Apple Compressor 3 Manual do Utilizador Página 226

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Packet Maximum Duration field: Enter a number to specify the longest duration allowable
(in milliseconds) for a streaming packet in your output media file. The duration affects
MPEG-4 Part 2 audio only. It limits the maximum amount of audio (in milliseconds) in
any packet, which limits the audio dropout created by the loss of a packet.
Using Default MPEG-4 Part 2 Settings
If you don’t need to customize the video and audio settings of your MPEG-4 Part 2 file,
you can use the “quick-and-easy” method to transcode your source media files. This
consists of accepting the default MPEG-4 Part 2 output format settings.
Default Video Pane Settings
These are the default video settings for MPEG-4 Part 2 output media files.
Video Enabled checkbox: Selected
ISMA Profile: Basic
Frame Rate: 15 fps
Key frame interval: 15 frames
Bit Rate: 368 kbps
See Video Pane for more information.
Default Audio Pane Settings
These are the default audio settings for MPEG-4 Part 2 output media files.
Audio Enabled checkbox: Selected
Channels: Stereo
Sample Rate: 44.1 kHz
Quality: High
226 Chapter 19 Creating MPEG-4 Output Files
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