منابع مشابه
Transcoding of MPEG bitstreams
This paper discusses the problem of transcoding as it may occur in, for instance, the following situation. Suppose a satellite transmits an MPEG-compressed video signal at say 9 Mbit/s. This signal must be relayed at a cable head end. However, since the cable capacity is only limited, the cable head end will want to relay this incoming signal at a lower bit-rate of, say, 5 Mbit/s. The problem i...
متن کاملJoint transcoding of multiple MPEG video bitstreams
This paper addresses the problem of bit-rate conversion of a previously compressed video. We provide an MPEG joint transcoder for transcoding several video bitstreams simultaneously. We show that joint transcoding reduces the quality variation between multiple video sequences, as compared to independently transcoding each sequence at a fixed bit rate. Hence, joint transcoding results in a bette...
متن کاملCompressed Domain Transcoding of MPEG
Current video compression formats optimize for either compression or editing. For example, motion-JPEG (MJPEG) provides excellent random access and moderate overall compression, while MPEG optimizes for compression at the expense of random access. Converting from one format to another, a process called transcoding, is often desirable over the life of a video segment. This paper shows how to tra...
متن کاملMPEG-4 to MPEG-2 HDTV Network Video Transcoding
Much to the surprise of many cable operators, the industry's MPEG-4 era appears to have abruptly begun. Due to HBO's startling June announcement that it will begin beaming all 26 of its HBO and Cinemax multiplex channels in HDTV using the far more bandwidth-efficient video compression format, MSOs suddenly face the daunting challenge of figuring out how to carry all that MPEG-4 programming from...
متن کاملSecure Embedding of Forensic Watermarks in MPEG-2 Bitstreams
Secure watermark embedding allows to securely embed a watermark into a piece of content at an untrusted user device without compromising the security of the watermark key, the watermark or the original. In this paper, we show how secure watermark embedding for MPEG-2 compressed video streams can be implemented by combining traditional watermarking schemes with techniques from partial encryption.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Signal Processing: Image Communication
سال: 1996
ISSN: 0923-5965
DOI: 10.1016/0923-5965(95)00067-4