"meta.attr.1.stream.creation_time.markup"Comes from the metadata dictionary 
connected to the AVStream structure associated with each stream (audio, video, 
etc). May or may not be present for any given stream.

"meta.attr.creation_time.markup"
Comes from the metadata dictionary connected to the AVFormatContext structure 
associated with the file itself. May or may not be present for any given file.
The last time I checked, FFmpeg/Libav do not pass the gop_timecode value from 
each GOP header to any of the metadata dictionaries. But it has been a while 
since I looked.
~Brian
      From: Carl Karsten <c...@personnelware.com>
 To: mlt-devel <mlt-devel@lists.sourceforge.net> 
 Sent: Saturday, November 21, 2015 1:07 AM
 Subject: [Mlt-devel] Dynamictext recorded time
   
What is the #keyword# to show when the frame was recorded?

http://www.mltframework.org/bin/view/MLT/FilterDynamictext#argument
" Keywords may also be any frame property (e.g. meta.media.0.codec.frame_rate#)"

I am assuming that is tracked per frame and not just in the header.

exiftool 00009.MTS

this:

Time Code                       : 10:58:25:12
Date/Time Original              : 2015:11:15 11:02:28+00:00

not these

File Modification Date/Time     : 2015:11:15 05:33:38-06:00
File Access Date/Time           : 2015:11:21 00:57:27-06:00
File Inode Change Date/Time     : 2015:11:15 11:34:56-06:00


-- 
Carl K


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