Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Michael Niedermayer):

 Replying to [comment:15 Niklas Haas]:
 > Looking at this problem again, I do agree that the logic is clearly too
 confusing. There are too many special cases and interacting code paths.
 >
 > I propose we just revert the problematic cedf5 for now, which produces
 behavior identical to the status quo.
 >
 > We can fix it properly as part of the planned refactoring efforts.

 ok

 also the libswscale/tests/swscale should be turned into a fate test. With
 -p 0.02 it tests 2% of the cases and passes in ~9 sec, something like that
 seems practical
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Niklas Haas):

 Looking at this problem again, I do agree that the logic is clearly too
 confusing. There are too many special cases and interacting code paths.

 I propose we just revert the problematic cedf5 for now, which produces
 behavior identical to the status quo.

 We can fix it properly as part of the planned refactoring efforts.
-- 
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Michael Niedermayer):

 Replying to [comment:10 Niklas Haas]:
 > Michael, the change in behavior is caused by "swscale: don't assign
 range converters for float" in isolation. That patch is orthogonal to the
 bug fix for this issue, which is in these patches:
 >
 > swscale/utils: correctly return from sws_init_single_context
 > and
 > swscale/utils: don't early return in yuv alpha blendaway
 >
 >
 > So we can merge those two to fix 7.0 without causing the change in
 behavior you observed.

 these 2 patches cause the code to segfault

 gray -> grayf32le
  gray 96x96 -> grayf32le  64x 64 flags= 1 CRC=78e674b6 SSD=0,0,
 0,0
  gray 96x96 -> grayf32le  64x 96 flags= 1 CRC=e797f06f SSD=0,0,
 0,0
  gray 96x96 -> grayf32le  64x128 flags= 1 CRC=02c0a369 SSD=0,0,
 0,0
  gray 96x96 -> grayf32le  96x 64 flags= 1 CRC=de03cdea SSD=0,0,
 0,0
  gray 96x96 -> grayf32le  96x 96 flags= 1
 Program received signal SIGSEGV, Segmentation fault.
 0x5556d3eb in ff_init_vscale_pfn (c=0x5588e580,
 yuv2plane1=0x0, yuv2planeX=0x0, yuv2nv12cX=0x0, yuv2packed1=0x0,
 yuv2packed2=0x0, yuv2packedX=0x0, yuv2anyX=0x0, use_mmx=0) at
 libswscale/vscale.c:285
 285 lumCtx = c->desc[idx].instance;
 (gdb) bt
 #0  0x5556d3eb in ff_init_vscale_pfn (c=0x5588e580,
 yuv2plane1=0x0, yuv2planeX=0x0, yuv2nv12cX=0x0, yuv2packed1=0x0,
 yuv2packed2=0x0, yuv2packedX=0x0, yuv2anyX=0x0, use_mmx=0) at
 libswscale/vscale.c:285
 #1  0xf5e6 in swscale (c=0x5588e580, src=0x7fffdd00,
 srcStride=0x7fffdce0, srcSliceY=0, srcSliceH=96, dst=0x7fffdd20,
 dstStride=0x7fffdcf0, dstSliceY=0, dstSliceH=96) at
 libswscale/swscale.c:355
 #2  0x55562332 in scale_internal (c=0x5588e580,
 srcSlice=0x5584e0e0 , srcStride=0x5584e0c0 ,
 srcSliceY=0, srcSliceH=96, dstSlice=0x7fffde20,
 dstStride=0x7fffde10, dstSliceY=0, dstSliceH=96) at
 libswscale/swscale.c:1046
 #3  0x55562aca in sws_scale (c=0x5588e580,
 srcSlice=0x5584e0e0 , srcStride=0x5584e0c0 ,
 srcSliceY=0, srcSliceH=96, dst=0x7fffde20, dstStride=0x7fffde10)
 at libswscale/swscale.c:1213
 #4  0xcef9 in doTest.constprop.2 ()
 #5  0xdb65 in main ()

