Matrox MXO2 Installation And User Manual page 264

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If you've attached a closed caption data file to your sequence and you'd like
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the closed captioning to be embedded in your exported Matrox .mp4 file,
under Video , select Embed closed captioning in file :
Remarks
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From the Source Range list in the Source panel, select the range you want
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to export, such as Work Area .
Click Export to immediately start your export.
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Chapter 17, Using the Matrox MAX H.264 Codec with Adobe Software
Your sequence can have either an attached .mcc or .scc data file. However,
if you've attached an .mcc file to your sequence, it must contain CEA-608
data in order for the closed captions to be embedded in your exported
Matrox .mp4 file.
Embedding of closed captioning is supported only when exporting a
sequence that has a frame rate of 29.97 fps to an export format that also
has a frame rate of 29.97 fps.
The closed captioning in your Matrox .mp4 file can be displayed when
you play back the file using supported applications and mobile devices
that are capable of playing back .mp4 files with closed captioning. If you
don't see the closed captioning when you play back your Matrox .mp4
file, try changing the file's extension to .m4v.