[digiKam-users] MTS video metadata

[Maik Qualmann]

I found a sample video from this camera on the web. In fact, FFmpeg does not 
find the date in the file. Exiftool displays a date. All other parameters such 
as video codec, audio codec, etc. are recognized.

Maik

Am Samstag, 6. Oktober 2018, 17:10:40 CEST schrieb Gilles Caulier:
> Hi,
> 
> I would add more technical precision here about video files support :
> 
> 1/ 5.x and older release do not have video metadata support. Exiv2video
> support is full of bug and we disable it at all.
> 2/ 6.0.0 has video metadata support. It use ffmpeg for that. We write a
> wrapper to import all metadata read by ffmpeg when video is identified.
> 3/ ffmpeg parse video file in different way than exiv2 or exiftool. To be
> honest, i don't know well where the data are extracted. video metadata are
> more complex than photo metadata. this is not a puzzle, it's a huge maze.
> 4/ ffmpeg use extension codecs to support proprietary video. Are you sure
> to have the right ffmpeg version installed with all video codecs.
> 5/ With mys experiment when i tune the wrapper code, MP4 and MKV are the
> best video format. MP4 for ex, is very well documented with a full support
> of metadata (Thanks to Apple for that).
> 
> Voilà
> 
> Gilles Caulier
> 
> Le sam. 6 oct. 2018 à 16:39, meku <digikam at meku.org> a écrit :
> > Different cameras store some of the video dates as UTC or localtime. I
> > think Digikam-6.0 is expecting that it is always stored as UTC and then
> > converting to the local timezone.
> > 
> > I noticed that my camera that uses localtime also stores an ExifIFD.
> > DateTimeOriginal tag in the video. Maybe Digikam can do some additional
> > tests on the metadata to look for this or other tags and determine if the
> > video is in UTC or not.
> > 
> > On Fri, 5 Oct 2018 at 20:07, Guy Rutenberg <guyrutenberg at gmail.com> wrote:
> >> Hi,
> >> 
> >> I've got couple of MTS videos (shot using Sony a6000), and it seems that
> >> Digikam fails to parse the tags from the file. I've tried both digikam
> >> 5.9
> >> and the 6.0 beta. I saw that there were improvements to metadata handling
> >> in 6.0, but it didn't solve it. The thing that bothers me the most is
> >> incorrect time associated with the videos (it seems digikam is using
> >> modification time of the file, while ignoring the timezone), which means
> >> that the videos are not sorted correctly compared to the JPEGs.
> >> 
> >> I've checked with exiftool and the MTS files indeed contain the correct
> >> metadata (including maker and model which are not parsed at all by
> >> digikam).
> >> 
> >> I don't remember such problems with mp4 videos in the past. Am I doing
> >> something wrong?
> >> 
> >> Thanks,
> >> Guy