The popularity of low-delayvideo applications dramatically increased over the last years due to a rising demand for real-time video content (such as video conferencing or video surveillance), and also due to the incr...
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ISBN:
(纸本)9781628412444
The popularity of low-delayvideo applications dramatically increased over the last years due to a rising demand for real-time video content (such as video conferencing or video surveillance), and also due to the increasing availability of relatively inexpensive heterogeneous devices (such as smartphones and tablets). To this end, this work presents a comparative assessment of the two latest videocoding standards: H.265/MPEG-HEVC (High-Efficiency videocoding), H.264/MPEG-AVC (Advanced videocoding), and also of the VP9 proprietary videocoding scheme. For evaluating H.264/MPEG-AVC, an open-source x264 encoder was selected, which has a multi-pass encoding mode, similarly to VP9. According to experimental results, which were obtained by using similar low-delay configurations for all three examined representative encoders, it was observed that H.265/MPEG-HEVC provides significant average bit-rate savings of 32.5%, and 40.8%, relative to VP9 and x264 for the 1-pass encoding, and average bit-rate savings of 32.6%, and 42.2% for the 2-pass encoding, respectively. On the other hand, compared to the x264 encoder, typical low-delay encoding times of the VP9 encoder, are about 2,000 times higher for the 1-pass encoding, and are about 400 times higher for the 2-pass encoding.
An intra refresh algorithm is presented which enables low-delayvideo communication at the efficiency of standard IP-coding schemes. It guarantees a complete recovery of erroneous transmission within a defined time in...
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An intra refresh algorithm is presented which enables low-delayvideo communication at the efficiency of standard IP-coding schemes. It guarantees a complete recovery of erroneous transmission within a defined time interval at low computational complexity.(1)
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