Streaming desktop into v4l2loopback

Question

Hello all.
I'm trying to get ffmpeg (using x11grab) to stream my desktop (obviously) into a v4l2loopback device (/dev/video1 , after modprobing it).
I'm having problems getting ffmpeg to output things in the kind of format that would make /dev/video1 readable, however.
This is what I have so far:
$ ffmpeg -f x11grab -s 600x400 -i :0.0 -f null - > /dev/video1
this makes ffmpeg output (something) to /dev/video1 ; which is, unfortunately not readable (checked with mplayer tv:// just in case)
I also tried
$ ffmpeg -f x11grab -s 600x400 -i :0.0 -f video4linux2 /dev/video1
$ ffmpeg -f x11grab -s 600x400 -i :0.0 -f v4l2 /dev/video1
which told me that video4linux2 is not a proper output option. (I would guess so!)
I'm going to use the virtual webcam to record other things, and will mess around with ffmpeg to get proper quality later but I'd like to begin with being simply able to see something.
Thank you for your time.

Answer 1

Hello mirko,
If you are still experiencing streaming issues to your Apple TV from your MacBook, I would use these troubleshooting steps from the following article:
iTunes: Troubleshooting AirPlay and AirPlay Mirroring
Wi-Fi Connection
If you are experiencing intermittent playback or significant network lag with AirPlay, it could be due to a weak Wi-Fi connection, interference, or the distance between the Wi-Fi router and your AirPlay-enabled device.
Ensure that other devices aren't trying to stream to the same Apple TV at the same time.
Ensure that your Wi-Fi router is set up with the recommended settings for the best performance.
Certain external devices, such as microwave ovens and baby monitors, may interfere with a Wi-Fi network. Try moving or disabling these devices.
If your wireless and wired networks are the same, try connecting your Apple TV to the router via Ethernet instead of Wi-Fi.
Use the Wi-Fi network troubleshooting guide to resolve interference and other issues.
Ethernet Connection
Temporarily disable firewalls (both network and local) and security software. Security software and firewalls may block ports that AirPlay uses to stream content. You can often resolve issues with security software by updating, correctly configuring, or uninstalling security software.
Thank you for using Apple Support Communities.
Cheers,
Sterling