split-video
Split a wide (3840x1080) side-by-side video into separate screen and camera files using ffmpeg. Use when the user says "split this file" or wants to split a wide video recording.
What this skill does
# Split Wide Video
Splits a 3840x1080 side-by-side video into two 1920x1080 files: one for the screen capture (left half) and one for the camera (right half).
## Arguments
- `$0`: (optional) path to the video file to split
## Workflow
1. **Resolve the input file**:
- If `$0` is provided, use it.
- Otherwise, search for video files (*.mp4, *.mkv, *.mov, *.avi) in these directories in order:
1. The current working directory
2. `~/` (home directory)
3. `~/Videos/`
- If exactly one video file is found across all searched directories, confirm with the user that it's the right one.
- If multiple video files are found, use `AskUserQuestion` to ask which file to split.
- If no video files are found in any of those locations, use `AskUserQuestion` to ask for the file path.
2. **Verify the video dimensions** using ffprobe:
```bash
ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=p=0 "<input_file>"
```
- Expected: 3840x1080 (or similar wide format where width is ~2x height).
- If dimensions don't match, warn the user and ask if they want to proceed anyway.
3. **Split the video** into two files:
- Screen capture (left half):
```bash
ffmpeg -i "<input_file>" -filter:v "crop=1920:1080:0:0" -c:v libx264 -crf 18 -preset fast -c:a aac -b:a 192k "<base>-screen.mp4"
```
- Camera (right half):
```bash
ffmpeg -i "<input_file>" -filter:v "crop=1920:1080:1920:0" -c:v libx264 -crf 18 -preset fast -c:a aac -b:a 192k "<base>-cam.mp4"
```
Where `<base>` is the input filename without its extension.
4. **Report results**: Tell the user the names of the two output files created.
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