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A rejoint le : 3 juin 2022

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Video and audio bit rates are generally given either for the camera original recording, or after any editing it has undergone. Both analog and digital video formats exist. For analog, the V and H level signals are recorded on the video tape, while for digital, the PCM sample data is stored on the hard disk of the recording device.For most digital video formats, audio is also stored on the disk, either uncompressed or compressed. One such well known format is the MPEG-1 compressed video standard, which is used for DVD video. MPEG-1 is the video standard specified by the Moving Picture Experts Group (MPEG). It is typically used to encode video frames into a compressed form that allows the frames to be stored in digital form on a digital video disk (DVD) instead of requiring them to be stored on tape. MPEG-1 compressed video is very efficient compared to conventional analog video, and can be compressed to very small file sizes (typically 10-15 megabytes) for DVD video. MPEG-1 compression was designed to compress video, however it can also be used to compress audio.One of the features of digital video is that it lends itself to being split into several individual streams, each of which will transmit independently of the others. For example, a digital video recording can contain several long sequences of video frames, which are each independently compressed into a compressed data file. This is the case with most video editing programs. Such streams of compressed data are independent of each other, and generally the length of the streams is not constant.In the case of the MPEG-1 standard this means that each encoded video frame is split into several inter-dependent blocks, or macroblocks, each of which is compressed independently.In order for digital audio to be transmitted over the same network as video, it must be compressed as well. This is commonly done using the MPEG-1 standard for audio data also, in the same way that video data is compressed. However, each audio bit is given a one-to-one relationship with a certain number of video bit, so that any audio bit that is compressed in MPEG-1 will be recorded in the same time as the corresponding video bit. For example, a compressed audio bit may take up one video bit, or one quarter of a video bit, or one eighth, or any other integer multiple.Now, if a DVD is encoded using the MPEG-1 standard for video compression, and the video stream is encoded using the MPEG-1 standard for audio compression, then when 08929e5ed8

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