[FFmpeg-trac] #5879(avformat:new): Remove all metadata does not work with MKV files

[FFmpeg]

#5879: Remove all metadata does not work with MKV files
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             Reporter:  Kdmeizk      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mkv          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by Kdmeizk):

 I don't really understand what you mean with "use-case".

 I'm using one of the latest builds from https://ffmpeg.zeranoe.com/builds/

 And the result from MediaInfo:


 {{{
 Video
 ID                                       : 1
 Format                                   : VP9
 Codec ID                                 : V_VP9
 Duration                                 : 3 min 24 s
 Width                                    : 1 920 pixels
 Height                                   : 1 080 pixels
 Display aspect ratio                     : 16:9
 Frame rate mode                          : Constant
 Frame rate                               : 29.970 (30000/1001) FPS
 Language                                 : English
 Default                                  : Yes
 Forced                                   : No
 DURATION                                 : 00:03:24.203000000

 Audio
 ID                                       : 2
 Format                                   : FLAC
 Format/Info                              : Free Lossless Audio Codec
 Codec ID                                 : A_FLAC
 Duration                                 : 3 min 24 s
 Bit rate mode                            : Variable
 Channel(s)                               : 2 channels
 Channel positions                        : Front: L R
 Sampling rate                            : 48.0 kHz
 Bit depth                                : 16 bits
 Default                                  : No
 Forced                                   : No
 DURATION                                 : 00:03:24.220000000


 }}}


 It can calculate or retrieve the duration one time, that's why the second
 '''DURATION''' is not useful for me, and impossible to delete.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5879#comment:3>
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