Abstract: A video/audio data output device includes a demultiplexing section, a video decoder that generates video data by decoding the video stream signal, an audio decoder that generates audio data by decoding the audio stream signal, a video output section that outputs the video data in synchronism with the system clock, an audio output section that outputs the audio data in synchronism with the system clock, a video adjusting section, and an audio output adjusting section. The demultiplexing section demultiplexes a video stream signal, an audio stream signal, and a system clock from an input signal, the video adjusting section processes a video frame that has been output from the video output section, and the audio output adjusting section delays the system clock to be supplied to the audio output section, in accordance with a length of time that the video adjusting section takes to process the video frame.

Abstract: This is a computer-readable portable storage medium which is used by a computer managing a plurality of frame buffers and which stores a program enabling the computer to execute a process, and the process comprises preparing an area in which data of a valid chain indicating a connection among frame buffers storing valid image data of the plurality of frame buffers and data of a vacant chain indicating a connection among frame buffers storing no valid image data, is stored, on memory and generating/updating data of the valid chain and the vacant chain when valid image data is stored in one of the plurality of frame buffers and storing it in the memory.

Abstract: An original picture inserted for each frame is divided into motion compensation blocks and each of the motion compensation blocks is encoded using motion compensation inter-frame prediction. A fade scene is detected using at least one of a sum of differential absolute values calculated when detecting a motion vector, a total number of motion compensation blocks and a total number of intra-motion compensation blocks being motion compensation blocks encoded as still pictures in addition to a motion vector detected from each of the motion compensation blocks. The encoding of the original picture is controlled, according to the detection result.

Abstract: A video/audio data output device includes a demultiplexing section, a video decoder that generates video data by decoding the video stream signal, an audio decoder that generates audio data by decoding the audio stream signal, a video output section that outputs the video data in synchronism with the system clock, an audio output section that outputs the audio data in synchronism with the system clock, a video adjusting section, and an audio output adjusting section. The demultiplexing section demultiplexes a video stream signal, an audio stream signal, and a system clock from an input signal, the video adjusting section processes a video frame that has been output from the video output section, and the audio output adjusting section delays the system clock to be supplied to the audio output section, in accordance with a length of time that the video adjusting section takes to process the video frame.

Abstract: In encoding of moving pictures, I-frame is inserted when a scene change occurs. If scene changes frequently occur in the range of a predetermined amount-of-information allocation, the amount of information allocated to an encoding process on I-frame becomes enlarged. Therefore, the amount of information cannot be sufficiently reserved for another coding, thereby considerably degrading the quality of an image. Thus, a scene change detection threshold is obtained depending on the remainder in the VBV buffer, the scene change detection threshold is compared with a scene change detection value for determination of the occurrence of a scene change, and it is determined whether or not a scene change has occurred based on the comparison result.

Abstract: A moving picture coding program directs a computer to perform the procedure of detecting a scene change between images depending on, for example, whether or not summation of absolute values of inter-frame differences has exceeded a threshold, and the procedure of coding image data before a scene change by rough quantization when the scene change is detected.

Abstract: An original picture inserted for each frame is divided into motion compensation blocks and each of the motion compensation blocks is encoded using motion compensation inter-frame prediction. A fade scene is detected using at least one of a sum of differential absolute values calculated when detecting a motion vector, a total number of motion compensation blocks and a total number of intra-motion compensation blocks being motion compensation blocks encoded as still pictures in addition to a motion vector detected from each of the motion compensation blocks. The encoding of the original picture is controlled, according to the detection result.

Abstract: In encoding of moving pictures, I-frame is inserted when a scene change occurs. If scene changes frequently occur in the range of a predetermined amount-of-information allocation, the amount of information allocated to an encoding process on I-frame becomes enlarged. Therefore, the amount of information cannot be sufficiently reserved for another coding, thereby considerably degrading the quality of an image. Thus, a scene change detection threshold is obtained depending on the remainder in the VBV buffer, the scene change detection threshold is compared with a scene change detection value for determination of the occurrence of a scene change, and it is determined whether or not a scene change has occurred based on the comparison result.

Abstract: This is a computer-readable portable storage medium which is used by a computer managing a plurality of frame buffers and which stores a program enabling the computer to execute a process, and the process comprises preparing an area in which data of a valid chain indicating a connection among frame buffers storing valid image data of the plurality of frame buffers and data of a vacant chain indicating a connection among frame buffers storing no valid image data, is stored, on memory and generating/updating data of the valid chain and the vacant chain when valid image data is stored in one of the plurality of frame buffers and storing it in the memory.

Abstract: A moving picture coding program directs a computer to perform the procedure of detecting a scene change between images depending on, for example, whether or not summation of absolute values of inter-frame differences has exceeded a threshold, and the procedure of coding image data before a scene change by rough quantization when the scene change is detected.