On Oct 20, 2005, at 12:09 PM, Juan P. Pertierra wrote:
Our application receives RGB images from an external interface. The
images are actually video frames and they come in at 30fps. We need
to write an engine that allows users to export Quicktime clips of
this 30fps video using the codecs that are installed in the system.
A while back ago I looked into this and it seemed like it could be
done with either QTKit or the Quicktime API, but I received mixed
responses about whether the QTKit was mature enough to support
doing this without having to use the Quicktime API anyway. Is this
still the case?
QTKit should be able to handle this task quite easily. My guess is
that you would first want to assemble all the images into a QTMovie
(using -[QTMovie addImage:forDuration:withAttributes:]) and then
export the QTMovie using the desired codec settings (using -[QTMovie
writeToFile:withAttributes:]).
It's not clear to me whether the codec settings are known in advance
(and perhaps never change from session to session) or are dynamically
selected by the user. If the latter, then you probably would need to
dip down into raw QuickTime to create the atom container that is
passed as the QTMovieExportSettings.
Having to use the QuickTime API for some tasks should not IMHO
dissuade you from using QTKit for most other operations.
Tim Monroe
QuickTime Engineering
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