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We present a novel arbitrary spatial downsizing method in H.264 to MPEG4 simple profile transcoder. Using median filtering and scaling of input H.264 4times4 block level motion vectors, downsizing module generates target resolution compatible 4times4 block level motion vector, which is fed at MPEG4 encoder to generate MPEG4 compatible final 16times16 or 8times8 block level motion vector. Downsizing...
Video transcoding is becoming nowadays more and more popular, due to the necessity to cope with several different encoding standards, available bandwidth and decoder capabilities. In this paper we are going to discuss the strategy for implementation of a buffer-based rate control algorithm (constant bit rate) in a MPEG2 to MPEG4 Simple profile transcoder which is over performing during scene changes,...
This paper describes a new transcoding algorithm, able to transcode any coded (e.g. MPEG-2) bit-stream into an H.264 sequence with arbitrary spatial resolution change. The visual quality at a given input and output bit-rate is close or equal to full decoding followed by a full encoding (0.5 dB-to-2 dB less in PSNR than that of re-encoding the stream at the target resolution) while, from the complexity...
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