user38536: Combining ANALOG video feeds -- real time/low latency
We fly fpv. One pilot, one second operator controlling the camera, both have analog video feeds.
Pilot vtx feed: backgrond
gimbal feed: we want a small rectangle in the corner overlaying the pilot's background feed
requirements:
real time, as we fly FPV, added latency < 20 ms ideally
Which (ready made) hardware would allow this?
The inputs are AV out (we can convert to any plug).
Should be portable and battery powered, ideally.

user14523: You'll need an analog DVE. They aren't really manufactured anymore, but you can probably find something used. If you don't need to resize the overlay video, you might be able to get away using an analog switcher with a mix/effects bus and applying a wipe.
No matter what, you'll need to frame sync the two feeds. That will add at least one frame (33ms) of delay. A DVE might add another frame on top of that.

38536: <p>Combining ANALOG video feeds -- real time/low latency</p>
<p>We fly fpv. One pilot, one second operator controlling the camera, both have analog video feeds.</p>
<p>Pilot vtx feed: backgrond
gimbal feed: we want a small rectangle in the corner overlaying the pilot's background feed</p>
<p>requirements:
real time, as we fly FPV, added latency &lt; 20 ms ideally</p>
<p>Which (ready made) hardware would allow this?
The inputs are AV out (we can convert to any plug).</p>
<p>Should be portable and battery powered, ideally.</p>
 14523: <p>You'll need an analog <a href="https://en.wikipedia.org/wiki/Digital_video_effect" rel="nofollow noreferrer">DVE</a>. They aren't really manufactured anymore, but you can probably find something used. If you don't need to resize the overlay video, you might be able to get away using an analog switcher with a mix/effects bus and applying a wipe.</p>
<p>No matter what, you'll need to frame sync the two feeds. That will add at least one frame (33ms) of delay. A DVE might add another frame on top of that.</p>
