What is the VP3 file format?
A .vp3 file contains video encoded with the VP3 codec, developed by On2 Technologies (formerly The Duck Corporation). VP3 uses DCT-based intra- and inter-frame compression with 8×8 block transforms, motion estimation, and variable quantization - an approach similar in structure to MPEG-4 Part 2.
On2 released VP3.1 in May 2000, then open-sourced VP3.2 in August 2001. In June 2002, On2 donated VP3.2 to the Xiph.Org Foundation with an irrevocable royalty-free patent grant. Xiph used it as the direct basis for the Theora codec, whose bitstream was frozen in 2004. Files bearing the .vp3 extension are uncommon - most VP3-encoded content was distributed in .ogg or .ogv containers rather than as bare .vp3 streams.
When wrapped in an Ogg container, the file begins with the standard OggS magic bytes (4F 67 67 53). The video stream uses YCbCr 4:2:0 color space; the Ogg container provides page-level CRC32 checksums. Practical resolutions ranged from 320×240 to 640×480 (standard definition era).
On2 Technologies was acquired by Google in February 2010; Google drew on On2's later VP8 work for the WebM ecosystem. VLC, FFmpeg, and MPC-HC can decode .vp3 files today.
Security & safety
RISK: LOWStandard video file; no executable content. Play only from trusted sources as with any media file. No known VP3-specific vulnerabilities in modern players.
Format details
in a nutshellPrograms that open VP3 files
Windows4 apps
Windows Media Player
Built-in May play VP3 with appropriate codec pack installed; not reliable without codec. Use VLC instead. 
MPC-HC (Media Player Classic Home Cinema)
Open-source Open the .vp3 file; MPC-HC includes VP3/Theora decoder via LAV Filters. 
macOS2 apps
Linux2 apps
Technical details
deep spec| Codec type | DCT-based intra- and inter-frame video codec; predecessor to Theora |
| Container | Ogg (most common), bare raw VP3 stream, or early AVI container |
| Magic bytes | OggS (4F 67 67 53) at offset 0 when wrapped in Ogg; raw VP3 stream has no fixed signature |
| Color space | YCbCr 4:2:0 (8 bpp per channel) |
| Block structure | 8×8 DCT blocks with motion estimation and variable quantization tables |
| Practical resolutions | 320×240 to 640×480 (SD era); theoretical maximum 4096×4096 |
| Checksum | Ogg container provides page-level CRC32 checksums |
| Byte order | Big-endian (bitstream level) |
| License | Open-source (LGPL from March 2002; irrevocable royalty-free patent grant June 2002) |
| Donated to Xiph | June 2002; became direct basis for Theora codec (bitstream frozen June 2004) |
| Developer | On2 Technologies (formerly The Duck Corporation); acquired by Google February 2010 |
| MIME type | video/x-vp3 (bare stream) or video/ogg (Ogg container) |
| Released | May 2000 (VP3.1); August 2001 (VP3.2 open-sourced) |
| Latest version | VP3.2 (final version; donated to Xiph.Org Foundation June 2002, became basis for Theora) |
| Open standard | Yes · royalty-free |
| Specification | en.wikipedia.org |
VP3 conversions
Community Q&A
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