MKV to MP4: The Complete Remux Guide — Zero Quality Loss with -c copy
Convert MKV to MP4 the fast, lossless way using FFmpeg remux. Remux vs. re-encode compared, the three typical failure modes (subtitle format, non-standard audio, AV1/VP9), movflags +faststart explained, and a practical audio-only re-encode recipe.
April 18, 2026
