View source for H.264

H.264/MPEG-4 AVC is a standard for video compression. DivX® 7 is based on the H.264 standard, as well as Apple QuickTime 7.  H.264 delivers the same quality as MPEG-2 at a third to half the data rate and up to four times the frame size of MPEG-4 Part 2 at the same data rate.

H.264 is most popular for its use on Blu-ray Disc, HD DVD and videos from the iTunes Store.

AVC and H.264 are synonymous. The standard is known by the full names "ISO/IEC 14496-10" and "ITU-T Recommendation H.264". In addition, a number of alternate names are used (or have been) in reference to this standard. These include:

* MPEG-4 part 10
* MPEG-4 AVC
* AVC
* MPEG-4 (in the broadcasting world MPEG4 part 2 is ignored)
* H.264
* JVT (Joint Video Team, nowadays rarely used referring to actual spec)
* H.26L (early drafts went by this name) 

A competing and alternative to AVC/H.264 is Microsoft's VC-1.  
* VC-1 is supposed to be used for HD-DVD
* HD-DVD is a competitor with BlueRay
* BlueRay already uses AVC/H.264

== Compression ==

H.264 is quickly becoming the most popular compression method for CCTV, DVR, and streaming because it provides high resolution video quality from the smallest amount of video data required.  Less bandwidth and less storage is required for maximum resolution video.  H.264 delivers the same quality as MPEG-2 at a third to half the data rate and up to four times the frame size of MPEG-4 Part 2 at the same data rate.

[[File:h264compressionandbandwidth.jpg]]

== Available AVC/H.264 Codecs ==

AVC/H.264 implementations are available atm already from x264, Nero, Apple, Sorenson, Elecard, Moonlight, VSS, mpegable, Envivio, Hdot264 (binary), DSPR, JM (reference software) (binary), ffmpeg, Philips, FastVDO, Skal, Sony and many more 

=== Encoders ===

* x264: the first publically available High Profile encoder, opensource (GPL) (Source), available for VFW: x264vfw, ffdshow (output .avi), as commandline: x264cli (outputs .mp4, .mkv, raw), mencoder (outputs raw, .avi) (Doom9's [[MeGUI]]) or ffmpeg
x264 supports 2pass, CABAC, Loop, multiple B-Frames, B-References, multiple Reference Frames, 4x4 P-Frame, 8x8 B-Frame Blocksizes, anamorphic signalling and High Profile: 8x8 dct and intra prediction, lossless and custom quant matrices
* NeroDigital AVC: useable in Nero Recode2, outputs .mp4
ND AVC supports 2pass, CABAC, (adaptive) Loop, multiple B-Frames, mulitple Reference Frames, weighted prediction, 8x8 P-Frame Blocksizes, 16x16 B-Frame Blocksizes, Adaptive Quant. (Psy High)
* Sorenson: useable in Sorenson Squeeze 4, outputs .mp4,
Sorenson supports 2pass, max 2 B-Frames, B-References, Loop and multiple Slices
* Apple: useable in Quicktime 7, outputs .mp4, .3gp and .mov, totally slow
uses 2pass, max 1 B-frame, Loop (0,0), P8x8,B8x8,I4x4, Adapt. Quant, 5 Slices, no CABAC, no Weighted Pred., no multi Ref.
* JM: The AVC Reference Software offers in v9.3 Main and High Profile: B/SP-Frames, CABAC, Loop Filter, 4x4 Blocksizes, multiple Reference Frames, Adaptive Quant, Error Resilience, RDO, Lossless Coding, Custom Quants, Rate Control aso...
* Hdot264: opensource (GPL) VFW version of the reference software by doom9 member charact3r, still based on a very old version of the reference (JM 4.0c)
* VSS: free preview VFW Encoder (limited to 5 days), based on the reference encoder
* Elecard: useable in Elecard Mobile Converter, outputs .mp4 and MainConcept's v2 encoder, outputs .264 and .mpg PS/TS
not publically available anymore:
* Moonlight: useable in Moonlight's OneClick Compressor v1.1 and CyberLink's PowerEncoder, outputs .mpg
Moonlight supports 1pass (VBR/CBR/Fixed Quants), CABAC, Loop, 2 B-Frames, 8x8 P-Frame Sizes, Adapt. Quant, PAR, Interlacing
* MainConcept: was useable in the v1 encoder (adds a watermark), outputs .264 and .mpg PS/TS
1pass (CBR/VBR/fixed Quants), P-Frame Reorder, CABAC, Loop, Multiple B-Vops, Multiple Ref, 4x4 P-Frame Sizes, PAR, RDO
* mpegable: offered for some time a free VFW Encoder (not based on the reference), doesnt handle YV12
mpegable supports 1pass (fixed quants) uses P-Frames only, 8x8 P-Frame Blocksizes, CAVLC only, Loop
* Envivio: useable in 4Coder, outputs .mp4

