Free 4x4 software for windows

The code is written from scratch by Laurent Aimar, Loren Merritt, Eric Petit(OS X), Min Chen (vfw/asm), Justin Clay(vfw), M?ns Rullg?rd, Christian Heine (asm), and Alex Izvorski (asm).
Note: x264 is still considered alpha, so errors can (and will) occur!

Main features:
- CAVLC/CABAC
- Multi-references
- Intra: all macroblock types (16x16, 8x8, and 4x4 with all predictions)
- Inter P: all partitions (from 16x16 down to 4x4)
- Inter B: partitions from 16x16 down to 8x8 (including skip/direct)
- Ratecontrol: optional VBV, single or multipass ABR, constant quantizer
- Scene cut detection
- Adaptive B-frame placement
- B-frames as references / arbitrary frame order
- 8x8 and 4x4 adaptive spatial transform
- Lossless mode
- Custom quantization matrices
- Parallel encoding of multiple slices
- Interlacing

Enhancements:
- Check whether echo -n works, otherwise try printf (fixes build on current OS X 10.5)

The code is written from scratch by Laurent Aimar, Loren Merritt, Eric Petit(OS X), Min Chen (vfw/asm), Justin Clay(vfw), M?ns Rullg?rd, Christian Heine (asm), and Alex Izvorski (asm).
Note: x264 is still considered alpha, so errors can (and will) occur!

Main features:
- CAVLC/CABAC
- Multi-references
- Intra: all macroblock types (16x16, 8x8, and 4x4 with all predictions)
- Inter P: all partitions (from 16x16 down to 4x4)
- Inter B: partitions from 16x16 down to 8x8 (including skip/direct)
- Ratecontrol: optional VBV, single or multipass ABR, constant quantizer
- Scene cut detection
- Adaptive B-frame placement
- B-frames as references / arbitrary frame order
- 8x8 and 4x4 adaptive spatial transform
- Lossless mode
- Custom quantization matrices
- Parallel encoding of multiple slices
- Interlacing

Enhancements:
- Resolve possible crash in bime, improve the fix in r985

The code is written from scratch by Laurent Aimar, Loren Merritt, Eric Petit(OS X), Min Chen (vfw/asm), Justin Clay(vfw), M?ns Rullg?rd, Christian Heine (asm), and Alex Izvorski (asm).
Note: x264 is still considered alpha, so errors can (and will) occur!

Main features:
- CAVLC/CABAC
- Multi-references
- Intra: all macroblock types (16x16, 8x8, and 4x4 with all predictions)
- Inter P: all partitions (from 16x16 down to 4x4)
- Inter B: partitions from 16x16 down to 8x8 (including skip/direct)
- Ratecontrol: optional VBV, single or multipass ABR, constant quantizer
- Scene cut detection
- Adaptive B-frame placement
- B-frames as references / arbitrary frame order
- 8x8 and 4x4 adaptive spatial transform
- Lossless mode
- Custom quantization matrices
- Parallel encoding of multiple slices
- Interlacing

Enhancements:
- Replace High 4:4:4 profile lossless with High 4:4:4 Predictive. This improves lossless compression by about 4-25% depending on source. The benefit is generally higher for intra-only compression. Also add support for 8x8dct and i8x8 blocks in lossless mode; this improves compression very slightly. In some rare cases 8x8dct can hurt compression in lossless mode, but its usually helpful, albeit marginally. Note that 8x8dct is only available with CABAC as it is never useful with CAVLC.
- High 4:4:4 Predictive replaced the previous profile in a 2007 revision to the H.264 standard. The only known compliant decoder for this profile is the latest version of CoreAVC.

x264 Video Codec r1181 won't make you disappointed cause it encodes H264/AVC video streams.

Major Features:

1. CAVLC/CABAC
2. Multi-references
3. Intra: all macroblock types (16x16, 8x8, and 4x4 with all predictions)
4. Inter P: all partitions (from 16x16 down to 4x4)
5. Inter B: partitions from 16x16 down to 8x8 (including skip/direct)
6. Ratecontrol: optional VBV, single or multipass ABR, constant quantizer
7. Scene cut detection
8. Adaptive B-frame placement
9. B-frames as references / arbitrary frame order
10. 8x8 and 4x4 adaptive spatial transform
11. Lossless mode
12. Custom quantization matrices
13. Parallel encoding of multiple slices
14. Interlacing

Enhancements

• Merge array_non_zero into zigzag_sub
• Faster lossless, cleaner code.
• SSSE3 version of zigzag_sub_4x4_field, faster lossless interlaced coding.

Major Features:

1. 8x8 and 4x4 adaptive spatial transform
2. Adaptive B-frame placement
3. B-frames as references / arbitrary frame order
4. CAVLC/CABAC entropy coding
5. Custom quantization matrices
6. Intra: all macroblock types (16x16, 8x8, 4x4, and PCM with all predictions)
7. Inter P: all partitions (from 16x16 down to 4x4)
8. Inter B: partitions from 16x16 down to 8x8 (including skip/direct)
9. Interlacing (MBAFF)
10. Multiple reference frames
11. Ratecontrol: constant quantizer, constant quality, single or multipass ABR, optional VBV
12. Scenecut detection
13. Spatial and temporal direct mode in B-frames, adaptive mode selection
14. Parallel encoding on multiple CPUs
15. Predictive lossless mode
16. Psy optimizations for detail retention (adaptive quantization, psy-RD, psy-trellis)
17. Zones for arbitrarily adjusting bitrate distribution

Enhancements:

• Change all dct arrays to 1d.
• The C standard doesn't allow you to iterate 1-dimensionally over 2d arrays, and nothing other than the dsp functions themselves cares about the 2dness of dct.
• This fixes a miscompilation in x264_mb_optimize_chroma_dc.