Mosaic

🚀

Next-Gen Codecs & CRF

First-class AV1 (libsvtav1), HEVC (libx265), and H.264 encoding with Capped-CRF Content-Aware Bitrate optimization saving 30–50% bandwidth.

🎞️

Storyboard Thumbnails

Automatic timeline scrubber JPEG sprite sheets and WebVTT cue files (thumbnails.vtt) plus HLS I-frame trick-play playlists.

📺

Web Preview DevTools

Built-in dark-mode preview player (mosaic preview) with Hls.js & Dash.js, live quality switching, and telemetry.

🔒

HLS AES-128 Encryption

Automated cryptographic 16-byte key generation and secure segment envelope encryption with standard

☁️

Direct S3 Cloud Upload

Zero-dependency pure Go AWS SigV4 signer for parallel streaming asset syncing directly to S3, MinIO, and Cloudflare R2.

🎚️

Subtitles & Loudnorm

Automatic SRT-to-WebVTT conversion, master playlist injection, and broadcast-standard EBU R128 audio volume leveling.

📐

Aspect Preservation

Dynamic rendition ladders preserving 16:9, 1:1, 9:16 portrait, and non-standard ratios without letterboxing or black bars.

🔄

Orientation Normalization

Auto-probe rotation tags and physical frame transposition with output metadata clearing for seamless mobile playback.

⚡ Interactive Bitrate & Ladder Simulator

⚡

Interactive ABR Ladder & Bitrate Calculator

Live Simulation

Select your source video parameters to simulate how Mosaic computes aspect-preserving ladders, bitrate caps, and VBV buffer sizes.

Source Resolution Preset

Framerate (FPS)

Target Video Codec

Scale Bitrate with High FPS (>30)Content-Aware Capped-CRF

Computed ABR Renditions

Aspect Ratio: 16:9

Tier	Resolution	Max Bitrate	VBV Buffer	Profile & Level	Bandwidth Savings
#1	1920x1080	4400 kbps	8800 kbps	main (4.0)	12%
#2	1280x720	2640 kbps	5280 kbps	main (3.1)	12%
#3	640x360	880 kbps	1760 kbps	baseline (3.0)	12%

Total Renditions:3 Variants

Peak Stream Bandwidth:7920 kbps

Codec Efficiency Gain:Standard Baseline

📺 Live Stream Player Preview

📺

Interactive Stream Player & Inspector

Inspect your local package output folder directly or enter a remote/localhost master.m3u8 URL.

🎬

Select master.m3u8 (or stream files) or drag & drop here

Direct in-memory playback. For local streams, select the master.m3u8 along with variant files.

📊 Live Stream Telemetry & Rendition Controls:Ready

ABR Rendition:

Current Video Dimensions:Auto / Probing...

Current Bitrate:Dynamic

Forward Buffer:0.0s

MosaicAdaptive Bitrate Video Packaging for Go