=== Decoders (comparison) ===

* ffmpeg: opensource (LGPL), used e.g. in ffdshow (VFW and DShow decoder), [[MPlayer]] and VideoLAN
supports B-Frames, B-References, CABAC, Loop, Weighted Prediction and High Profile (8x8 dct and intra prediction, lossless)
* CoreAVC
* Apple: AVC decoding inside Quicktime 7, supports .mp4/.mov, very slow
supports only 1 B-Frame, CABAC, Loop but no mixed references, multiple B-frames and no interlacing
* NeroDigital AVC: DShow Decoder and .mp4 Parser coming with Recode2
supports Main and High Profile
* VSS: preview VFW Decoder (limited to 5 days) and a DShow Decoder (limited to 30 days)
VSS DShow supports .avi (with VSSH and H264 fourcc), CABAC, Loop, B-Frames
* Elecard: available in Elecard's MPEG Player and MainConcept's v2 encoder
* Envivio: not freely available AVC DShow decoder called EnvivioTV, handling AVC in .mp4 (since 2.0, current version: 2-1-181)
* Philips: DShow AVC decoder freely available in the AVC Alliance player (handles raw AVC only)
* FastVDO: time limited (5 minutes per video) High Profile DShow Decoder
not publically available anymore:
* Moonlight: DShow decoder/Parser handling AVC in .mpg, .mp4 and .264 available in Moonlight's MPEG Player v3.0
supports Main and High Profile
* MainConcept: the v1 preview offered a free DShow AVC decoder (adds watermark) and Parser handling AVC as .mpg PS/TS
* mpegable: offered for some time a free VFW decoder (usable also in DShow), supports .avi (with DAVC fourcc)
* Basic AVC Decoder in C, for an university project 
* Pegasus: not really compliant DShow AVC decoder

== Software to Encode to H.264 Video ==

There is surprisingly little straight forward quality software available.

Identify your need.  Some software is oriented towards streaming and flash presentation, while other is towards offline video file creation.

If you want to convert DVD to H.264:  [[FairUse Wizard]], [[MeGUI]], Gordian Knot

From the commercial solutions: Nero Recode, Quicktime Pro 

Nero Recode is a very good choice. However it is not worth it to buy Nero just to get the H.264 encoder. If you already have Nero 7, give it a try and compare it against x264 yourself. Quicktime Pro is very, very slow at the moment, therefore we don't suggest using it.

<big>ALERT: [[Super Encoder]] is Malware/Spyware/Virus DO NOT INSTALL SUPER.  As of 2012 the developers have added payloads to Super that force install malware to your PC.  </big>

source: [http://www.dvd-guides.com/content/view/143/59/ H.264 FAQ & Basic Conversion Guide]

== Playing H.264 Video ==

The latest version of ffdshow supports H264 playback. Remember, ffdshow is a DirectShow filter so after you install it you'll be able to play H264 in most video players you already have installed, including Windows Media Player. Alternatively you can download VideoLAN player. It can play H264 without need of any codec or DirectShow filter. Nero Showtime and Apple Quicktime players support H264 too, but their support is not so great for all formats (they play better H264 content that was created using Nero Recode or Quicktime Pro) so I don't suggest using them for general H264 playback. Generally most players or codec packs nowadays include H264 support so you shouldn't have any problems. For Linux [[Mplayer]] offers excellent playback as well as Xine and VLC. Totem (using Gstreamer as a backend) seems to have many troubles however, especially low speeds.

source: [http://www.dvd-guides.com/content/view/143/59/ H.264 FAQ & Basic Conversion Guide]

* [[MPlayer]]  will render both video and sound for H.264 without the need for external codecs
* VLAN ( [[VideoLAN Player]] ) will render video and sound for H.264 without the need for external codecs

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== The Best Codec of 2005 ==

x264 won the best Codec of 2005 by doom9 where they had a shootout between many popular video codecs.  
* [http://www.doom9.org/index.html?/codecs-final-105-1.htm Codec shoot-out 2005 - Final]

In their testing they found the following:

FIRST PLACE: x264 (a free open source H.264 codec/encoder) - Tied with Ateme's encoder on two occasions, and surpassing its most fierce competitor in SPR. 

SECOND PLACE: Ateme's encoder left a good impression in the Matrix 3 test in the main round, sharing the first place with x264 in two tests. However, the results during night scene video shows that effectively it comes in second in the big picture.

THIRD PLACE: XviD is the dominant ASP codec. It continues to surpass DivX in the tested movies.

FOURTH PLACE: DivX 6.1 came in last in two out of three tests, and last tied with XviD in the third test. There's no doubt that DivX has made significant advancements and is getting closer to XviD, but it's still not there.  Soon it won't matter as XviD and DivX are both ASP codecs, and ASP will soon be outdated.

* x264
* Ateme
* XviD
* DivX

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[[Category:Computer_Technology]]
[[Category:Software]]
[[Category:Digital Video]]
[[Category:Desktop Software]]