x264 Video Codec r1713 | 5.88 MB

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

MPEG-4 is a broad Open Standard developed by the Moving Picture Experts Group (MPEG), a operating 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 completely sorts of audio/video compression formats and much more

By its nature the MPEG-4 Standard doesn’t aim at standardizing one in posse product (e.g. something comparable to DVD) but covers a tolerant range of Sub-Standards, which Product Providers can choose from to follow, according to what they need for their product

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

Note: x264 is stagnant considered alpha, so errors can (and will) occur!

Here are some key features of “x264 Video Codec”:

· CAVLC/CABAC
· Multi-references
· Intra: wholly macroblock types (16×16, 8×8, and 4×4 with all predictions)
· Inter P: every part of partitions (from 16×16 down to 4×4)
· Inter B: partitions from 16×16 the floor to 8×8 (including skip/direct)
· Ratecontrol: optional VBV, single or multipass ABR, fixed quantizer
· Scene cut detection
· Adaptive B-frame placement
· B-frames being of the kind which references / arbitrary frame order
· 8×8 and 4×4 adaptive spatial transform
· Lossless degree
· Custom quantization matrices
· Parallel encoding of multiple slices
· Interlacing

What’s New in This Release:

· Add act for level 1b
· This level is a stupid hack in the H.264 spec, for a like rea~n it’s a stupid hack in x264 too.
· Since level is some integer, calling applications need to set level_idc=9 to use it.
· String-based choice handling will accept “1b” just fine though, so CLI users don’t have to worry.

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