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388 Appendix: MPEG Encoder Settings
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Quick, GOP-precise copying: This special Smart Rendering mode enables
MPEG material to be transferred without having to encode it for the target
medium, thereby greatly increasing the encoding speed. The video material
cannot appear to have been altered in any way; only hard cuts (without fades)
are permitted. These won't be executed precisely to the frame, but will rather
take place at the next GOP borders. For this reason, cuts should be set
somewhat more generously.
To burn DVDs in original 5.1 Surround Sound (Dolby Digital Audio) without
having to re-encode, this option has to be activated.
Allows you to rip the necessary settings from an existing MPEG file. This can
be useful if you want to merge MPEG files together without re-rendering via
Smart Rendering.
Video settings
Frame rate: PAL requires 25 frames/sec, NTSC 29.97 frames/sec. Please
note: encoding NTSC material as PAL or vice versa may be possible; however,
it will result in jittery images.
Aspect ratio: Lets you set the image side or pixel ratio. With MPEG 2 the
image format is displayed as image ratio; correspondingly there is 1:1 (square
screen, not recommended), 4:3 (regular video) an 2.21:1 (cinemascope). This
applies irrespectively of the selected video format.
With MPEG 1 the pixel format is specified instead. There is 1:1, CIR601
(corresponds to regular video) for 625 lines = PAL and 525 lines = NTSC and
the same in 16:9. When selecting the output format Video CD the pixel format
is automatically adjusted to the selected video format. Use with caution, even if
you only want to export MPEG 1.
The option Auto is set as default. Here you can adjust the Movie settings (view
page 311) accordingly.
Re
solution: Width and height of the video corresponds with the settings in the
export dialog.
GOP structure: Here you can change the settings of the GOP (view page 394)
sequence, i.e.
the number of P frames per I frame within a GOP. Please note
that the total length of the GOP must not exceed 15 frames, which
corresponds to the default setting (1 I frame + 4 P frames + 5*2 B frames = 15
frames).