Millicast video streaming
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We officially support up to 2 streams. Running more than two is possible but we cannot ensure optimal performance. Going above performance guidelines can cause lower hardware clients to run slower and provide a below optimal experience.
Example:
If youâre using BPM_VideoPlayer instead, you may have to check your screen controls and make sure the âMillicastâ option is selected.
When streaming, you have to select either vp8 or vp9 codecs. h.264 is not supported by Unreal.
Furthermore RTMP and RTMPS are not supported.
OBS Output Tab
Video and Audio Bitrate will determine the amount of data per second which will be transferred to the client.
Note that bitrate numbers are Not an exact science, and the server will internally modulate this number to better fit the connection, so the resulting bitrate can be much higher than that. What we know is that those numbers will still influence the stream in some way. More of this in recommended settings.
Encoder is usually never changed. Has to be noted that using H264 currently has problems with Millicast for Unreal.
Encoder Preset can change the how quick the image gets encoded/decoded in expense of image quality.
Output (Scaled) Resolution is the important one as it is the resolution the client will receive, scaled from the initial input.
Downscale Filter states how precise the scaled image will be when generated. Unless specific needs, a Bicubic should be fine.
Common FPS Values are the target frames per second the server will send to the clients. There is currently no point to go higher than 30 as the game instances we use are capped at 30 FPS. Also to note that this parameter highly influences performance.
The following values are to be taken as an example, and to consider if the hardware to support is down to the level of a G6_Half or lower budget.
Having multiple screens in the scene will add little performance loss. Most of Millicast performance cost is given by each data stream.
Other than the supported hardware, will depend on how many streams are intended to be used. Only the most influential parameters are named, the rest is at user choice:
Budget for pixels: as many as a resolution of 1920x1080
Budget for video bitrate: 4000
Common FPS Values: 30 or lower
Output (Scaled) Resolution: 1920x1080
Video Bitrate: 4000
Audio Bitrate: 192
Common FPS Values: 30
Output (Scaled) Resolution: 1280x720
Video Bitrate: 2000
Audio Bitrate: 192
Common FPS Values: 30
From a non-shipping client build it is possible to print the stats for the current active Millicast streams in the scene by using the command:
M2.Millicast.PrintStreamsStats
which, for each active stream, will print the following info:
FAQ
Q: I want to stream pre-recorded video, should I use millicast?
Q: I have added multiple Millicast screens and the performance is poor, what should I do?
A: Performance will decrease with each additional video played in your world. Please re-consider if multiple Millicast Screens is an appropriate solution to your problem.
Blueprint Loaded Sublevels: The control panels used to control Millicast screens detect available screens in their MorpheusBeginPlay. This means that if you have Millicast screens in sublevels that are dynamically loaded, there are no guarantees their detection of available screens will happen after those assets have been loaded. To avoid this issue, ensure that all Millicast screens are in always loaded sublevels.
Millicast is a third-party streaming solution offered by which is an e2e solution for recording, encoding and showing live video streams in the experience.
Follow the steps to get a video feed running in-game.
Your Stream Name and Account Id can be found on
Stream Url should be set to:
A: No, please use the lightweight instead.
