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Perceived Audiovisual Quality of Low-Bitrate Multimedia Content Stefan Winkler, Christof Faller IEEE Transactions on Multimedia vol. 8, no. 5, pp. 973-980,

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Presentation on theme: "Perceived Audiovisual Quality of Low-Bitrate Multimedia Content Stefan Winkler, Christof Faller IEEE Transactions on Multimedia vol. 8, no. 5, pp. 973-980,"— Presentation transcript:

1 Perceived Audiovisual Quality of Low-Bitrate Multimedia Content Stefan Winkler, Christof Faller IEEE Transactions on Multimedia vol. 8, no. 5, pp , Oct

2 Test Overview Mobile video Low bitrates, small-size clips 6 AV source clips (QCIF, ~8s each) NameVideoAudio BuildingsSlow pan across city skylineOrchestral background music ConversationCamera switching between woman and man (head-and-shoulders) Male and female voice FootballAmerican football (VQEG)Crowd cheering and chanting, female commentator Music videoMusic video clipRock music with vocals Trailer 1Action movie trailer; scene cuts, high motion Theme music, voice-over Trailer 2Romance movie trailer with credits; scene cuts Theme music, voice-over

3 Test Setup H.264 encoder Video decoder AV source sequence Codec, bitrate, frame rate AAC-LC encoder Audio decoder AV test sequence Bitrate, channels, sampling rate Audio Video 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 TotalVideoAudio 40 kb/s24 kb/s16 kb/s 40 kb/s32 kb/s 8 kb/s 56 kb/s24 kb/s32 kb/s 56 kb/s32 kb/s24 kb/s 56 kb/s40 kb/s16 kb/s 56 kb/s48 kb/s 8 kb/s 72 kb/s40 kb/s32 kb/s 72 kb/s48 kb/s24 kb/s CodecFrame rateBitrate H.2648 fps24 kb/s H.2648 fps32 kb/s H.2648 fps40 kb/s H.2648 fps48 kb/s H.2638 fps48 kb/s MPEG-48 fps48 kb/s H fps24 kb/s H fps32 kb/s H fps40 kb/s H fps48 kb/s ChannelsSamplingBitrate mono 8 kHz 8 kb/s mono16 kHz16 kb/s mono22 kHz24 kb/s mono32 kHz32 kb/s mono22 kHz32 kb/s stereo22 kHz32 kb/s stereo16 kHz32 kb/s Video Audio Audiovisual

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

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

7 Subjective Data


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