H.264 GStreamer pipelines examples for non-VPU SoCs - Part 2 stream

2 minute read

This post shows some GStreamer pipelines examples for video streaming using H.264 on non-VPU boards.

If necessary, check the Part 1 post for more details.

For streaming configuration between two different boards and RTSP usage, please check this post.

Board to board

Video UDP stream

SERVER

gst-launch-1.0 -v filesrc location=<video_file> ! qtdemux ! queue ! rtph264pay ! udpsink host=<CLIENT_IP>

The CLIENT pipeline needs all the video udpsink caps values to reproduce the video. So using the -v property in the SERVER, find and copy the udpsink caps values, as in the image below: CLIENT

gst-launch-1.0 udpsrc caps = '<UDPSINK_CAPS>' ! rtpjitterbuffer latency=100 ! queue ! rtph264depay ! avdec_h264 ! autovideosink sync=false

The rtpjitterbuffer plugin is used to avoid high latency problem, using the latency property to ensure an uninterrupted data flow in the process.

Video RTSP stream

SERVER

test-uri file:///<video_file>

CLIENT

gst-launch-1.0 rtspsrc location=rtsp://<SERVER_IP>:8554/test ! queue ! rtpjitterbuffer latency=100 ! rtph264depay ! avdec_h264 ! autovideosink sync=false

Board to Linux PC

All these GStreamer pipelines were tested in the kernel BSP release 4.1.15-2.0.0 GA on an i.MX 6UltraLite EVK. The Linux host PC used was an Ubuntu 16.04 LTS with VLC media player 2.2.2 Weathermax version.

Video UDP stream

SERVER

gst-launch-1.0 -v filesrc location=<video_file> ! qtdemux ! rtph264pay ! udpsink host=<VLC_PC_IP> port=5000

CLIENT

In the Linux host PC, create a file called video.sdp with the following values and play it with the VLC media player:

v=0
m=video 5000 RTP/AVP 96
c=IN IP4 <SERVER_IP>
a=rtpmap:96 H264/90000
a=fmtp:96 sprop-parameter-sets=J01AHqkYGwe83gDUBAQG2wrXvfAQ=,KN4JyA=;

The parameter-sets value is just an example of how the udpsink caps must be copied and changed for .sdp files compatible string.

After entering the SERVER GStreamer pipeline, VLC allows to play the .sdp file during 10 seconds due to its configuration.

Video + audio UDP stream

SERVER

gst-launch-1.0 filesrc location=<video_file> ! qtdemux name=d d. ! queue ! rtph264pay name=pay0 pt=96 ! udpsink host=<SERVER_IP> port=5000 sync=false d. ! queue ! rtpmp4apay name=pay1 pt=98 ! udpsink host=<SERVER_IP> port=5004

CLIENT

In the Linux host PC, create a file called video_audio.sdp with the following values and play it with the VLC media player:

v=0
m=video 5000 RTP/AVP 96
c=IN IP4 <SERVER_IP>
a=rtpmap:96 H264/90000
a=fmtp:96 sprop-parameter-sets=J01AHqkYGwe83gDUBAQG2wrXvfAQ=,KN4JyA=;
m=audio 5004 RTP/AVP 98
a=rtpmap:98 MP4A-LATM/48000

The audio quality in this last example is not perfect, but it was the best I could get with the available time. Please, fell free to enchance it and if you get any better, please share your how-to in the comments.

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