[Mp4-tech] question about track header

[Swapna Matwankar]

Hello all,
I have a question about track header in MP4 file.
In the document, 'Information technology -- Coding of audio-visual objects -- Part 12: ISO base media file format', following information is given about width and height field in the tkhd box:
width and height specify the track's visual presentation size as fixed-point 16.16 values. These need not be the same as the pixel dimensions of the images, which is documented in the sample description(s); all images in the sequence are scaled to this size, before any overall transformation of the track represented by the matrix. The pixel dimensions of the images are the default values.
Is it mandatory to scale the image to the height and width specified in the tkhd atom? What if the LCD is smaller than these dimensions?
Thanks in advance.
regards,
swapna
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