[FFmpeg-trac] #11265(undetermined:open): Chroma Artifacts on the right edge of some odd width 4:2:0 videos in ffplay

[FFmpeg]

#11265: Chroma Artifacts on the right edge of some odd width 4:2:0 videos in ffplay
-------------------------------------+-------------------------------------
             Reporter:  Michael      |                    Owner:  Niklas
  Niedermayer                        |  Haas
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  swscale,     |               Blocked By:
  ffplay                             |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Michael Niedermayer):

 * owner:  (none) => Niklas Haas
 * status:  new => open


Old description:

> Summary of the bug:
> How to reproduce:
> {{{
> ./ffplay test25.nut
> use the mouse to scale it up a bit to better see
> and then repeatly press arrow left, each time on the right side a
> different
> mix of colors appears
>
> test25.nut is a mpeg4 yuv420p video with 25x25 size, infact codec and
> content seem not to matter
>
> ==1071990== Conditional jump or move depends on uninitialised value(s)
> ==1071990==    at 0x1324673: av_clip_uint8_c (common.h:208)
> ==1071990==    by 0x13260C3: yuv2plane1_8_c (output.c:426)
> ==1071990==    by 0x12FCC0D: lum_planar_vscale (vscale.c:53)
> ==1071990==    by 0x12F0E0A: swscale (swscale.c:498)
> ==1071990==    by 0x12F320A: scale_internal (swscale.c:1046)
> ==1071990==    by 0x12F239C: scale_cascaded (swscale.c:875)
> ==1071990==    by 0x12F27D4: scale_internal (swscale.c:937)
> ==1071990==    by 0x12F3BBD: ff_sws_slice_worker (swscale.c:1240)
> ==1071990==    by 0x13DC790: run_jobs (slicethread.c:65)
> ==1071990==    by 0x13DC866: thread_worker (slicethread.c:89)
> ==1071990==    by 0x694B608: start_thread (pthread_create.c:477)
> ==1071990==    by 0x6A85352: clone (clone.S:95)
> ==1071990==
> ==1071990== Thread 83:
> ==1071990== Conditional jump or move depends on uninitialised value(s)
> ==1071990==    at 0x1324673: av_clip_uint8_c (common.h:208)
> ==1071990==    by 0x132602D: yuv2planeX_8_c (output.c:416)
> ==1071990==    by 0x12FD038: chr_planar_vscale (vscale.c:100)
> ==1071990==    by 0x12F0E0A: swscale (swscale.c:498)
> ==1071990==    by 0x12F320A: scale_internal (swscale.c:1046)
> ==1071990==    by 0x12F239C: scale_cascaded (swscale.c:875)
> ==1071990==    by 0x12F27D4: scale_internal (swscale.c:937)
> ==1071990==    by 0x12F3BBD: ff_sws_slice_worker (swscale.c:1240)
> ==1071990==    by 0x13DC790: run_jobs (slicethread.c:65)
> ==1071990==    by 0x13DC866: thread_worker (slicethread.c:89)
> ==1071990==    by 0x694B608: start_thread (pthread_create.c:477)
> ==1071990==    by 0x6A85352: clone (clone.S:95)
> ==1071990==
> ==1071990== Conditional jump or move depends on uninitialised value(s)
> ==1071990==    at 0x1324673: av_clip_uint8_c (common.h:208)
> ==1071990==    by 0x132602D: yuv2planeX_8_c (output.c:416)
> ==1071990==    by 0x12FD09E: chr_planar_vscale (vscale.c:101)
> ==1071990==    by 0x12F0E0A: swscale (swscale.c:498)
> ==1071990==    by 0x12F320A: scale_internal (swscale.c:1046)
> ==1071990==    by 0x12F239C: scale_cascaded (swscale.c:875)
> ==1071990==    by 0x12F27D4: scale_internal (swscale.c:937)
> ==1071990==    by 0x12F3BBD: ff_sws_slice_worker (swscale.c:1240)
> ==1071990==    by 0x13DC790: run_jobs (slicethread.c:65)
> ==1071990==    by 0x13DC866: thread_worker (slicethread.c:89)
> ==1071990==    by 0x694B608: start_thread (pthread_create.c:477)
> ==1071990==    by 0x6A85352: clone (clone.S:95)
>
> }}}
>
> Regression since: c619d20906d039060efbeaa822daf8e949f3ef24

