[FFmpeg-trac] #3701(avcodec:open): adpcm-ima_qt encoder's trellis support is broken

[FFmpeg]

#3701: adpcm-ima_qt encoder's trellis support is broken
-------------------------------------+-------------------------------------
             Reporter:  Timothy_Gu   |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  adpcm        |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * priority:  normal => important


Comment:

 I originally thought that mentioned commit improved quality but I actually
 get the following with older FFmpeg and trellis so imo this is definitely
 a regression:
 {{{
 stddev:  732.40 PSNR: 39.03 MAXDIFF:29633 bytes:  1058400/  1058560
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3701#comment:2>
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