fix: validate ffmpeg on context creation #28051

Job	Run time
ubuntu-20.04 (chromium tip-of-tree)	15m 30s
Installation Test ubuntu-latest	12m 35s
ubuntu-22.04 (chromium - Node.js 18)	12m 47s
Installation Test macos-latest	14m 8s
ubuntu-22.04 (firefox - Node.js 18)	24m 27s
Installation Test windows-latest	21m 44s
Test Runner (ubuntu-latest, 18, 1, 2)	30m 50s
ubuntu-22.04 (webkit - Node.js 18)	18m 10s
Test Runner (ubuntu-latest, 18, 2, 2)	6m 2s
ubuntu-22.04 (chromium - Node.js 20)	12m 24s
VSCode Extension	27m 10s
Test Runner (windows-latest, 18, 1, 2)	40m 36s
ubuntu-22.04 (chromium - Node.js 22)	12m 33s
Test Runner (windows-latest, 18, 2, 2)	9m 23s
Web Components	1m 53s
Test Runner (macos-latest, 18, 1, 2)	19m 13s
Test Runner (macos-latest, 18, 2, 2)	5m 22s
Test Runner (ubuntu-latest, 20, 1, 2)	27m 32s
Test Runner (ubuntu-latest, 20, 2, 2)	5m 39s
Test Runner (ubuntu-latest, 22, 1, 2)	28m 42s
Test Runner (ubuntu-latest, 22, 2, 2)	6m 10s
	5h 52m 50s

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