demuxer: Fix demuxer assert logic and refactor FindFFmpeg#186

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crmurillo wants to merge 2 commits intoKhronosGroup:mainfrom

crmurillo:fix_ffmpeg_cmake

Commits on Mar 20, 2026

cmake: refactor FindFFmpeg to fix duplicate logic and variable collisions
crmurillo
committed
demuxer: replace asserts with proper error handling and add FFmpeg hint
crmurillo
committed