I encode videos for Livestream pretty routinely, and I'm looking to
automate the process a bit more. Specifically, classic Livestream (which
is what I use) has a 25 FPS maximum to use FLVs straight and not
re-encode them. I can use an FFmpeg filter to set my output FPS to 25,
but that's not what I want, because if my source video already has a
framerate less than 25, there's no sense increasing it for no reason.
So. Is there a way to tell FFmpeg to only /decrease/ to the desired
framerate, similar to the 'force_original_aspect_ratio=decrease'
setting? Or a way to say, for instance, 'set FPS to the minimum of 25
and the current frame rate'? This is the line I'm currently using in my
Windows batch file; I believe setting the FPS /to/ 25 would be as simple
as adding ',fps=25' inside the quoted parameters for -vf, but I haven't
tested it.
"D:\ffmpeg\ffmpeg" -y -i "%~1" -vf
"scale=w=480:h=360:force_original_aspect_ratio=decrease" -b:v 400k -b:a
64k -ar 22050 -f flv "%~n1.flv"
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