User guide

226
Chapter 9, Using Matrox MediaExport
specify a quantization scale value, select Constant quantization scale,
then either select a preset value from the list, or enter a value between 0 and
31. For best results, select a constant quantization value between 2 and 6.
5 If you’ve selected Constant quantization scale, you can also select
Specify average bit rate range, then enter an average minimum bit rate to
use while encoding slow video, and an average maximum bit rate to use
while encoding fast video.
¦NoteThe average maximum value you enter must be less than or equal to
14648 Kbps, and less than or equal to the
Maximum bit rate value.
6 Click OK to return to the session window.
Ligos-compliant profile settings
As explained in “Selecting your Ligos MPEG common settings” on page 222, if
you customize your MPEG settings, you must select profile settings that are
compliant with the MPEG stream you’re using. Non-compliant settings may
produce undesirable results in your exported video, and in some cases cause your
export to be unsuccessful or unsupported by your DVD authoring program. The
required settings are listed in the following tables.
MPEG Stream DVD - MPEG-2
File Generation Video in M1V/M2V, audio in WAV
Profile and Level Main Profile @ Main Level
Audio Sampling 48000/16-bit
Frame Size 720 × 480 (NTSC), 720 × 576 (PAL)
Frame Rate 29.97 frames per second (NTSC), 25 frames per second (PAL)
Aspect Ratio 4:3 or 16:9
GOP Length 15
Subgroup Length 3
Put sequence header(s) before every GOP
Audio (bit rate) Compress at no higher than 384 Kbps
Video (bit rate) no higher than 8000 Kbps