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A systematic test setting for evaluation consisting of different compression codices has been developed by the HfG Karlsruhe. On the base of trial recordings, transformation parameters for shutter and grid (Moiré) effect, digital artifacts, digital compression traces in color gradients and handling with parasitic frequencies was obtained descriptive examples which can be also tested and downloaded on this page.
Depending on the internal aesthetical structure of a video tape are recommended different digitisation modes and codices.
The HfG Karlsruhe has in specific produced some video material for codec tests in DigitalBeta format (Digital Beta Cassette).
The source material was first encoded in → Huffyuv. Huffyuv is a compression algorithm by Ben Rudiak-Gould, which enables a very fast, loss-free Win32 compression. On the basis of a bit-to-bit compression the codec ensures original takes with no color space conversion.
- Find → here all video materials.
To achieve a better understanding about the results of different compression modes, the HfG has executed a systematic test setting for the evaluation of compression codices. The special shot footage determines the parameters for the compression of the zoom, structure, pan (normal, slow and fast pan), architecture, colours, persons, focus, water and leaves.
[Jürgen Enge / Jesús Muñoz Morcillo / Matze Schmidt]
Following cinematic settings were used as test sequences
In order to present results in an appropiate way was set up a lab-like arrangement: an effort was made to shoot sequences which were comparable to the effects which appear in the video artworks of the late 70ies and the 80ies.
Demonstrative examples prove this. The following shots were used as test footage:
- Grid with pan (# gitter_schwenk)
- Sign: letters on paper filmed (# kein_schlaf_kein_code)
- Pan in staircase (# schwenks_treppenhaus)
- Staircase – static and with pan (# treppe_juergen_statische_und_schwenk_mit_licht)
- Dove (# taube)
- Slow pan with zoom (# teleschwenks_langsam)
- Fast pan with zoom (# teleschwenks_schnell)
- Blurred grid (# unschaerfen_gitter)
- Water and leaves (# wasser_und_blaetter)
Depending on the internal aesthetical structure of a video, different digitisation modes and codices are recommended. The HfG Karlsruhe has produced some video footage for codec tests. The original takes have been recorded with a DigitalBeta Camera (DitalBeta Cassette). The source material was first encoded in Huffyuv. Huffyuv is a compression algorithm by Ben Rudiak-Gould, which enables a very fast, lossless Win32 compression. On the basis of a bit-to-bit compression the codec ensures that the colour of the original take is not changed.
Huffyuv is published under the terms of the GPL. The Huffyuv video files were then encoded with several common codices such as mpeg4, Quicktime6 apple cinepak, Quicktime6 on2 vp3 video compressor, Quicktime6 sorenson video 3, Quicktime6 zygovideo pro, mpeg2, windows media 9, DivX, R9, Quicktime6 apple bitmap and recently updated with H264.
The codec tests result in a wide array of video files varying in sizes and quality that may support the OASIS Archive group in questions of the preservation of original videos and video files and streaming of video data.
Following Codecs were tested
Base material: Huffyuv
Codecs: Avid Quicktime Codecs, Windows Media 9 Codec, DivX Player + Codec (Bundle), Real Media Codecs, Mpeg 2 Codec, Mpeg 4 Codec, QuickTime 6 on2 vp3 Video Codec, QuickTime Codecs Bundle [QuickTime Alternative 1.70]
Following Players were used
VLC Player, QuickTime 7 Player (NEW), Quicktime 6 Player, DivX Player + Codec (Bundle), Real Media Player 9, Real Media Player 10 Player (NEW), Windows Media Player 9.
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