Apple Compressor (4.0) Bedienungsanleitung PDF herunterladen (Seite 47)

Chapter 4 Assign settings and preview media 47

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Compression markers: Compression markers are also known as manual compression markers.

These are markers you can add in the Compressor Preview window to indicate when

Compressor should generate an MPEG I-frame during compression. For more information

about I-frames, see About GOPs (groups of pictures) on page 99.

These markers appear as blue in the Preview window timeline.

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Edit/cut markers: Edit/cut markers are also known as automatic compression markers. These

markers are intended to be at each cut or transition point in a sequence. During transcoding,

Compressor uses edit/cut markers to generate MPEG I-frames at these points, improving

compression quality.

These markers appear as green in the Preview window timeline.

Markers are supported in the following output le formats:

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MPEG-2

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MPEG-4 when congured for podcasting (audio-only with the Enhanced Podcast checkbox

selected)

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QuickTime Movie

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H.264 for Apple Devices

Important: You can set and congure markers for other output le formats, but they are not

included in the encoded output le.

Manually add and remove markers

The Preview window includes comprehensive marker support, including the ability to manage

markers already added to the source media le, manually add or remove markers, and import

chapter marker lists. When you add a marker to a clip, it appears as a chapter marker by default.

You can then change the marker to a compression or podcast marker if you wish (see Add

compression or podcast markers on page 49).

Add a chapter marker to your clip

1 In the Preview window, choose Show Chapter/Podcast Markers from the Marker pop-up menu,

so that there’s a checkmark by it.

2 Choose a clip from the Batch Item pop-up menu or click the Batch Item selection button until

the clip you want appears in the pop-up menu.

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Apple Compressor (4.0) Bedienungsanleitung Seite 47