Alcorn Mcbride Digital Video Machine HD, User Manual

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Making Videos 29
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The MPEG-2 Program Stream
The Information Station plays MPEG-2 Program Streams. This stream is a
Variable or Constant bitrate stream containing both audio and video. In order to
achieve playback of video only, you must encode an elementary stream of silent
audio that will be combined with your elementary video stream to create a
program stream. A program stream is not the same as a DVD VOB file. The
Information Station does not play VOB files.
What is a Variable Bitrate?
Unlike MPEG-1, which uses a constant bitrate, MPEG-2 also supports variable
bitrate program streams. This means that the encoding process scales the bitrate
up and down depending on quality needs. A scene with a tremendous amount of
movement requires more bits than a still scene.
Program Stream:
Mux Bit Rate: 15.0 Mbits/s max
The stream should be authored according to ISO 13818-1 Format
MPEG-2 Video:
Picture Format SIF-NTSC: 240 lines by 352
pixels
SIF-PAL: 288 lines by 352 pixels
HalfD1-NTSC: 480 lines by 352
pixels
HalfD1-PAL: 576 lines by 352
pixels
CCIR-NTSC: 480 lines by 704(or
720) pixels
CCIR-PAL: 576 lines by 704(or
720) pixels
Chroma Format 4:2:0
MPEG-1 Audio (Layer II):
Sample Rate: 44.1 KHz or 48KHz
Emphasis: Off
Mode: Stereo