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Subjective Assessment of Low-Bitrate Mobile Video Quality

This study examines the perceived audiovisual quality of low-bitrate multimedia content for mobile video applications. The research involves testing with six audiovisual source clips at QCIF resolution and ~8-second duration, using H.264 and other codecs, different frame rates, and audio configurations. The subjective assessment method used is Absolute Category Rating (ACR) with viewers rating quality on a discrete scale of 0-10 in three test parts. Data collected from 24 non-expert viewers provide insights into the perceived quality of the multimedia content.

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Subjective Assessment of Low-Bitrate Mobile Video Quality

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  1. Perceived Audiovisual Qualityof Low-Bitrate Multimedia Content Stefan Winkler, Christof Faller IEEE Transactions on Multimediavol. 8, no. 5, pp. 973-980, Oct. 2006 http://stefan.winkler.net/publications.html

  2. Test Overview • Mobile video • Low bitrates, small-size clips • 6 AV source clips (QCIF, ~8s each)

  3. Test Setup Codec, bitrate,frame rate Video H.264 encoder Videodecoder AV sourcesequence AV testsequence AAC-LCencoder Audiodecoder Audio Bitrate, channels, sampling rate Video:H.264, H.263, MPEG-4 codecs Frame rates: 8 fps, 15 fps Audio: Mono/stereo Sampling rates: 8–32 kHz

  4. Test Conditions Audio Video Audiovisual

  5. 17” LCD screen Comfortable viewing distance Sound-proof room Studio headphones 30 min. test session,in 3 parts with breaks 24 non-expert viewers Subjective Assessment

  6. Subjective Assessment • Method: Absolute Category Rating (ACR) • Viewers rate quality on discrete scale (0-10) • 3-part test session Test sequence Vote

  7. Subjective Data

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