QuickTime 3 Reference
As discussed in Chapter 3, "Image Compression Manager," timecode support was added to the Image Compression Manager in QuickTime 2.0. QuickTime 2.0 and above has continued to be enhanced to provide timecode information to decompressor components when movies are played. This feature is provided for hardware systems that may want to use timecode information.
To support timecode in your image compressor component, your codec must support the CDCodecSetTimeCode function ImageCodecSetTimeCode , which allows the Image Compression Manager to set the timecode value for the next frame to be decompressed. For more information about timecode tracks and the timecode media handler, see Chapter 1, "Movie Toolbox."