# Video Generator Voiceover

Small helper scripts for creating timed tutorial voiceovers from `.srt` files and replacing a video's original audio with the generated voiceover.

## Files

- `scripts/make_voiceover_macos.py` — creates timed WAV/optional MP3 voiceover on macOS
- `scripts/make_voiceover_windows.py` — creates timed WAV/optional MP3 voiceover on Windows
- `scripts/combine_video_audio.py` — replaces video audio and exports final MP4
- `subtitles/` — optional place to keep SRT files
- `output/` — optional place to save generated audio/video files

## Install

### Windows

```powershell
winget install Gyan.FFmpeg
```

Install Python from `python.org` or Microsoft Store, then reopen PowerShell and check:

```powershell
ffmpeg -version
python --version
```

### macOS

```bash
brew install ffmpeg
```

Python is already available on most Macs. If needed, install it from `python.org`.

## Create voiceover

Run from the `video-generator` folder. Pass your own SRT and output paths.

### Windows

```powershell
python scripts/make_voiceover_windows.py `
  --srt "video-generator/subtitles/your_subtitles.srt" `
  --voice "Microsoft David Desktop" `
  --rate 0 `
  --wav "video-generator/output/voiceover.wav" `
  --mp3 "video-generator/output/voiceover.mp3"
```

### macOS

```bash
python video-generator/scripts/make_voiceover_macos.py \
  --srt "video-generator/subtitles/your_subtitles.srt" \
  --voice "Daniel" \
  --rate 185 \
  --wav "video-generator/output/voiceover.wav" \
  --mp3 "video-generator/output/voiceover.mp3"
```

`--mp3` is optional. Use WAV when combining with video.

## Combine video + audio

This removes the original video audio and uses the generated voiceover.

### Windows

```powershell
python video-generator/scripts/combine_video_audio.py `
  --video "video-generator/input/your_video.mp4" `
  --audio "video-generator/output/voiceover.wav" `
  --output "video-generator/output/final_video.mp4"
```

### macOS

```bash
python video-generator/scripts/combine_video_audio.py \
  --video "video-generator/input/your_video.mp4" \
  --audio "video-generator/output/voiceover.wav" \
  --output "video-generator/output/final_video.mp4"
```

Use absolute paths if files are outside this folder.

## Voice and speed options

### Windows voice list

```powershell
Add-Type -AssemblyName System.Speech
$synth = New-Object System.Speech.Synthesis.SpeechSynthesizer
$synth.GetInstalledVoices() | ForEach-Object { $_.VoiceInfo.Name }
```

Good tutorial voices: `Microsoft David Desktop`, `Microsoft Mark` if available.

Windows speed uses `-10` to `10`:

```powershell
python video-generator/scripts/make_voiceover_windows.py `
  --srt "video-generator/subtitles/your_subtitles.srt" `
  --wav "video-generator/output/voiceover.wav" `
  --voice "Microsoft David Desktop" `
  --rate 2
```

To add voices: `Settings > Time & language > Speech > Manage voices > Add voices`.

### macOS voice list

```bash
say -v '?'
```

Good tutorial voices: `Daniel`, `Reed (English (US))`, `Eddy (English (UK))`.

Speed example:

```bash
python video-generator/scripts/make_voiceover_macos.py \
  --srt "video-generator/subtitles/your_subtitles.srt" \
  --wav "video-generator/output/voiceover.wav" \
  --voice "Daniel" \
  --rate 190
```

## Notes

If a caption has too much text for its time slot, the script keeps the SRT timing and trims the speech. Fix that by increasing the subtitle duration, shortening the sentence, or increasing speed.

If the final MP4 has compatibility issues, add `--reencode-video` to the combine command.