MP4 Video Compressor

This tool re-encodes MP4 video files to reduce size for sharing, hosting, or delivery. Target users: video creators, editors, marketers, and platform managers who must meet upload limits or bandwidth constraints. Example: compress a 2.5 GB 4K clip to under 100 MB while preserving visible quality for social feeds.
Conceptually, it performs bitrate-driven compression with optional resolution and frame-rate adjustments. It accepts input_file (MP4), target_size_mb or target_bitrate_kbps, optional target_resolution, video_codec, audio_codec, and audio_bitrate. Outputs include output_file, new_size_mb, encoding_time_seconds, and quality metrics.
Key differentiators: auto bitrate estimation to meet target size, two-pass encoding for better quality at a fixed size, and presets that balance speed and accuracy. It reports detailed stats and supports common configurations; advanced users can tweak CRF ranges and encoder choices when needed.
Use cases include social media clips, ad assets, short-form content, and archival footage where storage is a concern. Limitations: requires standard MP4 input; extremely aggressive targets may degrade quality; DRM-protected files are not processable; no watermarking.