Hi Willem, On Wednesday, 12 September 2018 20:39:21 CEST Willem Ferguson wrote:
> When looking for the date/time of a video file, which EXIF attribute is > used to get the time? Is it a UCT value? To my knowledge Quicktime (mp4, mov, etc.) doesn't have EXIF in that sense. It consists of "atoms" (which amazingly can contain other atoms - no kidding) and we search for the "mdhd" (=media header) atom, from which we extract the timestamp and the duration. The timestamp is supposed to be in UTC (as seconds since 1.1.1904 - Apple time). You *can* incorporate XMP data (https://de.wikipedia.org/wiki/ Extensible_Metadata_Platform) into such a file. If there is interest, I can have a look at how much work it would be to extract useful information from that. Since Qt has an, albeit dog-slow, XML parser it shouldn't be too hard. For WMV files we use the "file properties object" in a similar way. Not sure if these details answer your question...? > I am messing with exiftool to alter some videos to have date/times that > coincide with a dive in order to see the way the video is shown on the > profile. Which option do you use to modify the date? I'll try to see what it does. Berthold _______________________________________________ subsurface mailing list subsurface@subsurface-divelog.org http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface