Blackmagic Forum

Trying to figure out how to export vertical video from my Blackmagic Atem Mini Pro. I'll be live-streaming, using a Sony A7RIII, the Atem, and Bambuser as my destination. I'm assuming I would need to crop or rotate the image, or that Blackmagic may have some hidden feature in the Atem or in Software Control, but if so I haven't been able to find it.

The ATEM switchers only support broadcast video standards and aspect ratios (which means 16:9 for HD video). You can do some manipulation with the DVE, but the output video frame would still be a 16:9 resolution, so this would be a sort of manual letter-boxing.

If you really need a vertical aspect ratio for the stream itself (rather than just a vertical center crop of a 16:9 video), you would probably need to use streaming software such as OBS Studio where you can set an arbitrary canvas size.

Maybe some help inside this...

Robert Schemitsch wrote:https://www.youtube.com/watch?v=f2picMQC-9E

Maybe some help inside this...

Instagram and TikTok didn't get the note

The only way I've seen this done with professional kit it to literally run all your cameras and monitors mounted on their sides. Then use a software encoder to do the rotation and stream it at the 9:16 ratio.

There's basically no professional support for 9:16 aspect ratios - SDI certainly didn't, and I don't think even HDMI has support for it (9:16 images from computers are sent as 16:9 data with the content rotated, or as pillarboxed, shrunken images into a 16:9 feed from phones). So you can't get a 9:16 images in or out of an Atem, even if the Atem itself supported the aspect ratio!

If you rotate in the mixer, you also reduce your resolution by nearly 3/4, and you'll still end up with 16:9 video coming out of the switcher - which will then be displayed as a postage stamp on a phone in portrait mode.

Edit to add - this is how they produced a dedicated portrait video coverage of a German football match - https://www.svgeurope.org/blog/headline ... rait-mode/

Adding to the answer of James Goodwin, here is a link to a BTS video of Ryan Somerfield where they did exactly this for a TikTok live stream.

I bought the Atem Mini Pro for online live sales for my wife in vertical (9:16) live stream format using RTMP, but I forgot to check if the capability was there without a computer. It appears I will be trying out the Osee GoStream Deck for the same price now in Nov 2024. There's also the DJI Pocket Osmo 3 or the Yolo Mini.