描述
Core Features
- Support batch selection of images, videos, and audio (up to 20 files)
- Support multiple media formats
- Images: JPEG/PNG/HEIC/WebP/AVIF
- Videos: MOV/MP4/M4V
- Audio: MP3/M4A/AAC/WAV/FLAC/OGG
- Real-time processing progress display
- Intelligent quality protection mechanism
Three Main Modules
1. Compression
Image Compression
- Support JPEG/PNG/HEIC/WebP/AVIF formats
- Use MozJPEG for high-quality JPEG compression
- PNG compression using pngquant + optional Zopfli (lossy quantization + lossless deflate)
- **Animated WebP Support**:
- Auto-detect animated WebP (multi-frame)
- Option to preserve animation or convert to static image
- Frame-by-frame compression, maintaining timeline information
- Smart fallback: preserve original file if compressed lossless format is larger
- Visual indicator: clearly display animation status and frame count
- **Animated AVIF Support**:
- Auto-detect animated AVIF
- Option to preserve original animation (pass-through) or convert to static image
- Adjustable compression quality (10%-100%)
- Support resolution adjustment (Original/4K/2K/1080p/720p)
- Auto orientation detection (landscape/portrait)
- Smart decision: preserve original file if compressed version is larger
Video Compression
- Support MOV/MP4/M4V formats
- Use FFmpeg hardware-accelerated encoding (VideoToolbox)
- Support H.264 and H.265/HEVC encoding
- Adjustable resolution (Original/4K/2K/1080p/720p)
- Adjustable frame rate (23.98-60 fps, only supports lowering frame rate)
- Metadata control: preserves container tags by default, when "Preserve Metadata" is disabled, uses FFmpeg \`-map_metadata -1\` to remove metadata from exported files
- Bitrate control:
- **Auto Mode** (default): intelligently adjusts based on target resolution
- 720p ≈ 1.5 Mbps
- 1080p ≈ 3 Mbps
- 2K ≈ 5 Mbps
- 4K ≈ 8 Mbps
- **Custom Mode**: manually set bitrate (500-15000 kbps)
- Actual bitrate may be lower than target (VideoToolbox dynamically adjusts based on content complexity to optimize efficiency)
- Smart decision: preserve original file if compressed version is larger
Audio Compression
- Support MP3/M4A/AAC/WAV/FLAC/OGG input
- Multiple output format options:
- **Original**: preserve input file format (default)
- MP3 (libmp3lame)
- AAC
- M4A
- OPUS
- FLAC (lossless)
- WAV (uncompressed)
- 8 bitrate options (32-320 kbps)
- 32 kbps - Very low quality
- 64 kbps - Voice/Podcast (mono)
- 96 kbps - Low quality music
- 128 kbps - Standard MP3 quality (default)
- 160 kbps - Good music quality
- 192 kbps - Very good quality
- 256 kbps - High quality music
- 320 kbps - Maximum MP3 quality
- 7 sample rate options (8-48 kHz)
- 8 kHz - Telephone quality
- 11.025 kHz - AM radio
- 16 kHz - Wideband voice
- 22.05 kHz - FM radio
- 32 kHz - Digital broadcast
- 44.1 kHz - CD standard (default)
- 48 kHz - Professional audio
- Channel selection (mono/stereo)
- Smart quality protection: prevent low-quality audio from being "upscaled"
- Smart decision: preserve original file if compressed version is larger
2. Resolution Adjustment
- Batch adjust image and video resolution
- Preset multiple common sizes (4K wallpaper, phone wallpaper, social media, etc.)
- Support custom resolution
- Smart cropping and scaling, maintaining image integrity
3. Format Conversion
- Batch convert image formats: JPEG ↔ PNG ↔ WebP ↔ HEIC ↔ AVIF
- Batch convert video formats: MP4 ↔ MOV ↔ M4V
- Batch convert audio formats: MP3 ↔ M4A ↔ AAC ↔ FLAC ↔ WAV ↔ OGG
- Lossless conversion (where possible), maintaining original quality
- No compression, only format modification
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