# gpac/gpac

GPAC Ultramedia OSS for Video Streaming & Next-Gen Multimedia Transcoding, Packaging & Delivery

Repository: https://github.com/gpac/gpac
Canonical: https://ross.abutalabs.com/products/gpac
Homepage: https://gpac.io
Language: C
License: LGPL-2.1
License Family: copyleft
Topics: streaming, graphics, gpac, mp4box, mpeg-dash, hls, mp4, cenc, mpeg-ts, broadcast, vr, mov, prores, atsc3, tiling, low-latency-hls
Last push: 2026-08-26T16:11:42+00:00

## Health v2 (maintenance only)
Score: 89/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 70, longevity 100
- inputs: {"age_days": 4505, "days_push": 7, "days_rel": 40, "gap_med": 169, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3296, forks 589 (observed 2026-08-28T04:07:55.531915+00:00)

## What it is
GPAC is an open-source multimedia framework for processing, inspecting, packaging, streaming, and playing audio, video, subtitles, encrypted media, and 2D/3D graphics. It is best known for its MP4/ISOBMFF tooling (MP4Box) and MPEG-DASH/HLS packaging capabilities used by broadcasters and streaming services.

## Use cases
- package mp4 files for mpeg-dash streaming
- generate hls segments and manifests from video files
- inspect and remux mp4 or mov containers
- encrypt video with cenc for drm delivery
- convert prores or mpeg-ts files to fmp4/cmaf
- build low-latency hls live streaming pipelines
- mux subtitles like webvtt and ttml into mp4
- transcode and package media for broadcast delivery

## When to choose
- you need standards-compliant ISOBMFF/MP4 packaging or DASH/HLS segmentation
- you work in broadcast, streaming, or media research and need CENC encryption or ATSC 3.0 support
- you want a scriptable CLI alternative to FFmpeg focused on packaging and streaming

## When to avoid
- you only need simple video encoding/transcoding without packaging - FFmpeg may be simpler
- you need a polished end-user media player GUI
- you need lightweight library integration without a large framework dependency

## Facets
- artifact type: framework
- maturity: stable
- function: video-processing, audio-processing, streaming, cryptography, cli, gui, graphics, middleware
- domain: media, web-development, developer-tools, simulation
- platform: windows, cross-platform, cli
- tags: mp4box, mpeg-dash, hls, isobmff, cenc, mpeg-ts, cmaf, low-latency-hls, atsc3, prores, media-packaging, transcoding, subtitles, vr, broadcast, video, audio, broadcasting, linux, macos, ios, android, web-server

## Member repositories
- gpac/gpac (main) score 89

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:55.531915+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:22:42.576050+00:00, confidence not recorded.
  - readme: https://github.com/gpac/gpac (fetched 2026-08-28T04:07:55.531915+00:00, sha bbd5664ae7d7)
  - homepage: https://gpac.io (fetched 2026-08-29T09:37:21.064109+00:00, sha ae31740a837c)
  - site_page: https://gpac.io/about (fetched 2026-08-29T09:37:21.073814+00:00, sha e59114c1e49b)
  - site_page: https://gpac.io/features (fetched 2026-08-29T09:37:21.075780+00:00, sha 48e0896799e5)
  - site_page: https://gpac.io/category/features (fetched 2026-08-29T09:37:21.081079+00:00, sha 5faebfad084a)
  - site_page: https://gpac.io/faq (fetched 2026-08-29T09:37:21.077608+00:00, sha c87460c68aa8)
  - site_page: https://wiki.gpac.io/ (fetched 2026-08-29T09:37:21.079470+00:00, sha c47429dd79b9)
- Data as of 2026-08-30T08:39:29.467469+00:00.