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Version: r1564
Size: 6,07 MB
OS: Windows(All)XP/Vista/7
License: GPL / FREE
Developer: VideoLAN team.

x264 Video Codec is a freeware library that will enable users to easily encode H264/AVC video streams. The code is written by Laurent Aimar, Eric Petit(OS X), Min Chen (vfw/nasm), Justin Clay(vfw), Måns Rullgård and Loren Merritt from scratch.

The latter is used by many other interfaces, such as HandBrake and FFmpeg.

MPEG-4 (ISO 14496) is a broad Open Standard developed by the Moving Picture Experts Group (MPEG), a working group of the International Organization for Standardization (ISO) which also did the well known MPEG-1 (MP3, VCD) and MPEG-2 (DVD, SVCD) Standards, standardizing all sorts of audio/video compression formats and much more.

By its nature the MPEG-4 Standard doesnt aim at standardizing one potential product (eg something comparable to DVD) but covers a broad range of Sub-Standards, which Product Providers can choose from to follow, according to what they need for their product

The MPEG-4 Standard, as mentioned, is divided into many different sub-standards, where for us users on Doom9 the following parts might be of major interest:
- ISO 14496-1 (Systems), Animation/Interactivity (like DVD Menus)
- ISO 14496-2 (Video), e.g. Advanced Simple Profile (ASP), as followed by XviD, DivX5, 3ivx…
- ISO 14496-3 (Audio), Advanced Audio Coding (AAC)
- ISO 14496-10 (Video), Advanced Video Coding (AVC), also known as H.264
- ISO 14496-14 (Container), MP4 container format (uses the .mp4 extension)
- ISO 14496-17 (Subtitles), MPEG-4 Timed Text subtitle format

The AVC/H.264 standard defines four different Profiles: Baseline, Main, Extended and High Profile:
- Baseline Profile offers I/P-Frames, supports progressive and CAVLC only
- Extended Profile offers I/P/B/SP/SI-Frames, supports progressive and CAVLC only
- Main Profile offers I/P/B-Frames, supports progressive and interlaced, and offers CAVLC or CABAC
- High Profile (aka FRExt) adds to Main Profile: 8×8 intra prediction, custom quants, lossless video coding, more yuv formats (4:4:4…)

Key Features of x264 Video Codec:

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

New in This Release:

- Fix mv predictor clipping on non-x86 (regression in r1548)

x264 Video Codec, 5.0 out of 5 based on 3 ratings