Before you start rendering – Matrox Electronic Systems Matrox RT.X2 User Manual

Page 161

153

Before you start rendering

Note

You must have the Matrox RT.X2 hardware for full support of the Matrox

MPEG-2 I-frame HD codec. The “+ Alpha” Matrox MPEG-2 I-frame codecs are
available only on a system that has RT.X2 hardware.

Before you start rendering

Before you start rendering material to a Matrox .avi file, make the following
settings in your VFW program:

• Set the appropriate frame rate for the video format to which you are

rendering. For example, if you are rendering to PAL format, set the frame
rate to 25 fps.

• Set the frame size of your rendered material to full-screen:

720 × 480 if you are rendering to NTSC or 486p format using the
DV/DVCAM, DVCPRO, or MPEG-2 I-frame codec.

720 × 576 if you are rendering to PAL or 576p format using the
DV/DVCAM, DVCPRO, or MPEG-2 I-frame codec.

1440×1080 or 1280× 720 if you are rendering to 1440×1080i/p or 720p
format using the MPEG-2 I-frame HD codec.

• To render video using the same compression format, frame size, and frame

rate as your source video but using a different video quality (data rate) or
scanning mode (interlaced or progressive), you must select the

Recompress

Always

option so that your video will be recompressed during the export.

• If you’ll be rendering audio, set the audio sample rate to 48 kHz and the

sample size to 16-bit (mono or stereo).

• For best results, make sure you clear your program’s

Data rate limit

option

for rendered material. This ensures that your .avi files will be rendered at the
particular video quality you select.

• If you’re using Adobe Premiere Pro, set the

Fields

for rendering to

Lower

Field First

for NTSC video,

Upper Field First

for PAL and interlaced HD

video, or

No Fields (Progressive Scan)

for progressive video.

Note

Before rendering a lot of material, check that your rendered animations

and transitions such as wipes and slides play back smoothly. If they appear
jumpy, try adjusting the field dominance or field order for your rendered material.
For example, if your transitions appear jumpy with the field dominance set to

Odd field

Field 1

, try switching the setting to

Even field

Field 2