[FFmpeg-trac] #11442(undetermined:new): Scale followed by vstack stopped working

[FFmpeg]

#11442: Scale followed by vstack stopped working
-------------------------------------+-------------------------------------
             Reporter:  Marth64      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 Since e61b9d4094d76f5fede0b65139d17add281e6e45 fftools/ffmpeg: propagate
 decoded_side_data from decoded streams to the filterchain

 How to reproduce:
 {{{
 ffmpeg -i tst.png -i tst.png -filter_complex
 "[0:v:0]scale=720:480[front];[1:v:0]scale=720:480[back];[front][back]vstack=2"
 -f null -
 }}}

 Result
 {{{
 ffmpeg version N-118362-ge61b9d4094 Copyright (c) 2000-2025 the FFmpeg
 developers
   built with Apple clang version 16.0.0 (clang-1600.0.26.6)
   configuration: --enable-debug=3 --enable-nonfree --enable-gpl --enable-
 demuxer=dvdvideo --enable-libdvdread --enable-libdvdnav --samples=fate-
 suite/
   libavutil      59. 55.100 / 59. 55.100
   libavcodec     61. 31.101 / 61. 31.101
   libavformat    61.  9.106 / 61.  9.106
   libavdevice    61.  4.100 / 61.  4.100
   libavfilter    10.  9.100 / 10.  9.100
   libswscale      8. 13.100 /  8. 13.100
   libswresample   5.  4.100 /  5.  4.100
   libpostproc    58.  4.100 / 58.  4.100
 Input #0, png_pipe, from 'tst.png':
   Duration: N/A, bitrate: N/A
   Stream #0:0: Video: png, rgba(pc, gbr/unknown/unknown), 720x480 [SAR
 971:894 DAR 971:596], 25 fps, 25 tbr, 25 tbn
 Input #1, png_pipe, from 'tst.png':
   Duration: N/A, bitrate: N/A
   Stream #1:0: Video: png, rgba(pc, gbr/unknown/unknown), 720x480 [SAR
 971:894 DAR 971:596], 25 fps, 25 tbr, 25 tbn
 Stream mapping:
   Stream #0:0 (png) -> scale:default
   Stream #1:0 (png) -> scale:default
   vstack:default -> Stream #0:0 (wrapped_avframe)
 Press [q] to stop, [?] for help
 [Parsed_vstack_2 @ 0x600002628180] Input 1 width 0 does not match input 0
 width 720.
 [Parsed_vstack_2 @ 0x600002628180] Failed to configure output pad on
 Parsed_vstack_2
 [fc#0 @ 0x600002228000] Error reinitializing filters!
 [fc#0 @ 0x600002228000] Task finished with error code: -22 (Invalid
 argument)
 [fc#0 @ 0x600002228000] Terminating thread with return code -22 (Invalid
 argument)
 [vost#0:0/wrapped_avframe @ 0x15b7086f0] [enc:wrapped_avframe @
 0x6000038285b0] Could not open encoder before EOF
 [vost#0:0/wrapped_avframe @ 0x15b7086f0] Task finished with error code:
 -22 (Invalid argument)
 [vost#0:0/wrapped_avframe @ 0x15b7086f0] Terminating thread with return
 code -22 (Invalid argument)
 [out#0/null @ 0x600002624240] Nothing was written into output file,
 because at least one of its streams received no packets.
 frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A
 Conversion failed!
 }}}

 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11442>
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