SD: (480p, 576p):
For SD Dolby intros, the most usually format is the MPEG-2 format a resolution of 720x480 pixels (NTSC) and 720x576 (PAL), using an average bit rate of about 5 Mbps (variable bitrate mode, which distributes the bits available according to the complexity of each frame). The maximum allowable rate is 9.8 Mbit/s, which is rarely used for practical reasons. The common container for SD trailers is vob. Most commercial DVD publishers often use maximum values of 7.8 to 8.5 Mbps, is possible to use a special mode called "16:9 anamorphic" that encoding a panoramic film using all the available resolution; in fact the vast majority of widescreen movies on DVD are encoded in this resolution, without recording the black bars as if it was part of the image. Just needed the black bar is added to fill the image to a 16:9 (if movies with an aspect ratio greater than 16: 9, such as 21: 9 format that usually abound in today's cinema).
HD ready (720p):
HD ready 720p is the short name for a HD video mode, mainly used in high-definition television (HD TV). The number 720 represents 720 horizontal display resolution lines, while the letter p means progressive scan. The common format for 720p intros is m2ts. The resolution for this HD format is 1280x720.
Full HD (1080p):
Full HD 1080p is an alternative name for the maximum HD resolution used in high-definition dolby and dts demos. The number 1080 represents 1080 horizontal lines for the vertical resolution, while the letter p means progressive scan and non-interlaced. The resolution for the intros and trailers in this HD format is 1920x1080 with m2ts container.
UHD 2K demos:
It is an emerging UHD standard for digital film resolutions and computer graphics. The name derives from the horizontal resolution, which is approximately 2,000 pixels. 2K represents the horizontal resolution because there are numerous aspect ratios used in films. The vertical depends on the aspect ratio with which the director decides to work. The resolution of UHD demos is 2,048 × 1.0803 (17: 9) and 2.2 megapixels.
UHD 4K trailers:
The UHD 4K name derives from the horizontal resolution, which is about 4,000 pixels. UHDV 4K (2160p) used in the digital television. There are different resolutions for the intros that qualify as UHD 4K:
4096 × 2160 (17:9)2 (8,8 megapíxeles) - Full UHD 4K
3840 x 2160 (16:9) (8,3 megapíxeles) (4K UHDV)