# jcodec/jcodec

JCodec main repo

Repository: https://github.com/jcodec/jcodec
Canonical: https://ross.abutalabs.com/products/jcodec
Language: Java
License: BSD-2-Clause
License Family: permissive
Last push: 2025-05-14T14:53:15+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 21, release rhythm 8, longevity 100
- inputs: {"age_days": 5085, "days_push": 476, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1302, forks 318 (observed 2026-08-28T04:04:18.158644+00:00)

## What it is
JCodec is a pure Java implementation of popular video and audio codecs, including H.264, VP8, MPEG, ProRes, and AAC, along with container demuxers/muxers like MP4, MKV, and MPEG TS. It runs on standard Java and Android with no native dependencies.

## Use cases
- decode h264 video in pure java without native libraries
- encode or decode mp4 files from java
- extract frames from video in an android app
- demux or mux matroska mkv files in java
- convert video frames to bufferedimage in java
- read prores video files in jvm applications
- process mpeg ts streams in java

## When to choose
- you need video/audio codec functionality in pure Java or on Android without native dependencies
- you want a BSD-licensed library for MP4/MKV demuxing and muxing on the JVM
- you need basic H.264 decoding or ProRes encode/decode in a Java application

## When to avoid
- you need high performance or full-featured encoding/decoding - native libraries like FFmpeg are far faster and more complete
- you need advanced H.264 encoding features like CABAC or rate control, which are not yet implemented
- you need MP3 decoding or AAC encoding, which are still on the roadmap

## Facets
- artifact type: library
- maturity: maintenance
- function: video-processing, audio-processing, image-processing, parser, serialization
- domain: media, image-processing, developer-tools
- platform: jvm, cross-platform
- tags: video-codec, audio-codec, h264, mp4, matroska, pure-java, prores, demuxer, muxer, video, audio, android

## Member repositories
- jcodec/jcodec (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:18.158644+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 2026-08-30T04:52:09.853634+00:00, confidence not recorded.
  - readme: https://github.com/jcodec/jcodec (fetched 2026-08-28T04:04:18.158644+00:00, sha 21adf67e8923)
- Data as of 2026-08-30T08:39:29.467469+00:00.