Abstract: A multimedia packet re-multiplexer system having a plurality of multimedia sources, each multimedia source sending incoming multimedia packets, each packet having a header which includes a packet identifier (PID) to determine the packet type. The system includes an interface multiplexer (mux) for periodically scanning the multimedia sources for the incoming packets. The system also includes a main storage device for storing each incoming packet, a secondary storage device having a cut-through mechanism for storing the header of each incoming packet, an input classifier for selecting a process for each packet stored in the main storage device, in accordance with the corresponding header from the secondary storage device.

Abstract: A transcoder system for compressed digital video bitstreams comprising the three frame types: I-frames, P-frames and B-frames, is disclosed. The system includes a picture reader decoder to ascertain and select the type, size or estimated quality of each frame, or the DSP processing power of each frame prior to transcoding. The system also includes a T1 transcoder for processing B-frames and a picture decision block for separating all I-frames and P-frames from B-frames in the case where the frame type is selected. Another component is a remerge block for recombining the output of B-frames from said T1 transcoder with the untranscoded P-frames and I-frames into a reconstituted output bitstream, such that only the B-frames are processed by the much faster T1 transcoder, thereby achieving substantial improvement in the transcoding throughput speed.

Abstract: A transcoder system for compressed digital video bitstreams comprising three frame types: I-frames, P-frames and B-frames. The system includes a picture reader decoder to ascertain the type of each frame prior to transcoding. The system also includes a T2 transcoder for processing I-frames and P-frames, possibly excepting the last P-frame of a group-of-frames (GOP), a T1 transcoder for processing B-frames and (optionally) the last P-frame of a GOP and a picture decision block for separating all frames into I-frames and P-frames, possibly excepting the last P-frame of a GOP for processing by the T2 transcoder and B-frames and (optionally) the last P-frame of a GOP for processing by said T1 transcoder.

Abstract: A system for compressed digital video bitstreams, in which an I-frame may precede a plurality of P-frames slices, wherein the system includes an encoder to encode the bits for each successive P-frame slice. The system also includes a decoder buffer, where the bits enter at a fixed rate and a decoder, which uses the extracted bits to decode each frame and display each frame. The delay is chosen at a fixed rate between 10 msec and 100 msec.