Frame Size and Frame Rate
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 compression at up to 1.856 Mbit/s (1,856 kbit/s).
The following formats are allowed for H.262/MPEG-2 Part 2 video:
- At 25 frames per second, interlaced (commonly used in regions with 50 Hz image scanning frequency):
- 720 × 576 pixels (same resolution as D-1)
- 704 × 576 pixels
- 352 × 576 pixels (same as the China Video Disc standard)
- 352 x 288 pixels
- At 29.97 frames per second, interlaced (commonly used in regions with 60 Hz image scanning frequency):
- 720 × 480 pixels (same resolution as D-1)
- 704 × 480 pixels
- 352 × 480 pixels (same as the China Video Disc standard)
- 352 x 240 pixels
The following formats are allowed for MPEG-1 video:
- 352 × 288 pixels at 25 frame/s, progressive (Same as the VCD Standard)
- 352 × 240 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 full D1 resolutions.
MPEG-1 formats do not support interlaced video. H.262/MPEG-2 Part 2 formats support both interlaced and progressive-scan content. Content with frame rate different from one of the rates shown above can be encoded by using pulldown. 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 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.
Read more about this topic: DVD-Video
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