Advanced Settings

After picking an output format, Medix asks whether you want to configure advanced settings. Say yes and you get control over every knob that matters for modern encoding.

Video codec

Option	libffmpeg name	Notes
H.264	libx264	Best compatibility, default for most formats
H.265	libx265	Better compression, requires modern decoders
VP9	libvpx-vp9	Open, default for WebM
AV1	libaom-av1	Best compression, slow encode
MPEG-4	mpeg4	Legacy
copy	—	Container remux, no re-encode

Audio codec

Option	Notes
AAC	Default for MP4/MKV/MOV/TS
MP3	Legacy-friendly
Opus	Default for WebM, best quality/bitrate ratio
AC3	Surround-compatible
FLAC	Lossless
copy	No re-encode

Resolution

Option	Dimensions
Keep original	(no scaling)
4K	3840 × 2160
2K	2560 × 1440
1080p	1920 × 1080
720p	1280 × 720
480p	854 × 480
360p	640 × 360

Aspect ratio is preserved.

Frame rate

Keep original, or cap to 24, 25, 30, 48, or 60 fps.

Encoding preset

Only relevant for libx264 and libx265. Controls the speed/compression trade-off:

ultrafast  superfast  veryfast  faster  fast  medium  slow  slower  veryslow
← faster / larger                                  smaller / slower →

medium is the default and a good balance.

CRF (Constant Rate Factor)

Range: 0–51 for H.264 / H.265.

CRF	Quality
0	Lossless
18	Visually lossless
23	Default, very good
28	Smaller files, still decent
51	Worst quality

Lower CRF = higher quality = larger file.

Audio bitrate

Auto (codec-dependent default), or explicit: 96k, 128k, 192k, 256k, 320k.

How it maps to ffmpeg

Medix builds an ffmpeg command from your choices. A typical result:

ffmpeg -i input.vob \
  -c:v libx264 -preset medium -crf 23 \
  -c:a aac -b:a 192k \
  output.mp4

You can see the exact command Medix would run with --dry-run. See Dry Run Mode.