mosaic ~ /usr/local/bin
zsh 5.9
mosaic --version mosaic v0.1.5 · 2026-04-17 · mac | windows | linux mosaic --help MOSAIC // batch video thumbnailer Generate contact sheets, screenshots, and animated previews from any ffmpeg-decodable video. Cross-platform, runs locally, auto-updates from v0.1.2 on. mosaic-cli sheet movie.mkv wrote movie_sheet.png · batch-ready CLI for scripts ls ./available-builds
01.
mac
mosaic_universal.dmg
--
02.
windows
mosaic_x64-setup.exe
--
03.
win-arm
mosaic_arm64-setup.exe
--
04.
linux
mosaic_amd64.AppImage
--
download → latest release read the manual source on github
~/mosaic/cli

Command-line binaries

For scripting, headless servers, and CI. Requires ffmpeg, ffprobe, and mediainfo on PATH — same as the app.

install mosaic-cli
one-liner
# macOS & Linux curl -LsSf https://mosaicvideo.github.io/mosaic/install.sh | sh # Windows (PowerShell) irm https://mosaicvideo.github.io/mosaic/install.ps1 | iex

Verifies the SHA-256 checksum, installs to a user-scoped directory, and prints next steps. Full CLI docs & manual install →

~/mosaic/output-types

4 output types, 1 batch queue

Drop videos or folders, pick what to produce, walk away. Every pipeline runs your local ffmpeg — nothing leaves the machine.

IDX
NAME
DESCRIPTION
OUTPUT
01.
contact_sheets/
Grid of timestamped frames at configurable rows × columns. Ideal for archival indexes or preview catalogs.
PNG · JPEG
02.
screenshots/
Individual frames at evenly-spaced timestamps, with configurable count. Full-resolution, numbered, named after the source video.
PNG · JPEG
03.
animated_reels/
Short clips stitched end-to-end into a single reel. Motion preview without opening a video player.
WebP · WebM · GIF
04.
animated_sheets/
Grid of animated thumbnail clips — every cell loops a short motion clip. Motion at a glance, contact-sheet layout.
WebP
~/mosaic/flags

Built for real work

Four decisions that shape how Mosaic behaves under load.

batch-queue
Drop folders. Per-file progress. Cancel at any point without corrupting in-flight outputs.
hdr-tonemap
HDR10, HLG, and Dolby Vision videos produce clean SDR thumbnails without a manual tonemap step.
local-only
Videos never leave the machine. Zero analytics. The only network call is an update check against GitHub's public API.
mosaic-cli
Every pipeline as a subcommand — screenshots, sheet, reel, animated-sheet, probe. Stdout is paths-only so it pipes cleanly into xargs. Docs →
~/mosaic/screenshots/app.png

The app

Minimal by design. Dark-by-default, follows your system theme. Native on every platform.

Mosaic app — drag-and-drop queue with files processing
mosaic.app · v0.1.3 · mac-universal prores 422 source