 git log --oneline  -2
 75a1ccaaadf (HEAD) swscale/utils: don't early return in yuv alpha
 blendaway
 73a54cdb697 swscale/utils: correctly return from sws_init_single_context
-- 
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Michael Niedermayer):

 here it seems working if i revert cedf589c09c567b72bf4c1a58db53d94622567e1

 git revert  cedf589c09c567b72bf4c1a58db53d94622567e1

 libswscale/tests/swscale -src grayf32le -dst gray8
 grayf32le -> gray
  grayf32le 96x96 -> gray  64x 64 flags= 1 CRC=3f585472 SSD=3,0,
 0,0
  grayf32le 96x96 -> gray  64x 96 flags= 1 CRC=f4f441fa SSD=3,0,
 0,0
  grayf32le 96x96 -> gray  64x128 flags= 1 CRC=31414fc6 SSD=3,0,
 0,0
  grayf32le 96x96 -> gray  96x 64 flags= 1 CRC=8fab767b SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 96 flags= 1 CRC=60e3a5c4 SSD=   24,0,
 0,0
  grayf32le 96x96 -> gray  96x128 flags= 1 CRC=775eb332 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 64 flags= 1 CRC=823bfb7e SSD=1,0,
 0,0
  grayf32le 96x96 -> gray 128x 96 flags= 1 CRC=2aec02c1 SSD=1,0,
 0,0
  grayf32le 96x96 -> gray 128x128 flags= 1 CRC=7da830ff SSD=1,0,
 0,0
  grayf32le 96x96 -> gray  64x 64 flags= 2 CRC=910f3536 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 96 flags= 2 CRC=1640a27e SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x128 flags= 2 CRC=e6e9cb5a SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 64 flags= 2 CRC=a8d1449f SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 96 flags= 2 CRC=60e3a5c4 SSD=   24,0,
 0,0
  grayf32le 96x96 -> gray  96x128 flags= 2 CRC=c0acf483 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 64 flags= 2 CRC=4c7f3a3a SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 96 flags= 2 CRC=07a18ab4 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x128 flags= 2 CRC=7cbbfb24 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 64 flags= 4 CRC=0bea2826 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 96 flags= 4 CRC=8ff04a34 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x128 flags= 4 CRC=696847b0 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 64 flags= 4 CRC=8a829b68 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 96 flags= 4 CRC=60e3a5c4 SSD=   24,0,
 0,0
  grayf32le 96x96 -> gray  96x128 flags= 4 CRC=a2b1d0f2 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 64 flags= 4 CRC=259b2db8 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 96 flags= 4 CRC=b86dd1dd SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x128 flags= 4 CRC=4441dc68 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 64 flags= 8 CRC=6c4bfa06 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 96 flags= 8 CRC=aa5e1dd7 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x128 flags= 8 CRC=9ba24c03 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 64 flags= 8 CRC=999a8f88 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 96 flags= 8 CRC=60e3a5c4 SSD=   24,0,
 0,0
  grayf32le 96x96 -> gray  96x128 flags= 8 CRC=8f122a65 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 64 flags= 8 CRC=0cdc855e SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 96 flags= 8 CRC=7e39bf09 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x128 flags= 8 CRC=abfac6de SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 64 flags=16 CRC=32a33b4e SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 96 flags=16 CRC=659ecd11 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x128 flags=16 CRC=e53ed1cd SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 64 flags=16 CRC=ae788ddd SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 96 flags=16 CRC=60e3a5c4 SSD=   24,0,
 0,0
  grayf32le 96x96 -> gray  96x128 flags=16 CRC=370a4afc SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 64 flags=16 CRC=74ddd3cd SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x 96 flags=16 CRC=312958ba SSD=0,0,
 0,0
  grayf32le 96x96 -> gray 128x128 flags=16 CRC=c1039dc4 SSD=1,0,
 0,0
  grayf32le 96x96 -> gray  64x 64 flags=32 CRC=18abdf63 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x 96 flags=32 CRC=4bd9bbef SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  64x128 flags=32 CRC=64121e69 SSD=0,0,
 0,0
  grayf32le 96x96 -> gray  96x 64 flags=32 CRC=ad4696b3 SSD=0,0,

Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Niklas Haas):

 This still fails without the patch:

 libswscale/tests/swscale -src grayf32le -dst gray8
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Niklas Haas):

 Looking at it some more, it appears to be a regression. The patch in
 question is definitely not correct as-is. The condition was made overly
 broad, and in retrospect, is probably unnecessary.

