1MP4(3) MP4 File Format Library MP4(3)
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6 MP4Info - Return a textual summary of an mp4 file
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9 #include <mp4.h>
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11 char* MP4Info(
12 MP4FileHandle hFile,
13 MP4TrackId trackId = MP4_INVALID_TRACK_ID
14 );
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18 hFile
19 Specifies the mp4 file to which the operation applies.
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21 trackId
22 Specifies a track for which a summary is desired. If the value
23 is MP4_INVALID_TRACK_ID, the summary info is created for all
24 tracks in the mp4 file.
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28 Upon success, a malloc'ed string containing the summary info. Upon an
29 error, NULL.
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32 MP4Info provides a string that contains a textual summary of the con‐
33 tents of an mp4 file. This includes the track id's, the track type, and
34 track specific information. For example, for a video track, media
35 encoding, image size, frame rate, and bitrate are summarized.
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37 Note that the returned string is malloc'ed, so it is the caller's
38 responsibility to free() the string to prevent memory leaks. Also note
39 that the returned string contains newlines and tabs which may or may
40 not be desirable.
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42 The following is an example of the output of MP4Info():
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44 Track Type Info
45 1 video MPEG-4 Simple @ L3, 119.625 secs, 1008 kbps, 352x288 @
46 24.00 fps
47 2 audio MPEG-4, 119.327 secs, 128 kbps, 44100 Hz
48 3 hint Payload MP4V-ES for track 1
49 4 hint Payload mpeg4-generic for track 2
50 5 od Object Descriptors
51 6 scene BIFS
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55 MP4(3) MP4FileInfo(3)
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59Cisco Systems Inc. Version 0.9 MP4(3)