[FFmpeg-trac] #8445(avcodec:reopened): memory leak using h264_qsv to encode under certain resolutions

[FFmpeg]

#8445: memory leak using h264_qsv to encode under certain resolutions
-------------------------------------+-------------------------------------
             Reporter:  carlchen     |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  h264_qsv     |               Blocked By:
  encoder leak                       |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by lveilleux):

 * keywords:  qsv leak => h264_qsv encoder leak
 * status:  closed => reopened
 * version:  unspecified => git-master
 * resolution:  needs_more_info =>


Comment:

 I added an attachment, containing VS2019 solution/project/source. I linked
 this with nightly build ffmpeg-20200615-9d80f3e-win64-shared (GPL).

 I ran memory check using sysinternals' VMMap, which is also included in
 the attachment (both the utility and the results). Basically, the small
 Win64 console app runs 3 tests, there's a "pause" command in between each
 to allow taking a snapshot of memory. The tests are:
 - Open h264_qsv, encode 60 frames at 1280x720, close codec, run that 5
 times (heap size increases just a few KBs after this)
 - Open h264_qsv, encode 60 frames at 1280x1024, close codec, run that 5
 times (heap size increases 80MB after this)
 - Open h264_qsv, encode 60 frames at 1920x1080, close codec, run that 5
 times (heap size increases just a few KBs after this)

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Ticket URL: <https://trac.ffmpeg.org/ticket/8445#comment:9>
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