Exiv2 bug reports

[Gilles Caulier]

Hi Andrey,

Yes, QtAV use ffmpeg, and ffmpeg is an indirect dependency to digiKam.

I like the link to stackoverflow. This can mean that writting metadta
to video files can be done easily with ffmpeg. I think reading must be
true also...

Look this report done to QtAV bugzilla :

https://github.com/wang-bin/QtAV/issues/820

This entry must be implemented in QtAV. It's really important. Comment
in this entry to promote the feature to QtAV developers.

Gilles Caulier

2017-07-06 22:48 GMT+02:00 Andrey Goreev <aegoreev at gmail.com>:
> Here is my initial email. :)
>
> Hello Gilles,
>
> Thank you for taking the time for this.
>
> How about ffmpeg? QtAV relies on it so it is probably already a part of the
> appimage.
> ffmpeg can read and write QuickTime tags (
> https://developer.apple.com/library/content/documentation/QuickTime/QTFF/Metadata/Metadata.html#//apple_ref/doc/uid/TP40000939-CH1-SW43
> ) very well.
> I think all we need is to read/write:
> 1. Creation date
> 2. Title
> 3. Description
> 4. Keywords (tags)
> 5. Location (GPS)
> 6. Rating
> 7. Author
>
> I could not figure out how to write keywords and rating using ffmpeg but all
> the rest it can do.
> We could write keywords to the field "comments" instead.
> Rating..we can leave without it
> What do you think?
>
> Best regards,
> Andrey
>
> On Sat, Jun 10, 2017 at 5:06 AM, Gilles Caulier <caulier.gilles at gmail.com>
> wrote:
>>
>> Hi all
>>
>> Some news about the Video metadata support plan :
>>
>> 1/ I investigated the ExifTool way. The time latency introduced by
>> QProcess to run Perl script is too much important. It's acceptable for
>> some image, but for a large collection scan, it's inacceptable. Even
>> if metadata support is excellent, i will forget Exiftool...
>>
>> 2/ I take a look to MediaInfo. A lib is available de facto under
>> Linux. Even project management (source code, compilation rules,
>> compiler support) is not strong from my point of view, the code must
>> be compilable for all bundle. It sound like this project is maintained
>> under Windows, and other platform only provided as well. I'm not sure.
>> The interface is not to much complicated to wrap with digiKam core. So
>> i will study this way for the future.
>>
>> 3/ No news from Exiv2 since the 0.26 release. Only few bugzilla
>> entries have been created with some response, but no more. Sound like
>> Exiv2 switch progressively in frozen mode. I hope that a new
>> maintainer will be found quickly. We really need to see the video
>> supported completed, at least for read only request.
>> NOTE: do not ask me to do this job, in parallel of digiKam...
>>
>> My plan : as we already do for unsupported RAW file by Exiv2, we use
>> libraw to get some metadata that library is able to parse. All are
>> stored in Exiv2 container, so all the rest of digiKam don't need to be
>> touch.
>> I want to do the same for MediaInfo, with a Cmake optional compilation
>> rule.
>>
>> This will provide a minimal support of video metadata, in read only,
>> until a solution will be found with Exiv2 project.
>>
>> Important : i need a new entry in digiKam bugzilla to add video
>> support through MediaInfo. Thanks in advance.
>>
>> Voilà. Constructive comments are welcome.
>>
>> Best
>>
>> Gilles Caulier
>>
>>
>> 2017-04-28 16:24 GMT+02:00 Gilles Caulier <caulier.gilles at gmail.com>:
>> >
>> >
>> > 2017-04-28 15:31 GMT+02:00 NeiNei <neinei at gmx.net>:
>> >>
>> >> Hi there,
>> >>
>> >> the long awaited release of Exiv2 v0.26 should be released today
>> >> according
>> >> to http://dev.exiv2.org/boards/3/topics/2830
>> >> However, I do not know wether or how it will change the situation for
>> >> DigiKam.
>> >
>> >
>> > Nothing news with Exiv2 0.26, as i already use current code from svn
>> > server
>> > in all bundle (so pre 0.26 release)
>> >
>> >
>> >
>> >>
>> >> As far as I understood Gilles thoroughly checks for alternatives in
>> >> order
>> >> to ensure a working, evolving and reliable metadata editor for DigiKam.
>> >>
>> >
>> > yes. No code is done yet. I plan to make some demo code soon with
>> > Exiftool
>> > c++ interface, when time permit.
>> >
>> > Gilles
>> >
>
>