RTSP (Real Time Streaming Protocol)，实时流协定，是一种应用层协定，专为流媒体应用。本文将介绍 GStreamer, VLC, FFmpeg 这几个工具，如何发送、接管 RTSP 流。
前提
- Ubuntu 18.04 LTS (Bionic Beaver)
GStreamer
装置：
sudo apt install libgstreamer1.0-0 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio查看所有插件：
# conda deactivategst-inspect-1.0 -a播放 ~/Videos/test.mp4 文件：
gst-launch-1.0 filesrc location=~/Videos/test.mp4 ! decodebin ! autovideosink播放 /dev/video0 webcam：
gst-launch-1.0 v4l2src device=/dev/video0 \! video/x-raw, format=YUY2, width=640, height=480, framerate=30/1 \! autovideosink/dev/video0 相干信息，可见后文“对于 Webcam”。
GStreamer RTSP Server
编译 test-launch 例子：
sudo apt install libgstreamer1.0-dev libgstrtspserver-1.0git clone https://github.com/GStreamer/gst-rtsp-server.gitcd gst-rtsp-server/git checkout 1.18cd examples/gcc test-launch.c -o test-launch $(pkg-config --cflags --libs gstreamer-rtsp-server-1.0)用 test-launch 发送 RTSP 测试流：
$ ./test-launch "videotestsrc ! x264enc ! rtph264pay name=pay0 pt=96"stream ready at rtsp://127.0.0.1:8554/test用 gst-launch 接管 RTSP 测试流：
gst-launch-1.0 playbin uri=rtsp://127.0.0.1:8554/test发送 RTSP，以 test-launch
发送 ~/Videos/test.mp4 文件:
./test-launch "filesrc location=/home/john/Videos/test.mp4 ! decodebin ! x264enc ! rtph264pay name=pay0 pt=96"发送 /dev/video0 webcam：
./test-launch "v4l2src device=/dev/video0 ! video/x-raw,format=YUY2,width=640,height=480 ! videoconvert ! x264enc ! rtph264pay name=pay0 pt=96"接管 RTSP，以 gst-launch
gst-launch-1.0 playbin uri=rtsp://127.0.0.1:8554/test# orgst-launch-1.0 rtspsrc location=rtsp://127.0.0.1:8554/test ! decodebin ! autovideosink参考
GStreamer
- Installing on Linux
- Command line tools
- Plugins
- GStreamer RTSP Server
- Stream webcam with GStreamer (RTSP)
- x264 error: baseline profile doesn't support 4:2:2
VLC
装置：
sudo snap install vlc# allow camera permissionsnap connect vlc:camera :camera查看可用模块：
vlc --list播放 ~/Videos/test.mp4 文件：
vlc file:///home/john/Videos/test.mp4播放 /dev/video0 webcam：
vlc v4l2:///dev/video0:chroma=mjpg:width=640:height=480:fps=30发送 RTSP，以 vlc
发送 ~/Videos/test.mp4 文件：
vlc file:///home/john/Videos/test.mp4 \--sout '#transcode{vcodec=h264}:rtp{sdp=rtsp://:8554/test}'发送 /dev/video0 webcam：
vlc v4l2:///dev/video0:chroma=yuyv:width=640:height=480:fps=30 \--sout '#transcode{vcodec=h264,width=640,height=480}:rtp{sdp=rtsp://:8554/test}'接管 RTSP，以 vlc
vlc rtsp://127.0.0.1:8554/test参考
VLC
- Modules/file
- Modules/v4l2
- Streaming HowTo/Advanced Streaming Using the Command Line
- Streaming HowTo/Command Line Examples
- Ubuntu 18.04 Webcam streaming problem
FFmpeg
装置：
sudo apt install ffmpeg发送 RTSP，以 ffserver
配置 ffserver.conf：
HTTPPort 8091HTTPBindAddress 0.0.0.0RTSPPort 1554MaxHTTPConnections 2000MaxClients 1000MaxBandwidth 1000CustomLog -<Stream test.mp4> File "/home/john/Videos/test.mp4" Format rtp</Stream>开启 ffserver：
$ nohup ffserver -f ffserver.conf &$ tail nohup.out libavcodec 57.107.100 / 57.107.100 libavformat 57. 83.100 / 57. 83.100 libavdevice 57. 10.100 / 57. 10.100 libavfilter 6.107.100 / 6.107.100 libavresample 3. 7. 0 / 3. 7. 0 libswscale 4. 8.100 / 4. 8.100 libswresample 2. 9.100 / 2. 9.100 libpostproc 54. 7.100 / 54. 7.100Wed Apr 21 11:28:39 2021 Opening feed file '/home/john/Videos/test.mp4' for stream 'test.mp4'Wed Apr 21 11:28:39 2021 FFserver started.接管 RTSP，以 ffplay
ffplay rtsp://127.0.0.1:1554/test.mp4参考
FFmpeg
- ffserver
- Streaming RTSP with ffmpeg?
- Run real time streaming with ffserver?
对于 Media
$ sudo apt install ffmpeg$ ffprobe ~/Videos/test.mp4ffprobe version 3.4.8-0ubuntu0.2 Copyright (c) 2007-2020 the FFmpeg developers built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04) configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared libavutil 55. 78.100 / 55. 78.100 libavcodec 57.107.100 / 57.107.100 libavformat 57. 83.100 / 57. 83.100 libavdevice 57. 10.100 / 57. 10.100 libavfilter 6.107.100 / 6.107.100 libavresample 3. 7. 0 / 3. 7. 0 libswscale 4. 8.100 / 4. 8.100 libswresample 2. 9.100 / 2. 9.100 libpostproc 54. 7.100 / 54. 7.100Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/john/Videos/test.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.20.100 Duration: 00:10:22.04, start: 0.000000, bitrate: 4205 kb/s Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080, 4204 kb/s, 25 fps, 25 tbr, 1200k tbn, 2400k tbc (default) Metadata: handler_name : VideoHandler- ffprobe
对于 Webcam
$ sudo apt install v4l-utils$ v4l2-ctl --list-devicesHD Webcam: HD Webcam (usb-0000:00:14.0-13): /dev/video0 /dev/video1$ v4l2-ctl -d 0 --list-formats-extioctl: VIDIOC_ENUM_FMT Index : 0 Type : Video Capture Pixel Format: 'MJPG' (compressed) Name : Motion-JPEG Size: Discrete 640x480 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 1280x720 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 640x360 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 352x288 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 320x240 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 176x144 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 160x120 Interval: Discrete 0.033s (30.000 fps) Index : 1 Type : Video Capture Pixel Format: 'YUYV' Name : YUYV 4:2:2 Size: Discrete 640x480 Interval: Discrete 0.033s (30.000 fps) Interval: Discrete 0.050s (20.000 fps) Size: Discrete 1280x720 Interval: Discrete 0.100s (10.000 fps) Size: Discrete 640x360 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 352x288 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 320x240 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 176x144 Interval: Discrete 0.033s (30.000 fps) Size: Discrete 160x120 Interval: Discrete 0.033s (30.000 fps)GoCoding 集体实际的教训分享，可关注公众号！