Apple Compressor (4.0) Bedienungsanleitung PDF herunterladen (Seite 17)

Importing overview

The rst step in the traditional Compressor transcoding process is to import at least one source

media le into the Batch window, thus creating a batch.

If you’re using the batch template workow, the rst step is to choose a batch template. For more

information, see Quick and easy batch template workow on page 14.

Here are some tips for importing source media:

•

About highly compressed source les: It’s strongly recommended that you do not use highly

compressed les, such as MPEG les, as your source les, because they can cause artifacts in

the encoded video.

•

When importing QuickTime reference movies: If you submit a reference movie for distributed

processing, the Apple Qmaster distributed processing system automatically copies the

appropriate media les to the processing cluster. For the best performance, you can avoid

this le transfer step by making sure that the media les specied in the reference movie are

available to each node of the Apple Qmaster cluster. For more information, see How the Apple

Qmaster system distributes batches on page 221.

•

When importing MPEG-2 les: When you import an MPEG-2 le, Compressor must parse the

le before you can play it in the Preview window. Parsing the le involves determining its

frame structure and other necessary information about the le. Because the frame structure

can change throughout the le, Compressor must scan the entire le, which can take several

minutes for longer les.

This doesn’t happen with MPEG-2 elementary les encoded using Compressor that had the

“Add DVD Studio Pro metadata” checkbox selected. For more information, see MPEG-2 Encoder

pane on page 89.

•

When importing Dolby Digital Professional source media: You can use Dolby Digital Professional

AC-3 audio les as source media les for your jobs. There are two common reasons to do this:

•

To test a le you just encoded: Because you cannot preview the Dolby Digital Professional output

settings, importing an encoded le into a job allows you to play it and verify the settings.

•

To convert a Dolby Digital audio le to another format: Because not all media players include

Dolby Digital decoders, you may nd that you need to transcode the le to another format.

Import source media

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Apple Compressor (4.0) Bedienungsanleitung Seite 17