exif</code>, and information about the audio content is stored in the <code>fmt </code>
chunk.  As well as this information, some video information and proprietary
manufacturer-specific information is also extracted.</p>

<p>Large AVI videos may be a concatenation of two or more RIFF chunks.  For
these files, information is extracted from subsequent RIFF chunks as
sub-documents, but the Duration is calculated for the full video.</p>
<blockquote>
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