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749.
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This tag is used to record the name of an audio file related to the image data. The only relational information recorded here is the Exif audio file name and extension (an ASCII string consisting of 8 characters + '.' + 3 characters). The path is not recorded. Stipulations on audio and file naming conventions are defined in the specification. When using this tag, audio files must be recorded in conformance to the Exif audio format. Writers are also allowed to store the data such as Audio within APP2 as FlashPix extension stream data. Audio files must be recorded in conformance to the Exif audio format. The mapping of Exif image files and audio files is done in any of three ways, [1], [2] and [3]. If multiple files are mapped to one file as in [2] or [3], the above format is used to record just one audio file name. If there are multiple audio files, the first recorded file is given. In the case of [3], for example, for the Exif image file "DSC00001.JPG" only "SND00001.WAV" is given as the related Exif audio file. When there are three Exif audio files "SND00001.WAV", "SND00002.WAV" and "SND00003.WAV", the Exif image file name for each of them, "DSC00001.JPG", is indicated. By combining multiple relational information, a variety of playback possibilities can be supported. The method of using relational information is left to the implementation on the playback side. Since this information is an ASCII character string, it is terminated by NULL. When this tag is used to map audio files, the relation of the audio file to image data must also be indicated on the audio file end.
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