User guide

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Chapter 10, Using the Matrox MAX H.264 Codec
¦NoteWhen creating an H.264 elementary stream file for Blu-ray, the GOP
size must be less than one second of video. For example, if the frame rate that
you want for your encoded video is 29.97 fps, the GOP size must be 29 frames
or less.
$ Distance between P frames Select the number of frames between P
frames that you want for your GOP structure. This setting can be changed
for a simple GOP structure only.
6 Under Hardware Preprocessing, specify the hardware-related processing
settings for your encoded video:
$ Hardware scaling If your source video must be scaled for encoding,
select this option if you want the scaling to be done by the MXO2
hardware. This produces the best-quality results and frees your system’s
resources for other tasks. Clear this option to leverage your system’s
resources with the MXO2 hardware for even faster encoding times. If
enabled, specify the following scaling options:
• De-interlace video Select this option if your source video is
interlaced and you want to de-interlace your video before encoding.
This option can be used to display your encoded video on a monitor
that displays lines progressively, such as an LCD or computer monitor.
For all other instances, make sure this option is not selected.
• Retain aspect ratio when scaling If your source video must be
scaled for encoding, and its aspect ratio does not match your selected
compression aspect ratio, select this option to maintain your source
video’s aspect ratio. If this option is selected, MXO2 will encode your
source video as pillarbox video when encoding to a larger aspect ratio,
or letterbox video when encoding to a smaller aspect ratio. If this
option is not selected, MXO2 will encode your source video as
anamorphic video.
¡ Importan t When your source video must be scaled for encoding and
Hardware scaling is disabled, if you’re working with Compressor v3.5 or
later you can select
Preserve source aspect ratio from the Padding list in
Compressor’s Geometry pane to maintain your source video’s aspect ratio.
$ Noise Filter Sets the level of noise filtering that you want to apply to
your video before encoding. Increasing the noise filter level reduces the
amount of high frequencies in your source video by softening the
high-detail portions of your video. Since high frequencies require more
bits to encode, increasing the noise filter level leaves more bits available
for the encoding of other frames, which can improve the overall quality of
your encoded video. However, if you lose too much detail in your encoded
video you may need to decrease the noise filter level.
$ Scene detection (.mov files only) Enabling this option allows the
Matrox MAX H.264 codec to detect scene changes while encoding, and