commands.md

Additional Gstreamer commands

1. GStreamer command-line cheat sheet
2. Gstreamer cheat sheet (Wiki)

List video cameras (Ubuntu)

ls -ltrh /dev/video*

> crw-rw----+ 1 root video 81, 1 sep 20 08:43 /dev/video1
> crw-rw----+ 1 root video 81, 0 sep 20 08:43 /dev/video0

Check video camera format (Ubuntu)

apt install v4l-utils

v4l2-ctl -d /dev/video0 --list-formats-ext

Mixing

• How to mix two test streams (videobox, videomixer)

  gst-launch-1.0 videomixer name=mixer ! gtksink \
  videotestsrc ! videoscale ! video/x-raw,width=960,height=540 ! \
  tee name=t !  queue ! videoconvert ! videobox left=-960 ! videoconvert ! mixer. \
  t. ! queue ! videobox left=0  ! videoconvert ! mixer.
  

Join multiple video parts in one video

gst-launch-1.0 splitmuxsrc location=video*.mp4 ! h264parse ! mp4mux ! filesink location=out.mp4

Using FFMPEG

ffmpeg -f concat -safe 0 -i <(for f in ./*.mp4; do echo "file '$PWD/$f'"; done) -c copy all.mp4

Splitting

• Split single video into 60 sec pieces:

  gst-launch-1.0 filesrc location=video.mp4 ! qtdemux ! h264parse ! splitmuxsink max-size-time=60000000000 location=piece%02d.mp4
  

Networking

TCP

Test stream (videotestsrc)

• send

  gst-launch-1.0 videotestsrc ! videoscale ! video/x-raw,width=100,height=100 ! \
  x264enc tune="zerolatency" ! mpegtsmux ! tcpserversink host=127.0.0.1 port=5000
  

• receive

  gst-launch-1.0 tcpclientsrc port=5000 host=127.0.0.1 ! tsdemux ! \
  h264parse ! avdec_h264 ! videoconvert ! gtksink
  

From webcamera (v4l2src)

• send

  gst-launch-1.0 v4l2src ! jpegenc ! tcpserversink host=localhost port=5000
  

• receive

  gst-launch-1.0 tcpclientsrc port=5000 ! jpegdec ! videoconvert ! autovideosink sync=true
  

Video Record

From webcam

gst-launch-1.0 v4l2src ! videoconvert ! x264enc tune=zerolatency pass=quant !  h264parse ! mp4mux ! filesink location=video.mp4 -e

RTSP

Recording video to multiple files (duration 1 minute)

gst-launch-1.0 rtspsrc location=rtsp://... drop-on-latency=true latency=0 ! \
rtph264depay ! h264parse ! splitmuxsink location=video%02d.mp4 max-size-time=60000000000

FPS measurements

RTSP

gst-launch-1.0 -v rtspsrc location=rtsp://... drop-on-latency=true latency=0 ! \
decodebin ! videoconvert ! video/x-raw,format=RGB ! videoconvert ! \
fpsdisplaysink video-sink=fakesink signal-fps-measurements=True

Jetson

gst-launch-1.0 filesrc location=video.mp4 ! qtdemux name=demux1 demux1.video_0 ! \
queue ! h264parse ! omxh264dec ! fpsdisplaysink video-sink=fakesink signal-fps-measurements=True

Format Conversion

H264 -> RGBA

Jetson

 gst-launch-1.0 -v -e filesrc location=video2560.mp4 ! qtdemux name=demux1 demux1.video_0 ! queue ! \
 h264parse ! omxh264dec ! nvvidconv ! video/x-raw,format=RGBA ! \ 
 fpsdisplaysink video-sink=fakesink signal-fps-measurements=True

MPEG -> MP4

 gst-launch-1.0 filesrc location=video.mpeg ! mpegpsdemux ! h264parse ! mp4mux ! filesink location=video.mp4 sync=False -e

Take snapshot

RTSP

 gst-launch-1.0 -v rtspsrc location=... drop-on-latency=true latency=0 num-buffers=1 ! \
 decodebin  !  videoconvert ! jpegenc ! multifilesink location=img101.jpg

Video Processing

Change Width/Height (Using videoscale plugin)

• scales video to Full HD (1920x1080)

  gst-launch-1.0  filesrc location=video.mp4 ! decodebin ! videoconvert ! videoscale ! \
  video/x-raw,width=1920,height=1080 ! videoconvert ! \
  x264enc tune=zerolatency bitrate=16384 ! filesink location=video.mp4 -e
  

Change FPS of video (Using videorate plugin)

• making video with 15 FPS

  gst-launch-1.0  filesrc location=video.mp4 ! decodebin ! videoconvert ! \ 
  videorate ! video/x-raw,framerate=15/1 ! videoconvert ! \
  x264enc tune=zerolatency bitrate=16384 ! filesink location=video.mp4
  

Streaming from Youtube

gst-launch-1.0 souphttpsrc is-live=true location="$(youtube-dl -f mp4 -g https://www.youtube.com/watch?v=xjDjIWPwcPU)" \
! decodebin ! videoconvert ! gtksink sync=false

Note:

• youtube-dl allows to get HTTPS URL for youtube video link.

Splitting/Sharing pipeline