Video Lan Client (VLC) Use
HDR Too Dark
The default tone mapping for HDR “Hable” is too dark, tried “Reinhard”:
Preferences -> All -> Video -> Output modules -> OpenGL -> Tone mapping -> Tone-mapping algorithm = Reinhard (simple non-linear)
Did not really work for me.
Multi Channel Audio Output
Preferences -> Audio
All effects are off.
In Windows
Setting | Value |
---|---|
Output module | Windows Multimedia Device output |
HDMI/SPDIF audio passthrough | Enabled |
Device | Receiver |
In Linux
Setting | Value |
---|---|
Output module | Alsa |
Device | Pick the one that works. |
In MacOS
Does not seem to be supported?
Video Capture
Identify the resolution and formats supported by the webcam:
> v4l2-ctl --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture
[0]: 'MJPG' (Motion-JPEG, compressed)
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 848x480
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 960x540
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.033s (30.000 fps)
[1]: 'YUYV' (YUYV 4:2:2)
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 424x240
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 320x240
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 320x180
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 160x120
Interval: Discrete 0.033s (30.000 fps)
Based on the above, one arrives at MJPG, 1280x720, as the best format for video capture.
To display webcam in the default format:
vlc v4l2:///dev/video0
Specify the video capture format and metadata on the command line:
vlc --meta-title='Live Feed' \
--meta-description='Straight from my desk' \
'v4l2:///dev/video4:width=1920:height=1080:fps=15:chroma=H264:stereo=disabled:samplerate:44100'
RTSP Support
vlc in some distros is packed without RTSP support due to a license issue.
Use snap instead:
sudo apt purge -y vlc
snap install vlc
Video Streaming
RTP Multicast Live Streaming
Capture, transcode the video and send it to a multicast IP address with the associated SAP announce:
cvlc --meta-title='Live Feed' \
--meta-description='Straight from my desk' \
--live-caching 300 \
'v4l2:///dev/video4:width=1280:height=720:fps=15:chroma=H264:stereo=disabled:samplerate:44100' \
--sout '#transcode{vcodec=h264,vb=6000,acodec=mp4a,aenc=fdkaac,ab=256}:rtp{mux=ts,dst=239.255.12.42,sdp=sap,name=Test}'
To view the stream:
vlc rtp://239.255.12.42
RTSP Live Streaming
cvlc --meta-title='Live Feed' \
--meta-description='Straight from my desk' \
--live-caching 300 \
'v4l2:///dev/video4:width=1280:height=720:fps=15:chroma=H264:stereo=disabled:samplerate:44100' \
--sout '#transcode{vcodec=h264,vb=6000,acodec=mp4a,aenc=fdkaac,ab=256}:rtp{dst=127.0.0.1,port=1234,sdp=rtsp://localhost:554/test.sdp}'
To view the stream:
vlc rtsp://localhost:554/test.sdp
Mosaic of RTSP streams
From here:
Create mosaic_vlc3.vlm and then:
vlc.exe --vlm-conf mosaic_vlc3.vlm