"Four up" output?

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"Four up" output?

Simon
I'm now able to take four input streams from my Blackmagic quad input card
and successfully map them into a single compressed output file. What I'd
like to do next is to "tee-off" a monitoring stream (literally for live
viewing). There are two features I'd like for this:

1) create a composite output that has all four of the inputs laid out one
per quadrant, so all can be seen on a single display

2) preferably simply send this output (in real time, probably obviously) to
a window on the host computer, which I can then position and resize like
any other window onto an actual display of my choosing.

Is this possible? And if it is, what docs will I need to read to understand
how to start on something like this?

Of course if anyone has a ready-to-hand command line that does this (I have
four streams that I use -map to send to the same output file), I won't turn
it down :)

Many thanks!
Simon
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Re: "Four up" output?

Carl Zwanzig
On 6/27/2020 8:53 AM, Simon Roberts wrote:
> 1) create a composite output that has all four of the inputs laid out one
> per quadrant, so all can be seen on a single display

Google "ffmpeg multiviewer", you'll find a handful of ideas, including this-
https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

That should get you started.

z!
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Re: "Four up" output?

Simon
On Sat, Jun 27, 2020 at 10:02 AM Carl Zwanzig <[hidden email]> wrote:

> On 6/27/2020 8:53 AM, Simon Roberts wrote:
> > 1) create a composite output that has all four of the inputs laid out one
> > per quadrant, so all can be seen on a single display
>
> Google "ffmpeg multiviewer", you'll find a handful of ideas, including
> this-
>
> https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos
>
>
Oh, that looks perfect in every respect. The example seems to be exactly
what I wanted, and an explanation to help me help myself later if I need to
fiddle.

Many thanks Carl!
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