[FFmpeg-trac] #9398(undetermined:new): mpeg4_unpack_bframes don't work in Powershell 7

[FFmpeg]

#9398: mpeg4_unpack_bframes don't work in Powershell 7
-------------------------------------+-------------------------------------
             Reporter:  Arnab        |                     Type:  defect
  Animesh Das                        |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: When mpeg4_unpack_bframes bitstream filter is run in
 Powershell it shows the following error:

 {{{
 [NULL @ 00000235ef2ebd00] Unable to find a suitable output format for
 'mpeg4_unpack_bframes'
 mpeg4_unpack_bframes: Invalid argument
 }}}

 In the command prompt, it works fine. I am using Windows 10 x64 21H1. You
 can use any avi video for this purpose.

 How to reproduce:
 {{{
 % ffmpeg -i i.avi -bsf:v mpeg4_unpack_bframes -codec copy o.avi
 ffmpeg version n4.4-78-g031c0cb0b4-20210709 Copyright (c) 2000-2021 the
 FFmpeg developers
   built with gcc 10-win32 (GCC) 20210408
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9398>
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