Grass Valley ProCoder 3 - Manual (Page 90)

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ProCoder 3
NTSC-PAL conversions between formats that have specific NTSC and PAL parameters
are handled by ProCoder automatically and do not use this setting.
Source Playback Speed Adjustment
ProCoder normally does not alter the playback rate of sources in order to preserve
the source’s original speed and visual intent. In other words, objects always move at
the same speed through video regardless of the target frame rate and a 10-second
source always converts to a 10-second target.
However, in some circumstances it is advantageous to slightly alter the source
playback rate by a very small amount in order to aid conversion. For example, a
29.97fps source can be sped up to 30fps playback for conversion to a 15fps output,
removing the possibility of interpolation artifacts and making the conversion faster.
It is also standard that 24fps film transfers to PAL DVD-Video are not put through
frame rate conversions. Instead, the 24fps film content is encoded and authored as if
it was 25fps content, resulting in a 4% speed-up. This eliminates any interpolation or
pulldown but makes PAL DVDs of film transfers ever-so-slightly shorter in length.
Enable Source Playback
Speed Adjustment Check this box to allow ProCoder to alter the playback speed of
sources up to the percentage in the Max. Adjustment (%) box.
Be careful not to set the Max. Adjustment percentage too high because it can cause
undesirable results,
such as distored audio and video playback.
Chapter Points
When a DVD is created with the multiple videos stitched together, the Chapter points
can automatically be set at the source stitch points.
Set Chapter Point at
Source Stitch Points Check this box to allow ProCoder to set Chapter Points at the
Source Stitch Points.
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