Apple Compressor 3 User Manual download pdf (Page 182)

DVD, VCD, and CD-ROM

MPEG-1 is the video compression format used for video CD (VCD) titles and is compatible

for use on DVD titles since all DVD players contain the hardware required for MPEG-1

playback. MPEG-1 is commonly used in videos distributed on CD-ROM. Its low bit rate

and small file sizes are useful when you must fit multiple hours of video onto a DVD and

do not require the broadcast quality of MPEG-2 encoding. A DVD can contain a mix of

MPEG-2 and MPEG-1 video.

On the Web

Since MPEG-1 was one of the first widely adopted compression standards, it has an

advantage of being compatible with most media players. This makes MPEG-1 attractive

for use on the web when you need maximum compatibility with relatively high quality.

Audio-Only

You can use MPEG-1 Layer 2 audio compression as an alternative to Dolby Digital

Professional or DTS compression. While there is no Apple setting for MPEG-1 audio-only

files in this release of Compressor, you can easily create a setting yourself. See Configuring

the MPEG-1 File Format for DVD Use for details.

MPEG-1 Specifications

Compressor supports all the MPEG-1 specifications for frame sizes, frame rates, video

encoding, and audio encoding.

MPEG-1 Frame Sizes and Frame Rates

Compressor can produce full frame rate video (25 fps and 29.97 fps for DVD and 23.976 fps,

25 fps, and 29.97 fps for the web) with SIF resolutions dependent on the use.

• Web: 320 x 240

• NTSC: 352 x 240

• PAL: 352 x 288

While the NTSC and PAL resolutions are roughly half the full resolution of MPEG-2 video,

when played on a DVD player they automatically expand to fill the entire screen.

MPEG-1 File Format Specifications

MPEG-1 video encoding uses a process very similar to that used in MPEG2

encoding—many of the same terms and settings apply. In Compressor, the encoding

settings are set as follows.

• Encoding mode: One pass

• GOP structure: Open

• GOP pattern: BBIBBP

182 Chapter 17 Creating MPEG-1 Output Files

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Apple Compressor 3 User Manual Page 182