4.1

Chapter 4 Advanced adjustments 26
Retiming
This section contains one property:
•
Set duration to: Sets the processing algorithm used to adjust the frame rate during transcoding.
Select either of the following options:
•
[Percentage] of source: Modies the output clip’s speed by a percentage of the source clip’s
speed. Enter a value in the percentage eld or choose a preset value from the adjacent
pop-up menu (with a downward arrow).
•
[Total duration]: Sets the duration of the clip. Enter a timecode duration in the eld or click
the arrows to increase or decrease the time.
For more information, see Retime video and audio output on page 71.
Audio properties
•
Channel layout: Use the pop-up menu to manually set the type of audio channel layout. For
more information about audio channel layouts, including the surround sound channel layout,
see About audio channels on page 67.
•
Sample rate: Use this pop-up menu to set the number of times per second that music
waveforms (samples) are captured digitally. The higher the sample rate, the higher the audio
quality and the larger the le size.
Note: All les intended for video and audio DVD authoring must have a 48 kHz sample rate as
required by the DVD specication.
•
Target system: Use this pop-up menu to identify the system on which you are going to play the
output le. Compressor limits options in other related properties to those appropriate for the
target system.
•
DVD Video: Choose this option if you’re encoding for use in a DVD video authoring application.
•
DVD Audio: Choose this option if you’re encoding for use in a DVD audio authoring application.
•
Generic AC-3: Choose this option to remove the target system setting limit (the most
generic choice).
•
Data rate: Use this pop-up menu to set the number of kilobits per second (kbps) required to
deliver your audio le. Using a higher rate will produce a higher-quality audio le.
Tip: For stereo encoding, rates of 192 kbps and 224 kbps are typical and will produce good
results. For Dolby Digital 5.1 encoding, a rate of 384 kbps is recommended. For 5.1 Dolby Digital
Plus encoding, a rate of 192 kbps is recommended.
•
Bit stream mode: Use this pop-up menu to dene the audio service contained within the Dolby
Digital or Dolby Digital Plus bitstream.
•
Surround mode: When using a Mono or Stereo (L R) channel layout, this property tells the
playback device whether the two-channel encoded bitstream contains a Dolby Surround (Lt/
Rt) program that requires Dolby Pro Logic decoding. There are three menu options:
•
Not Indicated: Does not send the playback device information about whether the bitstream
was encoded in Dolby Surround.
•
Not Encoded: Tells the playback device that the bitstream contains information not encoded
in Dolby Surround.
•
Surround Encoded: Tells the playback device that the bitstream contains information encoded
in Dolby Surround.
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