Created attachment 103142 [details] Suprising displayed dates in metadata panel for video files Hello, Digikam allow to manage both pictures and movies files and metadata are displayed for both these 2 kind of files. But Date metadatas are displayed in a very uncommon way in the right panel which display the embedded metadata (see screenshot). It seems this is an issue in digikam: if I use an different software like exiftool to fetch metadata dates, they are displayed correctly: $: exiftool /home/marc/pictures/GOPR0022.MP4 | grep Date File Modification Date/Time : 2013:01:02 12:23:11+01:00 File Access Date/Time : 2017:01:01 19:52:08+01:00 File Inode Change Date/Time : 2017:01:01 19:45:55+01:00 Modify Date : 2013:01:02 18:23:11 Track Create Date : 2013:01:02 18:23:11 Track Modify Date : 2013:01:02 18:23:11 Media Create Date : 2013:01:02 18:23:11 Media Modify Date : 2013:01:02 18:23:11 Date/Time Original : 2013:01:02 12:23:11 Create Date : 2013:01:02 12:23:11 This issue seems related to #316882 which is marked as fixed, but I'm still encounter this problem with 5.3 coming from ppa. Regards
First, digiKam do not use Exiftool to extract metadata. It use Exiv2 instead. Second, Exiv2 0.26 support better video metadata. We include this version of library (not yet released), in universal Linux AppImage bundle. Please try with this digiKam 5.4.0 pre-release available here : https://drive.google.com/drive/folders/0BzeiVr-byqt5Y0tIRWVWelRJenM Gilles Caulier
Hello Gilles, First, thanks for your quick answer. I haven't the required knowledge to judge which is the better API to process metadata: exiftool example was just to identify which component is responsible of this display. I'll give you a feedback with the 5.4 version. Regards
Confirmed on 5.4.0. For all mp4 files digiKam used a file modification date instead of any content create date from metadata. Looks like exiv2 does not read any metadata from mp4 files yet.
I am wondering if this might help: https://discuss.pixls.us/t/organize-images-videos-in-folders-by-month-date-taken/3156/10?u=andrius There is a link to a piece of code of Rapid Photo Downloader responsible for reading video files' creation date in the post. I tested it on my machine and it worked well, all video files went to correct date folders
Mediainfo reads the date well: mediainfo FILE.mp4 | grep "Encoded date" | head -n 1 Example output: Encoded date : UTC 2012-01-08 11:16:19
Hello Gilles, This message also applicable to: https://bugs.kde.org/show_bug.cgi?id=377072 https://bugs.kde.org/show_bug.cgi?id=377177 It turned out that ffmpeg is already able to read a lot of metadata we could use. Here is an output of an ffmeg -i command on a sample file: --- Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/mnt/data/FamilyPictures/2016/2016-10/20161008/20161007_190516.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: isommp42 creation_time : 2016-10-08T01:10:04.000000Z location : +50.8893-114.0159/ location-eng : +50.8893-114.0159/ com.android.version: 6.0.1 Duration: 00:00:43.20, start: 0.000000, bitrate: 16947 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 16876 kb/s, 29.78 fps, 29.92 tbr, 90k tbn, 180k tbc (default) Metadata: rotate : 90 creation_time : 2016-10-08T01:10:04.000000Z handler_name : VideoHandle Side data: displaymatrix: rotation of -90.00 degrees Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default) Metadata: creation_time : 2016-10-08T01:10:04.000000Z handler_name : SoundHandle --- Reading just these three fields creation_time : 2016-10-08T01:10:04.000000Z location : +50.8893-114.0159/ rotate : 90 (or displaymatrix: rotation of -90.00 degrees) will allow digiKam to: 1. Import video files in correct folders, rename them correctly on import 2. Show video files in chronological order when sort by date 3. Show video files on the map, add GPS information to the database 4. Preview video correctly per the rotation tag, create correct video thumbnails Is that possible to add the support of this on your roadmap? Let me know your thoughts. https://github.com/wang-bin/QtAV/issues/820#issuecomment-287545695
yes, we can do it through QtAV. Try to use stand alone QtAv Player. Load a video and go to Info pannel. These ffmpeg metadata are there. So i'm sure more and less that QtAV can provide all these kind of data to client application as digiKam, without to use directly ffmpeg (and add direct ffpmeg dependencies to digiKam. Gilles Caulier
(In reply to caulier.gilles from comment #7) > yes, we can do it through QtAV. > > Try to use stand alone QtAv Player. Load a video and go to Info pannel. > These ffmpeg metadata are there. So i'm sure more and less that QtAV can > provide all these kind of data to client application as digiKam, without to > use directly ffmpeg (and add direct ffpmeg dependencies to digiKam. > > Gilles Caulier It can write too. I just wrote GPS location into mp4 file using this command ffmpeg -i inputfile -metadata location="+50.8893-114.0159/" outputfile
Very interesting. Do you know if there is already somewhere a c++ interface to ffmpeg to read/write metadata on video ?
(In reply to caulier.gilles from comment #9) > Very interesting. Do you know if there is already somewhere a c++ interface > to ffmpeg to read/write metadata on video ? Is this close to what you are looking for? https://ffmpeg.org/doxygen/2.0/doc_2examples_2metadata_8c-example.html
With 6.0.0, we have now a FFMpeg low level metadata parser based on libav C API for video files database registration. The Exiv2 video support is not used anymore as this code is buggous and nobody sound motivated in Exiv2 to finalize the code. The original post for this file must be fixed now and video metadata support with ffmpeg must be enough to populate database entries. Gilles Caulier