What are these tags?

[11august]

Hello!

Extracting iPhone 8 video metadata with the -ee option return me two tags that I haven't found anywhere in the ExifTool tag names documentation: "AudioTrackDuration" and "AudioMediaDuration" with the same data (the video duration in seconds).

Is anybody knows what it's all about? Also, why in some video it says 0, 1 or 2 instead of the duration in seconds?

Also, I have another question about the tag "AudioChannelType" which is a xmpDM tag. In the same videos, their values are "Mono", which is right but why in some other videos (also taken with an iPhone they are tagged as "1" or "2". I know that 1 stands for mono and 2 for stereo, but shouldn't this tag be written obligatorily either in "5.1", "7.1", "16 Channel", "Mono", "Stereo" or "Other" like it's specified in the XMP ExifTool doc ?

Thanks!

[Phil Harvey]

Where are these tags stored?  Use -G1 when extracting to determine this.

I can't find AudioChannelType in the ExifTool XMP documentation.

- Phil

[StarGeek]

It's under the XMP-xmpDM section.

But according to that entry, it looks like it just holds the literal string.  There's no printConv to change 1 or 2 to anything else.

[Phil Harvey]

Ah, thanks.  I was grep-ing the code for "AudioChannelType", but the ID is "audioChannelType".

- Phil