FFmpeg upscale command generator

Free and local, but not AI: FFmpeg's scalers resize cleanly and don't invent detail. Good for quick conversions and preparing footage.

Notes

• -2 in the scale filter keeps the aspect ratio and an even width.
• CRF 18 is visually near-lossless for H.264; raise it for smaller files.
• -c:a copy keeps the original audio untouched.