 I will investigate some more; in particular we need to make sure that the
 unscaled float_y_to_uint_y wrapper works as intended. But if that already
 works on master, that patch should probably just be dropped.
-- 
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Niklas Haas):

 Michael, the change in behavior is caused by
 c97875e58d7412232cdd30c0c75764e14e6cd004 in isolation. That patch is
 orthogonal to the bug fix for this issue, which is in these patches:

 swscale/utils: correctly return from sws_init_single_context
 and
 swscale/utils: don't early return in yuv alpha blendaway


 So we can merge those two to fix 7.0 without causing the change in
 behavior you observed.
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Balling):

 I mean the patch does make sense: the floating point doesn't have a color
 range, because color range is also called quantization range, and
 quantization is the process of transforming float to integer. Float thus
 has not range.

 But then again as I understand our float to integer and vice versa is not
 perfect.
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by Michael Niedermayer):

 Reverting cedf589c09c567b72bf4c1a58db53d94622567e1 results in:
 libswscale/tests/swscale -src gbrapf32le -dst yuvj422p 2>/dev/null
 gbrapf32le -> yuvj422p
  gbrapf32le 96x96 -> yuvj422p  64x 64 flags= 1 CRC=41449464 SSD=3,
 48,   53,0
  gbrapf32le 96x96 -> yuvj422p  64x 96 flags= 1 CRC=3e739b4a SSD=3,
 48,   53,0
  gbrapf32le 96x96 -> yuvj422p  64x128 flags= 1 CRC=e361b8b0 SSD=3,
 48,   53,0
  gbrapf32le 96x96 -> yuvj422p  96x 64 flags= 1 CRC=94d92638 SSD=0,
 13,   14,0
  gbrapf32le 96x96 -> yuvj422p  96x 96 flags= 1 CRC=968f181c SSD=0,
 13,   14,0
  gbrapf32le 96x96 -> yuvj422p  96x128 flags= 1 CRC=d6c89e6a SSD=0,
 13,   14,0
  gbrapf32le 96x96 -> yuvj422p 128x 64 flags= 1 CRC=6f6fc49e SSD=1,
 4,4,0
  gbrapf32le 96x96 -> yuvj422p 128x 96 flags= 1 CRC=e3f7c8a2 SSD=1,
 4,4,0
  gbrapf32le 96x96 -> yuvj422p 128x128 flags= 1 CRC=3707f630 SSD=1,
 4,4,0
  gbrapf32le 96x96 -> yuvj422p  64x 64 flags= 2 CRC=a3ce44a3 SSD=0,
 2,2,0
  gbrapf32le 96x96 -> yuvj422p  64x 96 flags= 2 CRC=aa4b48dc SSD=0,
 2,2,0
  gbrapf32le 96x96 -> yuvj422p  64x128 flags= 2 CRC=b436b256 SSD=0,
 2,2,0
  gbrapf32le 96x96 -> yuvj422p  96x 64 flags= 2 CRC=04056f28 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  96x 96 flags= 2 CRC=c7f13987 SSD=0,
 1,0,0
  gbrapf32le 96x96 -> yuvj422p  96x128 flags= 2 CRC=24b31c76 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p 128x 64 flags= 2 CRC=cfe9c513 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p 128x 96 flags= 2 CRC=33b3dd30 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p 128x128 flags= 2 CRC=99a3dbee SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  64x 64 flags= 4 CRC=5241639b SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  64x 96 flags= 4 CRC=fe8e9316 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  64x128 flags= 4 CRC=121ba0bc SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  96x 64 flags= 4 CRC=5021f513 SSD=0,
 0,0,0
  gbrapf32le 96x96 -> yuvj422p  96x 96 flags= 4 CRC=860fc2f8 SSD=0,
