Changelog

0.6.0 (2025-11-20)

Performance Improvements

• Optimize block copy operations in videos (#35) (5b531b7)

  This change gives a major increase to decoding speed for most videos. FPS (frames per second) improvements of between 20% and 1,200% can be seen in the benchmarks (“hz” represents the median FPS):

  > unbikit@0.6.0 bench
  > vitest bench --run
  
  RUN  v4.0.10
  
  ✓ tests/main.bench.ts > benchmark 72906ms
      name                                    hz     min      max    mean     p75     p99    p995    p999     rme  samples
    · decode of a frame of testfile01     755.62  0.0723  10.1624  1.5887  1.7413  3.4561  3.7919  4.8968  ±0.64%    10000
    · decode of a frame of testfile02  25,939.23  0.0252   4.4826  0.3243  0.0380  2.2814  2.8931  3.8021  ±4.02%    10000
    · decode of a frame of testfile03  48,525.00  0.0104   3.5536  0.1862  0.3992  0.7494  1.6234  2.3394  ±2.69%    10000
    · decode of a frame of testfile04   2,185.17  0.0303   6.8059  1.5158  2.1640  4.4432  5.2130  6.0582  ±1.31%    10000
    · decode of a frame of testfile05   3,699.67  0.0450   7.6835  0.8676  1.4391  2.4982  3.2387  5.8404  ±1.70%    10000
    · decode of a frame of testfile06   4,129.25  0.0291   4.2722  0.9196  1.3440  3.0265  3.1956  3.4895  ±1.48%    10000
    · decode of a frame of testfile07   2,488.67  0.0118   7.5235  1.7021  2.1133  4.0822  4.3607  6.4656  ±0.94%    10000
  
  
  > unbikit@0.5.0 bench
  > vitest bench --run
  
  RUN  v4.0.10
  
  ✓ tests/main.bench.ts > benchmark 85055ms
      name                                   hz     min      max    mean     p75     p99    p995     p999     rme  samples
    · decode of a frame of testfile01    624.68  0.3201   161.58  1.7983  1.9422  3.5596  4.0219   4.9948  ±1.83%    10000
    · decode of a frame of testfile02  4,741.15  0.1519   9.0390  0.4753  0.2243  2.4211  3.9970   7.0758  ±3.05%    10000
    · decode of a frame of testfile03  3,818.20  0.1803   6.9488  0.3642  0.5529  0.8825  2.4169   3.7548  ±1.69%    10000
    · decode of a frame of testfile04    711.86  0.4686  45.0704  1.8906  2.4002  4.5546  5.2643   6.7018  ±1.53%    10000
    · decode of a frame of testfile05    709.65  0.7739  14.8372  1.6529  2.1308  3.1394  4.3492  12.5871  ±1.07%    10000
    · decode of a frame of testfile06    916.90  0.5484  11.1577  1.3421  1.6770  3.1628  3.4305  10.7946  ±1.14%    10000
    · decode of a frame of testfile07  1,504.80  0.1389  26.1466  0.7944  0.8737  1.4899  2.6282   3.3601  ±1.62%    10000

• Remove redundant operations from decoder reset() method (5b531b7)

  BREAKING CHANGE: API change for reset() method.

Bundle Size Reductions

• Change method names and some other small changes (5b531b7)

0.5.0 (2025-11-19)

Features

• Add support for decoding interlaced videos (#33) (5aa71a1)
• Add video flags for scaling and grayscale to the decoder’s header data (5aa71a1)

Bundle Size Reductions

• Reduce lengths of error messages (5aa71a1)
• Replace internal runtime checks with type checks where possible (5aa71a1)

Robustness

• Limit number of audio channels to a reasonable value (8) to guard against corrupted files (5aa71a1)

0.4.0 (2025-11-18)

Features

• Add demo with an example video player and documentation (e747e37), closes #26
• Add support for CSS view transitions (e747e37)

Bundle Size Reductions

• Optimize build settings to reduce the minified size of the decoder (e747e37)

0.3.0 (2025-11-14)

Features

• Handle unsupported BIK versions and indicate status via the isSupported property (818ae04)

0.2.0 (2025-11-13)

Features

• Add skipFrames() method for skipping multiple decoded frames (6d564dd)

Regression testing has also been improved significantly.

0.1.0 (2025-11-12)

Features

• Add initial implementation of the .bik video decoder (124c3b9)

  Consists of a stream reader, header parser, demuxer, and audio/video decoders. Version 1 of the .bik video format is supported, except for revision b. DCT and DFT compressed audio are both supported. Each outputted frame combines a single video frame with a chunk of decoded audio.