Hacker News Reader

Comment by AdamMeghji | Hacker News Reader

Is this possible in MacOS at all? I have an RX100 V and an Elgato Camlink HD, but would love to use that capture card w another cam, and use the RX100 over USB simultaneously.

View on HN

It works for Mac

  brew install gphoto2
  brew install ffmpeg --with-ffplay
  gphoto2 --abilities
  # Abilities for camera             : Sony Alpha-A6300 (Control)
  # ...
  gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0  -f matroska - | ffplay -

I'm piping it to ffplay,so this will at least let you test your camera or you could also use it in OBS as a window source. Also, make sure your cameras usb mode is not set to "mass storage" but to a “Remote Camera Control”.

can you try piping that to gstreamer?

Sure, not sure what gstreamer plugin/sink would create a loopback device, but this plays as well.

   gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0  -f matroska - | gst-launch-1.0 fdsrc fd=0 ! decodebin !  videoconvert ! videoscale ! autovideosink

per this - https://apple.stackexchange.com/a/356362

it should be,

  osxvideosink

I wonder if this works,

  gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0  -f matroska - | gst-launch-1.0 fdsrc fd=0 ! decodebin !  videoconvert ! videoscale ! osxvideosink

Thanks for the tip, really appreciate the actual commands. I'm wondering if anyone else is running into this:

    $ brew install ffmpeg --with-ffplay
    Usage: brew install [options] formula

    # Install flags here, nothing about --with.
    Error: invalid option: --with-ffplay

Your right, they removed that option, https://formulae.brew.sh/formula/ffmpeg. I guess ffplay is built with it by default now.

Looks like both gphoto2 and ffmepg are available on homebrew, worth giving it a shot for sure. FWIW - I did end up building my own ffmpeg because debian default didn't have NVIDIA support. Want me to give it a try?

I'd love it if you gave it a try! I've already spent enough hours re-compiling ffmpeg to get nvenc support :)

Spoke too soon, v4l2loopback-utils is the missing piece on mac. Found this with a basic search[0], if anyone enterprising enough wants to take a crack at it

https://apple.stackexchange.com/questions/353168/how-can-i-c...

Yes please! Would love to use my X-T30 as a webcam on my mac.

Cascable Pro Webcam claims to support the RX100 V:

https://cascable.se/pro-webcam/

Compatibility table:

https://cascable.se/help/compatibility/

Here's a simple gui app[0] that creates a syphon stream, and you can use that from an app called camera twist or possibly from OBS as well.

[0] https://github.com/v002/v002-Camera-Live

Reply on news.ycombinator.com