MAWG Relation MOV How to do the mapping Datatype XPath
Descriptive Properties (Core Set)
identifier N/A N/A
Content description
description exact in Mov files with 'classic' user data, the user-data item '©inf' (information about the movie) is probably closest. Find the '©inf' user-data item in the movie box (overall) or the track box if a specific track is identified. There may be multiple items, varying by language code. String (consult the format documentation for details) N/A
Technical Properties
frameSize exact The width and height fields from the track header box of that track. moov.trak/tkhd.(width | height) If requested for a movie, and there is only one video track, or if requested for a specific video track, the width and height of that track. N/A
compression exact The four-character codes from the sampe entry/ies in the track's sample description box (see ISO/IEC 14496-12). moov.track.mdia.minf.stbl.stsd.(sampleentry code) Follow the box hierarchy inside the movie box, into each track/mdia/stbl/stsd, and then extract the 4-character codes from the sample entry or entries. four character code(s) N/A
duration exact The duration field from the movie header (overall movie) or track header (for a track), divided by the timescale from the movie header. moov.mvhd.duration or moov.trak.tkhd.duration; divide by moov.mvhd.timescale Find the movie header box (mvhd) and get the timescale field, and then retreive the duration field from the movie or track header (mvhd, tkhd) as appropriate, and divide. float (after division), rational (as stored) N/A
format exact video/3gpp (valid for all resources), audio/3gpp (if it is known the movie has no visual presentation) static; but it may help to scan for the codecs used and supply those (RFC4281), the codecs parameter for bucket mime types) for 3GPP, MP4 and Movie files. MIME type N/A
samplingRate usually exact the field samplerate in the sample entry or entries for the movie tracks. This is a 16.16 integer with the fractional 16 bits, fractional bits may be non-zero. moov.trak.mdia.minf.stbl.stsd.(sampleentry.sampleRate) Find the samplerate 32-bit field in the sample entry, and right-shift 16 bits. Integer N/A
frameRate more general The sample count from the sample size (stsz) box in the sample table, divided by the duration (see above). moov.trak.mdia.minf.stbl.stsz.sampleCount, divided by duration. moov.mdia.stbl.stsz.samplecount / (moov.trak.tkhd.duration / moov.mvhd.timescale) Rational, float N/A
averageBitRate more specific or exact Either (a.i) sum the top-level box sizes or (a.ii) find the file size from external means (e.g. file system) or (b) for each track, compute the total sample size (from the sample size table). Then divide by duration (computed above). (a.i) sum over all top-level atoms(atom size) or (b) sum over all samples(moov.trak.mdia.mif.stbl.stsz( sampleSize ) (count also in the stsz box) N/A
numTracks exact count( moov.trak ), find types by mapping moov.trak.mdia.hdlr. Standard types are: ‘vide’ Video track, ‘soun’ Audio track, ‘hint’ Hint track, ‘meta’ Timed Metadata track, ‘auxv’ Auxiliary Video track, but other types may be registered at (count, type) tuples N/A