Download Fastcodec


FastCodec is a fast lossless video codec. Compression algorithm is relatively simple and fast.

  • Lossless and lossy (near lossless) compression.
  • Fast preview mode decompression.
  • Lossless compression requires frame width and height must be a multiple of 4. Lossy compression requires frame height is multiple of 4 and frame width is multiple of 8.
  • Supported input and output formats: YUY2/YUNV/V422/YUYV, YVYU, UYVY/Y422/UYNV, RGB24, RGB32.

Some performance results can be found in MSU Lossless Video Codecs Comparison ‘2007.


I. CPU detection. Codec detects supported CPU instruction sets in runtime and chooses fastest algorithm implementation.

II. Compression settings. YUV compression is always lossless. RGB compression can be (A) absolutely lossless (mathematically identical) and (B) visually lossless (human eye cannot see a difference). Visually lossless RGB results in slightly better compression.

III. Decompression settings. Preview mode (A) is a special feature for super fast decompression with low image quality. Could be helpful on slow machines.</p>

IV. Logging. Codec can write some information to the specified file while compression/decompression. That is mostly used for debugging purposes and should be disable for the best performance.