[FFmpeg-trac] #9462(undetermined:new): Ffmpeg not removing unwanted metadata

FFmpeg trac at avcodec.org
Sun Oct 24 21:51:01 EEST 2021

#9462: Ffmpeg not removing unwanted metadata
             Reporter:  steipal      |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  METADATA     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
Comment (by FranceBB):

 Hi there,
 this is Frank from Sky.
 Those properties being passed through is very concerning.
 I tried to remux the MP4 created with FFMpeg with MP4Box and they were
 still there.
 This is important 'cause we send out lots of MP4 to third party services,
 some of which are literally just TVs running our ads in shops where people
 generally go to buy a TV and given the overwhelmingly increasing number of
 TV sets supporting HDR, I'm not really sure what would happen if we give
 them an BT709 file with the metadata of HDR PQ like we're doing in this
 Worse case scenario: they will interpret it LITERALLY so PQ transfer with
 the BT709 matrix and really bad things will happen.
 This is not ok.
 There should be a good standardized way in FFMpeg to get rid of those kind
 of metadata without going through Avisynth in the first place.
Ticket URL: <https://trac.ffmpeg.org/ticket/9462#comment:5>
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