User Manual-Mac

138
Chapter 10, Using the Matrox MAX H.264 Codec
$ Target data rate (Variable/Constant data rate only) Enter the target
data rate, in
Mb/s or Kb/s, for your encoded video. The higher the target
data rate you specify, the better the video quality will be.
$ Minimum/Maximum data rate (Variable data rate only) If locked
( ) to the
Target data rate, the minimum and maximum data rates are
set automatically and cannot be changed. Unlock the minimum and
maximum data rates to set custom rates for your encoded video.
¦NoteIf you’ll be using Adobe Encore or Apple Compressor 3.5 to burn the
encoded H.264 file for Blu-ray, the maximum H.264 level and data rate
accepted by these applications for Blu-ray authoring is H.264 level 4.1 at
35 Mb/s (Encore) and H.264 level 4.1 at 30 Mb/s (Compressor).
$ Source video complexity (Variable data rate only) Specifies the
complexity level of your source video. A complex video can be defined as
containing scenes with many colors, sharp edges, or transitions. The
Matrox MAX H.264 codec uses this setting to determine how much
compression is required in order to deliver high-quality video at your
specified target data rate. The default setting (15) is suitable for most
moderately complex videos. For simpler or more complex videos, you
may need to adjust this setting to obtain the highest-quality encoding
possible while respecting your target data rate. If the size of your encoded
video is good but the quality can be improved, lower the complexity level
setting. Your video will then be encoded with less compression. If the
quality of your encoded video is good but the size is larger than expected,
raise the complexity level setting. Your video will then be encoded with
more compression. In any case, you may need to try different settings to
get your desired results.
$ Sample rate (Variable/Constant data rate only) Determines how
frequently the Matrox MAX H.264 codec verifies the current data rate
while encoding and compares it to your specified target data rate. If a
discrepancy exists between the current and target data rates, the current
data rate is adjusted as specified by the
Data rate adjustment option.
$ Data rate adjustment (Variable/Constant data rate only) When the
current encoding data rate does not match your specified target data rate,
this setting determines how quickly the current data rate is adjusted to
reach the target data rate. A gradual adjustment produces smoother
transitions than a quick adjustment.
$ Encoding quality (Constant quality only) Specifies the quality level for
your encoded video. Every frame in your video will be encoded at the
specified quality level with no regard to data rate.
9 For .mov files, select Enable audio under Audio to encode audio along with
your video, and then click
Settings to set your QuickTime movie audio
settings.