# videobeaux: convert_dims

## Description
`convert_dims` resizes videos according to standardized or platform-specific aspect ratio presets.  
It supports direct scaling, padding to maintain aspect ratio, and an optional “translate/stretch” mode to fill target dimensions exactly.

## Features
- Dozens of predefined presets: HD, 4K, Instagram Reels, YouTube Shorts, TikTok, etc.
- Stretch (`--translate yes`) or maintain aspect ratio (`--translate no`).
- New "fill" mode allows uniform scaling with crop to fill the target frame.
- Automatically sets safe `setdar` and `setsar` filters.
- Optional forced overwrite with `-F`.

## Parameters
| Flag | Type | Description |
|------|------|--------------|
| `-i, --input` | str | Input video file |
| `--output-format` | str | Output format (e.g. mp4, mov) |
| `--preset` | str | Target dimension preset (e.g. 1080p, instagram_reels) |
| `--translate` | yes/no | Stretch to fit or preserve aspect ratio with padding |
| `--fill` | yes/no | Crop to fill the target frame (centered) |
| `-F, --force` | flag | Overwrite output file |

## Example Usage
```bash
# Resize to 1080p maintaining aspect ratio
videobeaux -P convert_dims -i ./media/bbb.mov --output-format mp4 --preset 1080p -F

# Force exact stretch to TikTok format (9:16)
videobeaux -P convert_dims -i ./media/bbb.mov --output-format mp4 --preset tiktok_video --translate yes -F

# Maintain ratio with letterboxing to square
videobeaux -P convert_dims -i ./media/bbb.mov --output-format mp4 --preset square1080 --translate no -F

# Fill target aspect ratio (crop edges to fit)
videobeaux -P convert_dims -i ./media/bbb.mov --output-format mp4 --preset instagram_reels --fill yes -F
```

## Output
- Produces scaled MP4 or MOV with proper aspect ratio metadata.
- Compatible with social platforms and web delivery.