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22 January 1999 Compressed-domain reverse play of MPEG video streams
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Proceedings Volume 3528, Multimedia Systems and Applications; (1999)
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States
We present several compressed-domain methods for reverse- play transcoding of MPEG video streams. A reverse-play transcoder takes any original MPEG IPB bitstream as input and creates an output MPEG IPB bitstream which, when decoded by a generic MPEG decoder, displays the original video games in reverse order. A baseline spatial-domain method requires decoding the MPEG bitstream, storing and reordering the decoded video frames, and re-encoding the reordered video. The proposed compressed-domain transcoding methods achieve an order of magnitude reduction in computational complexity over the baseline spatial-domain approach. Much of the savings are achieved by using the forward motion vector fields available in the forward-play MPEG bitstream to efficiently generate the reverse motion vector fields used in the reverse-play MPEG bitstream. Furthermore, the storage requirements of the compressed-domain methods are reduced and the resulting image quality is within 0.6 dB of the baseline spatial-domain approach for a difficult highly detailed computer-generated video sequence. For more typical video sequences, the resulting image quality is even closer to the baseline spatial-domain approach.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Susie J. Wee and Bhaskaran Vasudev "Compressed-domain reverse play of MPEG video streams", Proc. SPIE 3528, Multimedia Systems and Applications, (22 January 1999);


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