I have uncovered the real potential of using command-line with VLC. I have some VERY dark footage from action camera and need to raise a gamma correction to get at least something from the footage. I have tried a lot of software and no one had so good results as when using gamma video filter in Tools->Extended settings in VLC. But this filter is just for viewing videos. It is not possible to use it in GUI when converting/streaming video. I was wondering how to convert/stream my footage with this "adjust gamma" filter. I spent a couple of hours reading VLC wiki documentation and found no solution. Then finally I found solution on completely another website. The solution is to use parameter 'vfilter' in 'transcode' module. The functional command prompt was:
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vlc VID_0002.MOV --sout="#transcode{vfilter=adjust{gamma=3.0},vcodec=theo,vb=2000, ... etc.etc.
I was googling the VLC documentation trying to find, where I overlooked the 'vfilter' parameter and haven't found it. Is the VLC documentation really missing something so important like the only way to apply audio/video filters to a stream or am I wrong?