Abstract: For encoding externally input AV signal to MPEG-TS that enables quickly conversion from MPEG-TS to MPEG-PS, data unit (Multiplexing Unit) is defined which includes a plurality of packet and has data size corresponding to data amount of one pack in MPEG-PS, and MPEG-TS is encoded for each defined data unit. Furthermore, time stamp information (ATS) added to a packet of MPEG-TS which is converted to MPEG-PS and time stamp information (SCR) added to a packet of the converted MPEG-PS are correlated with a predetermined formula.

Abstract: In a recording medium storing MPEG stream, flag information (encode_condition) indicating that the stream is recorded in a format enabling easily the first stream (MPEG transport stream) to be converted into the second stream (MPEG program stream) is provided. Such a flag information is included in Tip packet which is a control packet, in the medium. Thus it can easily determine whether the data is recorded in this format without analysis of data stored in the recording medium.

Abstract: A system stream creating apparatus including: a stream data transfer unit for extracting a piece of picture data having a size of a payload from the video stream data and storing it into a fixed-length pack; a header data generating unit for writing a system clock reference (SCR) in a pack header; a condition judging unit for judging, when the SCR is written, whether a difference between (1) a total number of pieces of picture data to be stored in the video decoder buffer up to the SCR and (2) a total number of pieces of picture data to be decoded by the decoding apparatus up to a unit time before the SCR has reached a predetermined value; and a-stop/resume control unit for, when the judgement is positive, causing the header data generating unit not to write the SCR and causing the stream data transfer unit to stop storing the piece of video stream data, and after having done these, causing a time updating unit to update the SCR then causing the condition judging unit to judge, and when the judgement is negat

Abstract: A video frame is input to a spectrum analyzer, which transforms the frame from a spatial domain into a frequency domain. A resolution determiner analyzes the output of the spectrum analyzer, thereby selecting a resolution appropriate for the video frame. Then, a resolution converter converts a resolution of the video frame into the resolution selected by the resolution determiner. Thereafter, the video frame is subjected to a coding process by block divider, DCT transformer, quantizer and variable-length coder so as to be output as a coded bit stream. By coding the input video frame at a resolution corresponding to the high-frequency component in the frame, a video of higher quality can be obtained with the bit rate reduced.

Abstract: A system stream creating apparatus including: a stream data transfer unit for extracting a piece of picture data having a size of a payload from the video stream data and storing it into a fixed-length pack; a header data generating unit for writing a system clock reference (SCR) in a pack header; a condition judging unit for judging, when the SCR is written, whether a difference between (1) a total number of pieces of picture data to be stored in the video decoder buffer up to the SCR and (2) a total number of pieces of picture data to be decoded by the decoding apparatus up to a unit time before the SCR has reached a predetermined value; and a stop/resume control unit for, when the judgement is positive, causing the header data generating unit not to write the SCR and causing the stream data transfer unit to stop storing the piece of video stream data, and after having done these, causing a time updating unit to update the SCR then causing the condition judging unit to judge, and when the judgement is negat

Abstract: A video frame is input to a spectrum analyzer, which transforms the frame from a spatial domain into a frequency domain. A resolution determiner analyzes the output of the spectrum analyzer, thereby selecting a resolution appropriate for the video frame. Then, a resolution converter converts a resolution of the video frame into the resolution selected by the resolution determiner. Thereafter, the video frame is subjected to a coding process by block divider, DCT transformer, quantizer and variable-length coder so as to be output as a coded bit stream. By coding the input video frame at a resolution corresponding to the high-frequency component in the frame, a video of higher quality can be obtained with the bit rate reduced.

Abstract: A cumulative error D is calculated by sequentially adding up errors, each representing a difference between a given average target number Ba and a number Bg of bits generated during every predetermined period of a coded bit stream. In determining a number Bt of bits allocated to a compression coder, a provisionally allocated bit number Bst is preset based on a coding complexity X such that a number of bits allocated to a scene with a high coding complexity exceeds the average target number Ba as for a frame just after the change of scenes. And if the cumulative error D exceeds a predetermined value, the provisionally allocated bit number Bst is corrected in accordance with the magnitude of the cumulative error D so as to be reducible to, but not less than, the average target number Ba. As for frames within the same scene on the other hand, a previously allocated bit number Bt is sequentially updated such that the cumulative error D does not exceed a predetermined maximum value Dmax.

Abstract: In recording AV digital stream to a recording medium, the apparatus creates a time map including an address on the medium of AV data that is related to a playback time of the AV data for each encoding data unit, when a playback time information (PTS: Presentation Time Stamp) of the AV digital stream can be identified. The apparatus creates a time map including an address on the medium of AV data that is related to a packet arrival time (ATS: Arrival Time Stamp) of the AV data, when the playback time information (PTS) of the AV digital stream can not be identified.

Abstract: A digital recording apparatus that obtains a digital stream including a plurality of frames, while recording the digital stream on a digital recording medium. This apparatus obtains, during recording, an instruction for a procedure in which a recording area is changed to another recording area which is not necessarily continuos with the recording area. When the instruction is obtained, the apparatus executes the procedure only when the number of frames which are recorded in the recording area is a predetermined number or more.

Abstract: A coding compression method for encoding the video image signal with a variable bit rate includes performing coding to the video image signal for each predetermined coding unit in accordance with a predetermined first coding parameter, which coding is completed within the coding unit, thereby generating a first coded stream, calculating a second coding parameter of the video image signal for each the predetermined coding unit while generating the first coded stream, indicating a partial section of the first coded stream, the partial section comprising the predetermined coding units, editing the second coding parameters corresponding to the designated subsections, performing coding to the video image signal of the designated subsections in accordance with the edited second coding parameters thereby to produce a second coded stream, and replacing a partial section of the first coded stream with at least a partial section of the second coded stream, the partial section of the second coded stream corresponding to

Abstract: A digital video recording apparatus reduces the audio output level before and during changes in an audio encoding condition (stereo, monaural, etc.). One embodiment of the digital video recording apparatus multiplexes video and audio signals to produce an output stream. A video recording control means controls the apparatus according to user input and design.