WIP: Ffmpeg decoder, encoders and filters. #23865

Job	Run time
LP64-WIP	4m 2s
manifest-check	2m 50s
build-windows (mnfst, lnl)	9m 59s
build-windows (mnfst, mtl)	9m 29s
build-windows (mnfst, ptl)	9m 21s
build-windows (mnfst, imx8 imx8x)	9m 36s
build-windows (-d, mnfst, lnl)	10m 35s
build-linux (mnfst, ptl)	5m 56s
build-windows (mnfst, imx8m imx8ulp)	10m 2s
build-windows (mnfst, tgl-h)	8m 11s
build-linux (mnfst, tgl)	4m 6s
build-linux (mnfst, imx8 imx8x)	4m 45s
build-windows (mnfst, tgl)	7m 50s
build-linux (mnfst, lnl)	3m 58s
build-linux (mnfst, wcl imx95)	6m 6s
build-linux (-d, mnfst, lnl)	4m 34s
build-linux (mnfst, tgl-h)	4m 20s
build-linux (mnfst, mtl)	4m 21s
build-linux (mnfst, imx8m imx8ulp)	4m 48s
compare-linux-win	28s
	2h 5m 17s

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