  v4l2src: Video (video4linux2) Source
video4linux2:  v4l2sink: Video (video4linux2) Sink
video4linux2:  v4l2radio: Radio (video4linux2) Tuner
video4linux2:  v4l2deviceprovider (GstDeviceProviderFactory)
czl@czl-VirtualBox:~/WorkSpace$

caozilong@caozilong-Vostro-3268:~/Workspace/camera$ v4l2-ctl --list-devices
Integrated Camera: Integrated C (usb-0000:00:14.0-2):/dev/video0/dev/video1caozilong@caozilong-Vostro-3268:~/Workspace/camera$

V4L2 plugin注册：

gstv4l2videodec.c启动解码任务：

最终是调用gst-base包中的gst_video_decoder_xxx plugin进行解码的。

V4L2设备打开：

2.videoconvert组件的作用，当不加入videoconvert组件时,以下两个命令会出错：

gst-launch-1.0 filesrc location=./test.mp4  ! decodebin  ! ximagesink
gst-launch-1.0 filesrc location=./test.mp4  ! decodebin  ! xvimagesink

czl@czl-VirtualBox:~/WorkSpace/ffserver$ gst-launch-1.0 filesrc location=./test.mp4  ! decodebin  ! ximagesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
Redistribute latency...
ERROR: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0: Internal data stream error.
Additional debug info:
qtdemux.c(6073): gst_qtdemux_loop (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
czl@czl-VirtualBox:~/WorkSpace/ffserver$ gst-launch-1.0 filesrc location=./test.mp4  ! decodebin  ! xvimagesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
Redistribute latency...
ERROR: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0: Internal data stream error.
Additional debug info:
qtdemux.c(6073): gst_qtdemux_loop (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
czl@czl-VirtualBox:~/WorkSpace/ffserver$

但是，加入videoconvert后，命令正确执行：

gst-launch-1.0 filesrc location=./test.mp4  ! decodebin ! videoconvert ! ximagesink
gst-launch-1.0 filesrc location=./test.mp4  ! decodebin ! videoconvert ! xvimagesink

3.gst audio sink test

gst-launch-1.0 audiotestsrc ! pulsesink

czl@czl-RedmiBook-14:~$ gst-inspect-1.0 pulseaudio
Plugin Details:Name                     pulseaudioDescription              PulseAudio plugin libraryFilename                 /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstpulseaudio.soVersion                  1.14.5License                  LGPLSource module            gst-plugins-goodSource release date      2019-05-29Binary package           GStreamer Good Plugins (Ubuntu)Origin URL               https://launchpad.net/distros/ubuntu/+source/gst-plugins-good1.0pulsedeviceprovider: PulseAudio Device Providerpulsesrc: PulseAudio Audio Sourcepulsesink: PulseAudio Audio Sink3 features:+-- 2 elements+-- 1 device providersczl@czl-RedmiBook-14:~$

结束！

Gstreamer学习流水账相关推荐

gstreamer学习笔记---编码videoencoder
既上一节的<gstreamer学习笔记-v4l2src>之后,我们这一次,学习gstreamer的编码流程.稍微了解gstreamer的小伙伴都知道,gstreamer具备强大的音视频 ...
gstreamer学习笔记---v4l2src
v4l2src element源码位于gst-plugins-good-xxx/sys/v4l2/gstv4l2src.c,v4l2src主要是从v4l2设备获取视频数据的element,基于v4 ...
gstreamer学习笔记：将音视频合成MPEG2-TS流并打包通过rtp传输
一.通过rtpbin插件发送 (1)发送端 gst-launch -v gstrtpbin name=rtpbin latency=100 mpegtsmux name="mux" ...
【GStreamer学习】之GStreamer基础教程
目标没有什么比在屏幕上打印出"Hello World"更能获得对软件库的第一印象了! 但是由于我们正在学习多媒体框架,所以我们将输出"Hello World!" ...
GStreamer学习笔记
目录前言一.GStreamer编程接口介绍二.gst-launch-1.0工具使用总结前言 GStreamer 是用来构建流媒体应用的开源多媒体框架(framework),其目标是要简化音/ ...
gstreamer学习（一） gstreamer-rtsp-server环境安装
gstreamer-rtsp-server环境安装(Linux环境下) 两种方式: 第一种方式,通过官网安装(如果是Linux环境,可以直接通过软件包工具进行安装),点击进入官网下载. 第二种方式,手 ...
Gstreamer学习笔记（4）：pad定义、连接、流动
pad相当于element的接口,各个element就是通过pad连接进行传输数据,同时pad会通过caps限制特定的数据类型通过,只有当两个pad的caps数据类型一致时才可以建立连接.那么pad在 ...
gstreamer学习笔记---pad定义、连接、流动
pad相当于element的接口,各个element就是通过pad连接进行传输数据,同时pad会通过caps限制特定的数据类型通过,只有当两个pad的caps数据类型一致时才可以建立连接.那么pa ...
gstreamer学习笔记---demux使用
在使用gstreamer的过程中,相信很多是都通过gst-launch-1.0直接使用playbin或者自建pipeline完成相应的播放测试,反而很少的会自己编写代码,其实,gst-launch ...

Gstreamer学习流水账

结束！

Gstreamer学习流水账相关推荐

最新文章

热门文章