[FFmpeg-trac] #5963(undetermined:new): Improve "unknown side data type" warning

[FFmpeg]

#5963: Improve "unknown side data type" warning
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             Reporter:               |                    Owner:
  michael.heuberger                  |                   Status:  new
                 Type:  enhancement  |                Component:
             Priority:  minor        |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  usability,   |               Blocked By:
  warning                            |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by michael.heuberger):

 I hear you, thanks. But it's irritating because this string is printed via
 stderr, not via stdout, hence interpreted as a warning/error.

 Btw, I have installed ffmpeg via apt-get on Ubuntu 16.10 - there is no
 newer build avail.

 But still, since I care about the videos I encode for the heavily used
 https://www.videomail.io site, I really want to understand what "unknown
 side data type" means and where it comes from.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5963#comment:3>
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