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To record moving pictures, DVD-Video uses either H.262/MPEG-2 Part 2 compression at up to 9.8 Mbit/s (9,800 kbit/s) or MPEG-1 Part 2 compression at up to 1.856 Mbit/s (1,856 kbit/s). DVD-Video supports video with a bit depth of 8-bits per color YCbCr with 4:2:0 chroma subsampling.[7][8] The following formats are allowed for H.262/MPEG-2 Part 2 video[9][better source needed]: At 25 frames per second, interlaced (commonly used in regions with 50 Hz image scanning frequency): 720x576 pixels (same resolution as D-1) 704x576 pixels 352x576 pixels (same as the China Video Disc standard) 352x288 pixels At 29.97 frames per second, interlaced (commonly used in regions with 60 Hz image scanning frequency): 720x480 pixels (same resolution as D-1) 704x480 pixels 352x480 pixels (same as the China Video Disc standard) 352x240 pixels The following formats are allowed for MPEG-1 video: 352x288 pixels at 25 frame/s, progressive (Same as the VCD Standard) 352x240 pixels at 29.97 frame/s, progressive (Same as the VCD Standard) Video with 4:3 frame aspect ratio is supported in all video modes. Widescreen video is supported only in D-1 resolutions. The MPEG-1 Part 2 format does not support interlaced video. The H.262/MPEG-2 Part 2 format supports both interlaced and progressive-scan content. Content with frame rate different from one of the rates shown above can be encoded to H.262/MPEG-2 Part 2 by using pulldown. This is most commonly used to encode 23.976 frame/s content for playback at 29.97 frame/s. Pulldown can be implemented either directly or via flags that identify scanning type, field order and field repeating pattern. Such flags can be added in video stream by the H.262/MPEG-2 Part 2 encoder. A DVD player uses these flags to convert progressive content into interlaced video suitable for interlaced TV sets. These flags also help reproducing progressive content on progressive-scan television sets.[10][11] |
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