The VideoLAN Forums

Posted: **01 Mar 2017 15:33**

I manually set up vlc to work with a webcam (Ausdom HD 1080p USB2) from menu:
Media > Open_Capture_Device > Advanced_options
Shortly, just setting correct device /dev/video1 and video input chroma format to MJPG gets it working good when PLAYed.

Then I copy to clipboard active advanced options from:
Media > Open_Capture_Device > Show_more_options > Edit_options

I then try to start vlc in (Linux) command line by:

Code: Select all

vlc v4l2:///dev/video1 ":v4l2-standard= :v4l2-dev=/dev/video1 :v4l2-vbidev= :v4l2-chroma=MJPG :v4l2-input=0 :v4l2-audio-input=-1 :v4l2-width=1920 :v4l2-height=1080 :v4l2-aspect-ratio=16\:9 :v4l2-fps=30 :v4l2-radio-dev=/dev/radio0 :v4l2-tuner-frequency=-1 :v4l2-tuner-audio-mode=3 :no-v4l2-controls-reset :v4l2-brightness=-1 :v4l2-brightness-auto=-1 :v4l2-contrast=-1 :v4l2-saturation=-1 :v4l2-hue=-1 :v4l2-hue-auto=-1 :v4l2-white-balance-temperature=-1 :v4l2-auto-white-balance=-1 :v4l2-red-balance=-1 :v4l2-blue-balance=-1 :v4l2-gamma=-1 :v4l2-autogain=-1 :v4l2-gain=-1 :v4l2-sharpness=-1 :v4l2-chroma-gain=-1 :v4l2-chroma-gain-auto=-1 :v4l2-power-line-frequency=-1 :v4l2-backlight-compensation=-1 :v4l2-band-stop-filter=-1 :no-v4l2-hflip :no-v4l2-vflip :v4l2-rotate=-1 :v4l2-color-killer=-1 :v4l2-color-effect=-1 :v4l2-audio-volume=-1 :v4l2-audio-balance=-1 :no-v4l2-audio-mute :v4l2-audio-bass=-1 :v4l2-audio-treble=-1 :no-v4l2-audio-loudness :v4l2-set-ctrls= :live-caching=300"

But it does not obey those settings, but opens up the web camera using video input chorma format YUY2 and not the given MJPG.

Version:
VLC media player 2.2.4 Weatherwax (revision 2.2.3-37-g888b7e89)

Why vlc does not work as intended? Is this a known bug?

Posted: **01 Mar 2017 18:22**

You are not setting the v4l2-chroma parameter - quoting is wrong.

Posted: **01 Mar 2017 19:03**

I tried without the quotes before,
BUT... the problem before was that v24l:///dev/video1 parameter was after the options. When I moved it front (and removed the quotes), it worked as intended and choma-format was MJPG. In the original question I already had moved the stream parameter to the front but not tried without quotes.

thanks.

Should have read manual also. Was misinterpreting those

ptions. It makes sense now.

Code: Select all

$ man vlc
...
   :option  An option that only applies to the stream directly before it
            and that overrides previous settings.
...

The VideoLAN Forums

[SOLVED] vlc does not obey advanced settings (video chroma format) given in command line?

[SOLVED] vlc does not obey advanced settings (video chroma format) given in command line?

Re: vlc does not obey advanced settings (video chroma format) given in command line?

Re: vlc does not obey advanced settings (video chroma format) given in command line?