[FFmpeg-trac] #4209(avformat:open): GPS coordinates location and other iOS metadata in MOV are not copied to output MP4

[FFmpeg]

#4209: GPS coordinates location and other iOS metadata in MOV are not copied to
output MP4
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             Reporter:  elmimmo     |                    Owner:  (none)
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mov         |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Comment (by Oleksandr):

 I believe the cause of this bug is the improper location of the `meta` tag
 as it was suggested by TimvW1984.

 I faced the same issue as the ticket's reporter: iOS doesn't show the
 location if media files were created by FFmpeg. After some analysis
 independently of TimvW1984, I've found where FFmpeg and iOS put their
 metadata tags:

 FFmpeg: `moov/udta/meta`
 iOS: `moov/meta`

 Furthermore, Apple's QuickTime specification [1] defines the correct
 location for the metadata tag:

 > Within a QuickTime file, metadata can be stored within a movie atom
 (‘moov’), a track atom (‘trak’) or a media atom (‘mdia’). Only one
 metadata atom is allowed for each location.

 The current FFmpeg implementation contradicts this specification and
 writes it inside the `udta` tag[2].

 From that, I can conclude this is the cause of why location metadata is
 not recognized by Apple's software.

 [1]:
 https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/Metadata/Metadata.html

 [2]:
 https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/refs/heads/release/5.0:/libavformat/movenc.c#l4054
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/4209#comment:25>
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