New description:

 Summary of the bug:
 How to reproduce:
 {{{
 ./ffplay test25.nut
 use the mouse to scale it up a bit to better see
 and then repeatly press arrow left, each time on the right side a
 different
 mix of colors appears

 test25.nut is a mpeg4 yuv420p video with 25x25 size, infact codec and
 content seem not to matter

 ==1071990== Conditional jump or move depends on uninitialised value(s)
 ==1071990==    at 0x1324673: av_clip_uint8_c (common.h:208)
 ==1071990==    by 0x13260C3: yuv2plane1_8_c (output.c:426)
 ==1071990==    by 0x12FCC0D: lum_planar_vscale (vscale.c:53)
 ==1071990==    by 0x12F0E0A: swscale (swscale.c:498)
 ==1071990==    by 0x12F320A: scale_internal (swscale.c:1046)
 ==1071990==    by 0x12F239C: scale_cascaded (swscale.c:875)
 ==1071990==    by 0x12F27D4: scale_internal (swscale.c:937)
 ==1071990==    by 0x12F3BBD: ff_sws_slice_worker (swscale.c:1240)
 ==1071990==    by 0x13DC790: run_jobs (slicethread.c:65)
 ==1071990==    by 0x13DC866: thread_worker (slicethread.c:89)
 ==1071990==    by 0x694B608: start_thread (pthread_create.c:477)
 ==1071990==    by 0x6A85352: clone (clone.S:95)
 ==1071990==
 ==1071990== Thread 83:
 ==1071990== Conditional jump or move depends on uninitialised value(s)
 ==1071990==    at 0x1324673: av_clip_uint8_c (common.h:208)
 ==1071990==    by 0x132602D: yuv2planeX_8_c (output.c:416)
 ==1071990==    by 0x12FD038: chr_planar_vscale (vscale.c:100)
 ==1071990==    by 0x12F0E0A: swscale (swscale.c:498)
 ==1071990==    by 0x12F320A: scale_internal (swscale.c:1046)
 ==1071990==    by 0x12F239C: scale_cascaded (swscale.c:875)
 ==1071990==    by 0x12F27D4: scale_internal (swscale.c:937)
 ==1071990==    by 0x12F3BBD: ff_sws_slice_worker (swscale.c:1240)
 ==1071990==    by 0x13DC790: run_jobs (slicethread.c:65)
 ==1071990==    by 0x13DC866: thread_worker (slicethread.c:89)
 ==1071990==    by 0x694B608: start_thread (pthread_create.c:477)
 ==1071990==    by 0x6A85352: clone (clone.S:95)
 ==1071990==
 ==1071990== Conditional jump or move depends on uninitialised value(s)
 ==1071990==    at 0x1324673: av_clip_uint8_c (common.h:208)
 ==1071990==    by 0x132602D: yuv2planeX_8_c (output.c:416)
 ==1071990==    by 0x12FD09E: chr_planar_vscale (vscale.c:101)
 ==1071990==    by 0x12F0E0A: swscale (swscale.c:498)
 ==1071990==    by 0x12F320A: scale_internal (swscale.c:1046)
 ==1071990==    by 0x12F239C: scale_cascaded (swscale.c:875)
 ==1071990==    by 0x12F27D4: scale_internal (swscale.c:937)
 ==1071990==    by 0x12F3BBD: ff_sws_slice_worker (swscale.c:1240)
 ==1071990==    by 0x13DC790: run_jobs (slicethread.c:65)
 ==1071990==    by 0x13DC866: thread_worker (slicethread.c:89)
 ==1071990==    by 0x694B608: start_thread (pthread_create.c:477)
 ==1071990==    by 0x6A85352: clone (clone.S:95)

 }}}

 Regression since: c619d20906d039060efbeaa822daf8e949f3ef24

 also -vf scale,format=rgb24 seems to avoid the issue

--
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Ticket URL: <https://trac.ffmpeg.org/ticket/11265#comment:1>
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