# Mixer/Scene Parameters Mixer/Scene Parameters are viewer side options. You can add them to guest's URLs in rooms and scene URLs. ## **Room and Scene options** You have to add them to [`&scene`](/advanced-settings/mixer-scene-parameters/scene.md) or [`&room`](/advanced-settings/setup-parameters/room.md) or [`&view`](/advanced-settings/mixer-scene-parameters/view.md) URLs to change the behaviour of the Video Mixer.

Parameter	Explanation
`&solo`	Similar to `&scene`, but tells the system to be a solo-link
`&view`	Defines the stream(s) you are receiving, by their stream IDs
`&include`	Includes streams that do not exist in the room
`&exclude`	Same concept as `&view`, except does the opposite
`&layout`	Shows the guest a return feed of the current mixer layout when using the Mixer App
`&activespeaker`	Auto-hides remote guests videos when added, if those guests are not speaking actively
`&order`	The order priority of a source video when added to the video mixer
`&slots`	Will force the auto-mixer to have that number of slots, even if there are more or less videos available to fill them
`&fakeguests`	Creates simulated guest videos
`&randomize`	Random video loading order
`&cover`	Has the videos fully "cover" their assigned areas, even if it means cropping the video
`&43`	Optimizes the video mixer for 4:3 videos
`&portrait`	Optimizes the video mixer for 9:16 videos
`&square`	Optimizes the video mixer for 1:1 videos
`&forceviewerlandscape`*	Keeps all incoming videos oriented (rotated) so that the aspect ratio is always above 1
`&animated`	Videos in a group scene will slide around the screen when being re-arranged
`&manual`	Disables the auto-mixer, allowing for a custom mixer to be used
`&locked`	Will force a the VDO.Ninja's mixer output keep the mixed render contained to a specific aspect-ratio, regardless of the browser's window size
`&poster`	Lets you specify a poster image for videos that have not yet started playing
`&hideplaybutton`	Will hide the default big play button that overlays a video when auto play is not allowed
`&motiondetection`*	Does a few things when it detects motion in a video

\*NEW IN VERSION 24 ## **Only Scene options** You have to add them to [`&scene`](/advanced-settings/mixer-scene-parameters/scene.md) or [`&view`](/advanced-settings/mixer-scene-parameters/view.md) URLs.

Parameter	Explanation
`&scene`	Defines the link to be treated like a scene
`&scenetype`	Shows only the last added video to a scene
`&autoadd`	Auto-adds the specified stream IDs to the scene
`&hiddenscenebitrate`	Can be used to force videos not added yet to a scene to run at the specified bitrate
`&preloadbitrate`	Can be used to change the pre-load target bitrate for scenes
`&waitimage`	You can add a custom image which shows up while waiting for the `&scene` or `&view` link
`&waitmessage`	You can add a custom message which shows up while waiting for the `&scene` or `&view` link
`&waittimeout`	Specifies a delay for `&waitimage` and `&waitmessage` while waiting for the `&scene` or `&view` link

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