[FFmpeg-trac] #9901(undetermined:new): Bug: ffmpeg/ffprobe calls field different from it's header.

[FFmpeg]

#9901: Bug: ffmpeg/ffprobe calls field different from it's header.
-------------------------------------+-------------------------------------
             Reporter:  NY2Da        |                    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            |
-------------------------------------+-------------------------------------
Description changed by NY2Da:

Old description:

> - ffprobe calls Description field comment
> Test Method-
> 1. Remove all tags from a file using MP3Tag.
> 2. create a "extended custom tag" called DESCRIPTION (Not a field already
> in software so you can be sure what header it is) and enter some value.
> 3. Then check with ffbrobe.
> Result-
>
> mp3tag
> https://preview.redd.it/30bl1thk1el91.png?width=642&format=png&auto=webp&s=e8fde094c28b0f0205a496b7b12b0d25ddd744a5
> ffprobe
> https://preview.redd.it/ul7a79jl1el91.png?width=467&format=png&auto=webp&s=1f94aacc7a97e8b81db4cdebc38122faab243324
>
> - ffmpeg and ffprobe have different behaviors one calls the same field
> comment the other DESCRIPTION -
> experiment done by u/wierd (r/youtubedl mod)
> r/youtubedl/comments/wxkpv8/comment/ilzy6ow -
>
> i have a clean opus file, no metadata. i add metadata to it like this.
> ffmpeg -i clean.251.opus -metadata 'description=this is a description'
> -metadata 'comment=this is a comment' -metadata 'random=this is a random
> field' -metadata 'synopsis=this is the synopsis field' new.opus
> ffmpeg output:
> Output #0, opus, to 'new.opus':
>   Metadata:
>     description     : this is a description
>     comment         : this is a comment                     <---
>     random          : this is a random field
>     synopsis        : this is the synopsis field
>     encoder         : Lavf58.76.100
>   Stream #0:0(eng): Audio: opus, 48000 Hz, stereo, flt, 96 kb/s
>     Metadata:
>       encoder         : Lavc58.134.100 libopus
>       DESCRIPTION     : this is a comment                   <---
>       random          : this is a random field
>       synopsis        : this is the synopsis field
> first part lists description, comment, random, synopsis. second partg
> lists DESCRIPTION with the comment contents.
> but... ffprobe:
> Input #0, ogg, from 'new.opus':
>   Duration: 00:06:06.40, start: 0.000000, bitrate: 94 kb/s
>   Stream #0:0(eng): Audio: opus, 48000 Hz, stereo, fltp
>     Metadata:
>       encoder         : Lavc58.134.100 libopus
>       comment         : this is a comment                  <---
>       random          : this is a random field
>       synopsis        : this is the synopsis field
> here it lists the comment as comment but description is not shown.
> --------
> Summary of the bug:
> How to reproduce:
> {{{
> % ffmpeg -i input ... output
> ffmpeg version
> built on ...
> }}}
> Patches should be submitted to the ffmpeg-devel mailing list and not this
> bug tracker.

New description:

 - ffprobe calls Description field comment
 Test Method-
 1. Remove all tags from a file using MP3Tag.
 2. create a "extended custom tag" called DESCRIPTION (Not a field already
 in software so you can be sure what header it is) and enter some value.
 3. Then check with ffbrobe.

 Result-
 mp3tag - ffprobe - See Images Attached
 https://trac.ffmpeg.org/attachment/ticket/9901/ul7a79jl1el91.webp
 https://trac.ffmpeg.org/attachment/ticket/9901/30bl1thk1el91.webp

 - ffmpeg and ffprobe have different behaviors one calls the same field
 comment the other DESCRIPTION -
 experiment done by u/wierd (r/youtubedl mod)
 r/youtubedl/comments/wxkpv8/comment/ilzy6ow -

 i have a clean opus file, no metadata. i add metadata to it like this.
 ffmpeg -i clean.251.opus -metadata 'description=this is a description'
 -metadata 'comment=this is a comment' -metadata 'random=this is a random
 field' -metadata 'synopsis=this is the synopsis field' new.opus
 ffmpeg output:
 Output #0, opus, to 'new.opus':
   Metadata:
     description     : this is a description
     comment         : this is a comment                     <---
     random          : this is a random field
     synopsis        : this is the synopsis field
     encoder         : Lavf58.76.100
   Stream #0:0(eng): Audio: opus, 48000 Hz, stereo, flt, 96 kb/s
     Metadata:
       encoder         : Lavc58.134.100 libopus
       DESCRIPTION     : this is a comment                   <---
       random          : this is a random field
       synopsis        : this is the synopsis field
 first part lists description, comment, random, synopsis. second partg
 lists DESCRIPTION with the comment contents.
 but... ffprobe:
 Input #0, ogg, from 'new.opus':
   Duration: 00:06:06.40, start: 0.000000, bitrate: 94 kb/s
   Stream #0:0(eng): Audio: opus, 48000 Hz, stereo, fltp
     Metadata:
       encoder         : Lavc58.134.100 libopus
       comment         : this is a comment                  <---
       random          : this is a random field
       synopsis        : this is the synopsis field
 here it lists the comment as comment but description is not shown.
 --------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -i input ... output
 ffmpeg version
 built on ...
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
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Ticket URL: <https://trac.ffmpeg.org/ticket/9901#comment:6>
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