Philips 14AA3322/40B Guía de instalación Pagina 19

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Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal
19 | P a g e
Image 9.1.3.4.1: MPEG PES & TS structure (from the presentation of Walter Fischer in Belgium 2008).
9.1.3.5 The “.mpg” format:
The “.mpg” or “.mpeg” (Moving Pictures Expert Group) format is the most widely known and
used video storing file. It includes six subcategories. The MPEG-1 and MPEG-2 which are low
compressed video formats, the MPEG-3, MPEG-4 and MPEG-7 which are high compressed
video formats and the MPEG-21 which is a multipurpose standard. All the subcategories are
evolutions and updates from the first one.
The MPEG-1 provides a video resolution of 352x240 pixels at 30 frames per second (fps). This
video quality is slightly lower than the VCR videos.
The MPEG-2 offers resolutions of 720x480 and 1280x720 pixels at 60 fps combined with full CD
quality audio. This is sufficient for all the major TV standards and even for HDTV. Encoding a
video in MPEG-2 format requires significantly more processing power than decompressing a
MPEG-2 data stream.
The MPEG-3 was designed for HDTV but it was abandoned because MPEG-2 was fully covering
the demands.
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