[FFmpeg-trac] #1439(ffmpeg:closed): "creation_time" metadata incorrect in mov files

FFmpeg trac at avcodec.org
Thu Mar 5 01:08:20 EET 2020


#1439: "creation_time" metadata incorrect in mov files
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             Reporter:  nichot20    |                    Owner:
                 Type:  defect      |                   Status:  closed
             Priority:  normal      |                Component:  ffmpeg
              Version:  git-master  |               Resolution:  fixed
             Keywords:              |               Blocked By:
             Blocking:  8552        |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Changes (by UlfZibis):

 * cc: Ulf.Zibis@… (added)
 * blocking:   => 8552


Comment:

 I have a different opinion to this issue.[[BR]]
 I see "creation_time" as the time, when the video was originally recorded.
 This time should not change on transcoding, so could be preserved. The
 file creation time is anyway saved from the underlying OS in the file
 system.[[BR]]
 If ffmpeg sees the "creation_time" as time of encoding, why doesn't it set
 to the current time, but leaves it empty?

 Linux tool "mediainfo" distinguishes between "Encoded date" and "Tagged
 date". Which one is interpreted as "creation_time" by ffmpeg?

 As another distinction in JPEG EXIF we find "DateTimeOriginal" and
 "DateTimeDigitized".

 The current behaviour prevents -f ffmatadata to report the global
 "creation_time", see #8552

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Ticket URL: <https://trac.ffmpeg.org/ticket/1439#comment:2>
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