MrGlasspoole
Posts: 9
Joined: Sat Dec 09, 2017 12:24 am

h264 and the lag

Sat Dec 09, 2017 2:01 am

I'm trying to build a cam that i can view on my satellite receiver.
There is a plugin but it does not work with mjpeg.

Everything h264 i tried does not work that it is usable - the lag is horrible.

I tried this tutorial: https://chriscarey.com/blog/2017/04/30/ ... ra-system/

The i tried uv4l with:

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~# uv4l --driver raspicam --auto-video_nr --framerate 25 --extension-presence=0
~# cvlc -vvv v4l2c:///dev/video0:width=1640:height=1232:chroma=H264 --sout '#rtp{access=udp,sdp=rtsp://:8554/}' --demux h264
and showing it in VLC

Then i found: https://www.youtube.com/watch?v=JVGi8-ghO10
What i don't understand why he is using

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uv4l --driver raspicam --auto-video_nr --width 640 --height 480 --encoding h264
but then he shows a mjpeg stream.

You can call:

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http://10.1.255.7:8080/stream
http://10.1.255.7:8080/stream/video.h264
http://10.1.255.7:8080/stream/video.mjpeg
http://10.1.255.7:8080/stream/video.jpeg
they all give me just mjpeg - even if i set h264 on the "Camera Control Panel" page.

Is WebRTC the only way to have none slow and lagging h264?
There are so many cheap CAMs you can buy - how do they do it with less CPU/GPU power then a Raspberry?

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 23393
Joined: Sat Jul 30, 2011 7:41 pm

Re: h264 and the lag

Sat Dec 09, 2017 9:12 am

H264 should be fine, it's quicker than mjpeg as its lower bandwidth. So its a setup problem I suspect.

I presume you are attempting to stream from Pi camera over Ethernet to some playback device?
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
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MrGlasspoole
Posts: 9
Joined: Sat Dec 09, 2017 12:24 am

Re: h264 and the lag

Sat Dec 09, 2017 10:00 am

I need rtps for my satellite receiver.

I don't know what I'm doing wrong with UV4L but i tried now GStreamer to GStreamer on Windows and the lag seems to be Ok.

Pi:

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~# raspivid -n -t 0 -w 1640 -h 1232 -fps 25 -b 4000000 -vf -hf -a 4 -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! tcpserversink host=10.1.255.7 port=5000

Windows CMD:

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gst-launch-1.0.exe -v tcpclientsrc host=10.1.255.7 port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=true

But i can't figure out how to get rtps running with GStreamer.
I found this: https://www.youtube.com/watch?v=ThNJGRzjWS8
So what i did:

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~# gst-inspect-1.0 --version
~# wget https://gstreamer.freedesktop.org/src/gst-rtsp-server/gst-rtsp-server-1.10.4.tar.xz
~# tar xf gst-rtsp-server-1.10.4.tar.xz
~# cd /home/pi/gst-rtsp-server-1.10.4/examples
~# chmod +x test-launch.c
~# ./test-launch.c "v4l2src device=/dev/video0 ! video/x-raw, format=(yuyv), framerate=15/1, width=320, height=240 ! queue ! omxh264enc ! video/x-h264, profile=(string)high ! rtph264pay name=pay0 config-interval=1 pt=96"

If i try to start the example (test-launch.c) i get:

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./test-launch.c: line 1: /bin: Is a directory
./test-launch.c: line 2: syntax error near unexpected token `('
./test-launch.c: line 2: ` * Copyright (C) 2008 Wim Taymans <wim.taymans at gmail.com>'

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 23393
Joined: Sat Jul 30, 2011 7:41 pm

Re: h264 and the lag

Sat Dec 09, 2017 11:10 am

running test_launch.c doesn't look right at all.
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MrGlasspoole
Posts: 9
Joined: Sat Dec 09, 2017 12:24 am

Re: h264 and the lag

Sat Dec 09, 2017 11:36 am

These are all 'c' files.
I also downloaded v1.4.4 what the guy in the video used and it's the same.
This files are not compiled? But why does it work in that youtube video?

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 23393
Joined: Sat Jul 30, 2011 7:41 pm

Re: h264 and the lag

Sat Dec 09, 2017 1:28 pm

Can you post a link to these C files? You don't run the .c files directly, they need to be compiled.
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MrGlasspoole
Posts: 9
Joined: Sat Dec 09, 2017 12:24 am

Re: h264 and the lag

Thu Dec 14, 2017 3:41 am

Ok, did some more testing.
TCP gives me 800 and UDP 300 ms lag with GStreamer to GStreamer.

I really need help to figure out how to make a rtps stream with GStreamer that i can use on my NVR.

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