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This is a listing of open-source implementations of media formats—usually called codecs. Many of the codecs listed implement media formats that are restricted by patents and are hence not open formats. For example, x264 is a widely used open source implementation of the heavily patent encumbered MPEG-4 AVC media format.

• x264 – H.264/MPEG-4 AVC implementation. x264 is not a codec (encoder/decoder); it is just an encoder (it cannot decode video).
• OpenH264 – H.264 baseline profile encoding and decoding
• x265 – An encoder based on the High Efficiency Video Coding (HEVC/H.265) standard.
• Xvid – MPEG-4 Part 2 codec, compatible with DivX
• libvpx – VP8 and VP9 implementation; formerly a proprietary codec developed by On2 Technologies, released by Google under a BSD-like license in May 2010.
• FFmpeg codecs – Codecs in the libavcodec library from the FFmpeg project (FFV1, Snow, MPEG-1, MPEG-2, MPEG-4 part 2, MSMPEG-4, WMV2, SVQ1, MJPEG, HuffYUV and others). Decoders in the libavcodec (H.264, SVQ3, WMV3, VP3, Theora, Indeo, Dirac, Lagarith and others).
• Lagarith – Video codec designed for strong lossless compression in RGB(A) colorspace (similar to ZIP/RAR/etc.)
• libtheora – A reference implementation of the Theora format, based on VP3, part of the Ogg Project
• Dirac as dirac-research, a wavelet based codec created by the BBC Research, and Schrödinger, an implementation developed by David Schleef.[1]
• Huffyuv – Lossless codec from BenRG
• Daala (working name) – Video codec under development by the Xiph.Org Foundation. Daala is intended to be a high-efficiency codec for use cases similar to those of High Efficiency Video Coding (HEVC or H.265) and VP9.
• Thor – royalty free video codec under development by Cisco Systems.