[FFmpeg-trac] #10638(ffmpeg:new): Muxing .mkv and .ivf (av1) source results in "Attachment stream 11 has no filename tag" + broken output mkv

[FFmpeg]

#10638: Muxing .mkv and .ivf (av1) source results in "Attachment stream 11 has no
filename tag" + broken output mkv
-------------------------------------+-------------------------------------
             Reporter:  JouMxyzptlk  |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:  ffmpeg
              Version:  git-master   |               Resolution:
             Keywords:  muxing       |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by mkver):

 * keywords:  muxing av1 => muxing regression
 * priority:  normal => important
 * component:  undetermined => ffmpeg
 * reproduced:  0 => 1

Comment:

 Regression since 653ee3f159411a1b97c19b96393a39f29569ed99.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10638#comment:2>
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