MATLAB Function Reference |
Return information about multimedia file
Syntax
Description
info = mmfileinfo(filename)
returns a structure, info
, whose fields contain information about the contents of the multimedia file identified by the string filename
.
If filename
is a URL, mmfileinfo
might take a long time to return because it must first download the file. For large files, downloading can take several minutes. To avoid blocking the MATLAB command line while this processing takes place, download the file before calling mmfileinfo
.
The info
structure contains the following fields, listed in the order they appear in the structure.
Field |
Description |
Filename |
String indicating the name of the file |
Duration |
Length of the file in seconds |
Audio |
Structure containing information about the audio data in the file. See Audio Data for more information about this data structure. |
Video |
Structure containing information about the video data in the file. See Video Data for more information about this data structure. |
Audio Data
The Audio
structure contains the following fields, listed in the order they appear in the structure. If the file does not contain audio data, the fields in the structure are empty.
Field |
Description |
Format |
Text string, indicating the audio format |
NumberOfChannels |
Number of audio channels |
Video Data
The Video
structure contains the following fields, listed in the order they appear in the structure.
Field |
Description |
Format |
Text string, indicating the video format |
Height |
Height of the video frame |
Width |
Width of the video frame |
Examples
This example gets information about the contents of a file containing audio data.
info = mmfileinfo('my_audio_data.mp3') info = Filename: 'my_audio_data.mp3' Duration: 1.6030e+002 Audio: [1x1 struct] Video: [1x1 struct]
To look at the information returned about the audio data in the file, examine the fields in the Audio
structure.
Because the file contains only audio data, the fields in the Video
structure are empty.
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