[FFmpeg-user] Best place for despill filter?

Paul B Mahol onemda at gmail.com
Thu Nov 19 14:19:40 EET 2020

Added commands to despill and frei0r filters.

On Wed, Nov 18, 2020 at 3:48 PM Michael Koch <astroelectronic at t-online.de>

> Am 18.11.2020 um 14:40 schrieb Moritz Barsnick:
> > On Mon, Nov 16, 2020 at 20:15:54 +0100, Michael Koch wrote:
> >> Oh, what a pity. We need more filters with support for commands. Now
> >> that I have found out how to send zmq commands from C# code, there are
> >> so many nice things that could be done with FFmpeg in real time.
> >> Especially when adjusting parameters that need visual feedback, for
> >> example brightness, contrast, gamma, color corrections, colorkey
> >> parameters, despill parameters and so on...
> > Paul has worked heavily over the last few months to add command support
> > to filters (and to properly document it). I guess it just isn't trivial
> > in many cases, as the filters sometimes have not been designed with
> > runtime reconfiguration in mind. (Any it may not be possible at all in
> > certain cases.)
> Yes, I know that Paul has added command support to many filters and I
> really appreciate this work!
> Paul, is it possible to add command support also for the despill filter?
> I'm asking because I've written a C# tool for bluescreening in real
> time. The foreground video comes from a camera via HDMI to USB converter
> (these cheap chinese converters are great!). The background comes from a
> file and is played in an endless loop. I have attached a screenshot. The
> color bars are the built-in test image from the HDMI to USB converter.
> All parameters can be adjusted with the scrollbars in real time and are
> sent to the FFmpeg process as zmq messages. It's already running fine.
> The only problem is that the despill parameters can't be updated in real
> time. They become effective after stopping and re-starting FFmpeg (which
> takes about 2 seconds).
> If you want to see how this was programmed, have a look at chapter 2.56
> of my book:
> www.astro-electronic.de/FFmpeg_Book.pdf
> Michael
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