 0,0,0
  gbrapf32le 96x96 -> yuvj422p  96x128 flags= 4 CRC=12064d69 SSD=0,
 0,0,0
  gbrapf32le 96x96 -> yuvj422p 128x 64 flags= 4 CRC=5bee6afd SSD=0,
 1,0,0
  gbrapf32le 96x96 -> yuvj422p 128x 96 flags= 4 CRC=ddd3fe7b SSD=0,
 1,0,0
  gbrapf32le 96x96 -> yuvj422p 128x128 flags= 4 CRC=825aa470 SSD=0,
 1,0,0
  gbrapf32le 96x96 -> yuvj422p  64x 64 flags=524296 CRC=babf7364 SSD=0,
 2,2,0
  gbrapf32le 96x96 -> yuvj422p  64x 96 flags=524296 CRC=3e320f86 SSD=0,
 2,2,0
  gbrapf32le 96x96 -> yuvj422p  64x128 flags=524296 CRC=2078a0df SSD=0,
 2,2,0
  gbrapf32le 96x96 -> yuvj422p  96x 64 flags=524296 CRC=dc33bd61 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  96x 96 flags=524296 CRC=a6af96ce SSD=0,
 1,0,0
  gbrapf32le 96x96 -> yuvj422p  96x128 flags=524296 CRC=406a9e37 SSD=0,
 1,0,0
  gbrapf32le 96x96 -> yuvj422p 128x 64 flags=524296 CRC=9140e242 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p 128x 96 flags=524296 CRC=9b4e1039 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p 128x128 flags=524296 CRC=de2604d7 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  64x 64 flags=16 CRC=322c7c51 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  64x 96 flags=16 CRC=6d9e9b34 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  64x128 flags=16 CRC=fa8e4b23 SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  96x 64 flags=16 CRC=936a0a63 SSD=0,
 3,3,0
  gbrapf32le 96x96 -> yuvj422p  96x 96 flags=16 CRC=2bb49996 SSD=0,
 3,2,0
  gbrapf32le 96x96 -> yuvj422p  96x128 flags=16 CRC=86b2d878 SSD=0,
 3,3,0
  gbrapf32le 96x96 -> yuvj422p 128x 64 flags=16 CRC=836854ca SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p 128x 96 flags=16 CRC=1a6a3fcc SSD=0,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p 128x128 flags=16 CRC=ff0b9a5e SSD=1,
 1,1,0
  gbrapf32le 96x96 -> yuvj422p  64x 64 flags=262176 CRC=802f41b0 SSD=0,
 2,2,0
  gbrap

Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Comment (by haasn):

 The fix for this bug has actually been on the mailing list since november:

 https://ffmpeg.org//pipermail/ffmpeg-devel/2023-November/317031.html

 But you blocked it at the time because you did not like the way the logic
 flows. I think that we should either merge the above fix to unblock 7.0,
 or else, we can possibly revert cedf589c09c567 for the time being. (It is
 no longer needed for us as of my vf_scale rewrite, although it would re-
 introduce a bug that libswscale API users can still hit in principle)
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Re: [FFmpeg-trac] #10824(swscale:open): swscale self tests fail with assertion since recent changes

[FFmpeg]

#10824: swscale self tests fail with assertion since recent changes
-+-
 Reporter:  Michael  |Owner:  (none)
  Niedermayer|
 Type:  defect   |   Status:  open
 Priority:  important|Component:  swscale
  Version:  git-master   |   Resolution:
 Keywords:  assert,  |   Blocked By:
  regression |
 Blocking:  7.0  |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-
Changes (by Michael Niedermayer):

 * component:  undetermined => swscale

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