[x264-devel] [Mp4-tech] CALL FOR MPEG4-AVC/H.264 CODECS (fwd)

[Tuukka Toivonen]

I thought it might be nice to forward this message here too.

I believe these people are aware of x264, but might not know
the best encoding options.

According to my experiments, the best safe encoding options are

--bframes 3
--no-b-adapt
--b-pyramid
--ref 14
--pbratio 1.5
--analyse all
--direct temporal
--me 3
--merange 24
--subme 6
--8x8dct

- "--direct spatial" would give higher performance in PSNR,
  but I'm not sure if it is usable, so I wouldn't recommend
  using it yet. There have been some fixes in x264, but
  I wasn't able to verify if they fixed the problem as
  I haven't been able to decode .264 into raw yuv with
  recent Mencoder cvs versions :(
- Larger "--ref" might be slightly better but possibly with
  lesser compatibility
- I don't have yet recommendations for "balanced" (ie. faster)
  coding options.
- I haven't mailed the people below (maybe some developer
  would like to do it--it would be great to have an independent
  comparison of x264 to other encoders)

---------- Forwarded message ----------
Date: Sun, 28 Aug 2005 02:46:40 +0400
From: Dmitriy Vatolin <dmitriy at graphics.cs.msu.ru>
To: mp4-tech at lists.mpegif.org
Subject: [Mp4-tech] CALL FOR MPEG4-AVC/H.264 CODECS

Hello!

    Please, forward this information to codecs developers!

================================================================
             CALL FOR MPEG4-AVC/H.264 CODECS
        Second Annual H.264 video codec comparison
================================================================

For people, who make real research in field of high-end video compression

Important Dates
---------------

* September, 10  preliminary registration and settling of all formal issues
* September, 20  deadline of codec receipt with required presets
* September, 25  notification of codecs acceptance for tests notification


Enhancements from Previous H.264/AVC Comparison
-----------------------------------------------

* Measuring will be performed with extended metrics set: PSNR, SSIM, VQM
* Two codec presets will be compared:  Maximum quality ,  Balanced  (speed)
* For each preset both speed and quality will be measured


Codec Requirements
------------------

* Codec should be H.264/AVC Main Profile codec
* Codec should allow to set arbitrary bitrate of resulted sequence
* 3 variants of codec interface are possible:
   * Console codec version (with batch processing support H bitrate and file names must be assigned from command line
   * Video for Windows Codec with correct state saving (batch processing support)
   * Direct Show filter. In this case software for batch processing should be provided
* Codec should open and save *.yuv or *.avi (YUV colorspace) files
* Result video sequences should be opened with standard methods


Comparison Rules
----------------

* All measurements will be produced by MSU Video Quality Measurement
  Tool( http://www.compression.ru/video/quality_measure/video_measurement_tool_en.html )
* Codec options for  Maximum quality  and  Balanced  presets should be provided by codec authors. If these options won“tnot be provided, default options will be used
* Verification of comparison results is possible for codec authors before comparison publication
* Codec authors can delete all information about their codec from comparison document. In this case comparison authors can mention about this codec in public document without any received results

See Previous H.264/AVC comparison for other rules and details.


Useful Links
------------

* Previous H.264/AVC comparison
  http://www.compression.ru/video/codec_comparison/mpeg-4_avc_h264_en.html
* MPEG-4 SP/ASP comparison
  http://www.compression.ru/video/codec_comparison/mpeg-4_en.html
* Lossless codecs comparison
  http://www.compression.ru/video/codec_comparison/lossless_codecs_en.html


Contact info
------------

   Please contact us video at graphics.cs.msu.ru

================================================================

-- 
Best regards,
 Dmitriy                          mailto:dmitriy at graphics.cs.msu.ru

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