Four ways to receive a Stream from your Android phone as a Video/Audio Source in OBS on Ubuntu 22.04 using IP Webcam

Preparation

Read my previous article to install obs: jphein.com/how-to-instal…

I will be using the free Android app called IP webcam. www.google.com/url?sa=t&…

1. Start and configure IP webcam. Run the server.

You can use either USB or Wi-Fi. My Wi-Fi is rather slow, so I’ll be using a USB cable to connect my Android phone to my Ubuntu computer.

2. The second step is to plug your phone into your computer using the USB micro or USB C cable. Then turn on USB tethering on your phone.
NOTE: Some unrooted phones do not allow you to tune on USB tethering if your current ISP does not allow it. If that is the case, you can adb port forwarding instead with this command: (USB debugging must be turned on in Developer settings.

adb forward tcp:8080 tcp:8080

If you use port forwarding instead of USB tethering, or Wifi then your url portion of your uri will be localhost instead of the IP address of the phone.

Option 1 – Use built-in OBS Media Source

The delay is too great for me…

Option 2 – VLC

An easy way is by using VLC, but it seems to also create a delay on my machine. Does anyone have suggestions?

sudo apt --yes install vlc

Then add a VLC media source in OBS, Click the small “+” sign, and “Add Path/URL” then paste your IP Webcam url. See below examples:

MPEG

http://192.168.42.129:8080/videofeed

ULAW (This no longer works for me)

rtsp://192.168.42.129:8080/h264-ulaw.sdp

PCM (This no longer works for me)

rtsp://192.168.42.129:8080/h264-pcm.sdp

Option 3 – Gstreamer with OBS gstreamer plugin

UPDATE: The OBS Snap now includes the gstreamer plugin! It seems to work better than before.

I noticed someone has made a Gstreamer plugin for OBS.

obsproject.com/forum/res…

In order to use this you’ll need to use the PPA version and not the Snap version.

1. Install OBS using PPA:
   launchpad.net/~obsprojec…
2. Download the .so file from obsproject.com/forum/res… and install in /usr/lib/obs-plugins/
3. Add source “gstreamer source” in OBS.

Enter the gstreamer command in the gstreamer input box:

MPEG

souphttpsrc location="http://192.168.42.129:8080/videofeed" do-timestamp=true is-live=true ! multipartdemux ! jpegdec ! videoconvert ! video.

H264 (I can’t get this to work anymore)

uridecodebin uri=rtsp://192.168.42.129:8080/h264_ulaw.sdp name=bin ! queue ! video. bin. ! queue ! audio.

H264 seems to have more delay. MPEG seems to have less delay:

Option 4 – Gstreamer with v4l2loopback

Gstreamer seems to have less delay then the OBS media plugin, VLC, or even ffmpeg. The loopback is sweet, because it let’s you treat your phone just like any other v4l2 device, like a UVC webcam. That way you can use it as a cam for Google Meet, Duo, etc…

Make sure you have gestreamer plugins installed:

sudo apt --yes install gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-plugins-rtp

You can test to make sure that gstreamer connects with the IP webcam from your Android phone by issuing the below command.

gst-launch-1.0 souphttpsrc location="http://192.168.42.129:8080/videofeed" do-timestamp=true is-live=true ! multipartdemux ! jpegdec ! videoconvert ! ximagesink

Install v4loopback

sudo apt install --yes v4l2loopback-utils
sudo modprobe v4l2loopback

Create the virtual webcam

This seems to work with the MPEG stream:

gst-launch-1.0 souphttpsrc location="http://192.168.42.129:8080/videofeed" do-timestamp=true is-live=true ! multipartdemux ! jpegdec ! videoconvert ! v4l2sink device="/dev/video2"

I can’t get this one to work yet.

gst-launch-1.0 souphttpsrc location="http://192.168.42.129:8080/videofeed" do-timestamp=true is-live=true \
    ! multipartdemux \
    ! decodebin3 \
    ! videoconvert \
    ! videoscale \
    ! videorate \
    ! video/x-raw,format=YUY2,width=640,height=480,framerate=24/1 \
    ! v4l2sink device="/dev/video2"

I wonder how you would receive the IP Webcam H264 stream with gstreamer? maybe:

`gst-launch-1.0 rtspsrc location='rtsp://192.168.42.129:8080/h264-ulaw.sdp' ! rtph264depay ! h264parse ! avdec_h264 ! v4l2sink device="/dev/video2"`

Use the output of OBS as a virtual webcam

NOTE: The v42lsink is now inlcuded in OBS! It’s called Start Virtual Camera, and will appear after you install v42loopback.

If you want more than one Android phone streaming to your computer using the loop-back method. You’ll have to reload the loopback module inter kernel with a variable telling it how many loopback devices to make. For two, use the commands below:

sudo modprobe -r v4l2loopback
sudo modprobe v4l2loopback devices=2

NOTE: All this needs to be done before you add the Video Capture Device (V4L2) in OBS. If you make any changes to the video stream after you add the source, you will need to remove the source or close OBS in order to create the loopback again.

I had to use this command to get it to work with Google meet:

sudo modprobe -r v4l2loopback
sudo modprobe v4l2loopback devices=1 video_nr=10 card_label="OBS Cam" exclusive_caps=1

Additional Reading

Learn more about Gstreamer, and rtspatt here: medium.com/nutanix-iot/t…

For automated script for Ubuntu from the “IP Webcam” developer see here: (Uses adb port forwarding, gstreamer, and v42loopback) github.com/bluezio/ipweb…

The blog that has the working mpeg gstreamer command I used: cubethethird.wordpress.c…

ustreamer: If you want to do this with a raspberry pi, or other linux computer with a webcam, instead of an android phone: github.com/pikvm/ustream…

iPhone and Windows

For iPhone see: obsproject.com/forum/res… or apps.apple.com/us/app/nd…

For Windows see here: ip-webcam.appspot.com/