User guide

Using Matrox M.Key/100 with VFW programs

$ 720×486 or 720 × 576 if you are rendering to NTSC, 486p, or 576p format

using the Uncompressed SD or M-JPEG codec.

$ 1920×1080 or 1280×720 if you are rendering to 1080i/p or 720p format

using the Uncompressed HD or DVCPRO HD codec.

$ 1440×1080, 1920×1080, or 1280×720 if you are rendering to

1440×1080i/p, 1080i/p, or 720p format using the MPEG-2 I-frame HD

codec.

$ 480×270 or 320×180 if you are rendering to offline HD format. If you’re

rendering clips for use in an Adobe Premiere Pro project on Matrox Axio,

set the frame size to 480×270 for a 1440×1080i/p or 1080i/p project, or

320×180 for a 720p project. For more information, see “Using the Matrox

Offline HD Codec” in your Matrox Axio Installation and User Guide.

• 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),

scanning mode (interlaced or progressive), or bit depth (8-bit or 10-bit), such

as to export uncompressed 1080i @ 25 fps clips to uncompressed 1080p

@ 25 fps format, 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.

¦NoteBefore 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 or Field 1, try switching the setting to Even field or Field 2.

Selecting color space conversion options

When you render material to an .avi file using a Matrox VFW codec, you can

determine how you want the luminance levels and chroma information to be

processed during the color space conversion that’s performed during the render.

¦NoteThe default settings for color space conversion provide good results for

most applications. We recommend that you change these settings only when

needed for special purposes.