The VideoLAN Forums

Posted: **08 Mar 2017 21:13**

I'm streaming a 1080p webcam from a Raspberry Pi 1. The stream coming from the webcam is already h264 encoded , so the pi is basically just a means of spewing data from the webcam to the network. Since the original pi is so limited in processing power, I'd prefer that it doesn't try to do any preprocessing of the stream. (And if there's a better way of doing this, please let me know.)

The command I'm using on the pi:

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/usr/bin/cvlc v4l2:///dev/video0:chroma=h264 --sout '#standard{access=http,mux=ts,dst=0.0.0.0:8080/stream.mp4}'

The client side is VLC 2.2.4 running on Windows Server 2012r2. I have 2x2 monitor grid which (unfortunately) consists of 4:3 screens. I want to crop the incoming 16:9 stream to 4:3. The resulting video should then be split up into . I've been able to crop the video to 4:3, or display it on the image wall, but not both at the same time.

Here's what I've tried so far. The result for all commands is a 2x2 monitor grid, but uncropped.

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"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" --video-splitter wall --wall-cols 2 --wall-rows 2 --wall-element-aspect 4:3 http://fatbot:8080/stream.mp4
"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" --video-splitter wall --wall-cols 2 --wall-rows 2 --crop 4:3 http://fatbot:8080/stream.mp4
"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" --video-splitter panoramix --panoramix-cols 2 --panoramix-rows 2 --no-panoramix-attenuate --crop 4:3 http://fatbot:8080/stream.mp4

This command results in an error, but I can't figure out what's wrong with it. VLC on Windows doesn't give meaningful error messages, so this is the result from VLC 2.2.4 on CentOS 7:

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$ vlc --video-splitter wall --wall-cols 2 --wall-rows 2 --video-filter croppadd --cropadd-cropright 240 --cropadd-cropleft 240 http://fatbot:8080/stream.mp4
VLC media player 2.2.4 Weatherwax (revision 2.2.3-37-g888b7e89)
vlc: unknown option or missing mandatory argument `--cropadd-cropright'
Try `vlc --help' for more information.

Any help would be appreciated.

Posted: **11 Mar 2017 15:05**

vlc: unknown option or missing mandatory argument `--cropadd-cropright'

be sure to distinquish from the correct spelling 'croppadd' and incorrect 'cropadd'.

Posted: **24 Mar 2017 21:28**

Fixed, thanks. Unfortunately, it still doesn't work:

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$ vlc --video-splitter wall --wall-cols 2 --wall-rows 2 --video-filter croppadd --croppadd-cropright 240 --croppadd-cropleft 240  http://fatbot:8080/stream.mp4
VLC media player 3.0.0-git Vetinari (revision 2.2.0-git-10582-g9eb9eb0bd2)
[0000560457a961c8] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
[00007f7048151398] core video output error: Failed to compensate for the format changes, removing all filters
[00007f7044003c18] core vout display error: Failed to change zoom
[00007f7044003c18] core vout display error: Failed to change source AR
[00007f7048151398] core video output error: Failed to compensate for the format changes, removing all filters

Posted: **25 Mar 2017 13:47**

try this also:

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--croppadd-croptop 0 --croppadd-cropbottom 0

The VideoLAN Forums

How do I crop a stream for an image wall?

How do I crop a stream for an image wall?

Re: How do I crop a stream for an image wall?

Re: How do I crop a stream for an image wall?

Re: How do I crop a stream for an image wall?