[FFmpeg-trac] #5630(undetermined:new): crop filter no longer outputs images of 1 pixel height

[FFmpeg]

#5630: crop filter no longer outputs images of 1 pixel height
-------------------------------------+-------------------------------------
               Reporter:  dericed    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  crop,
             Blocked By:             |  regression
Reproduced by developer:  0          |               Blocking:
                                     |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 Summary of the bug:

 Until recently, the crop filter could be used to output a 1 pixel high
 image (provided the input did not have chroma subsampling). To analyze
 individual lines of video I could use crop to output one pixel row to pass
 to other filters such as waveform. In git-master, the crop filter no
 longer outputs 1 pixel high images.

 How to reproduce:
 {{{
 ffplay -f lavfi -i testsrc -vf
 "format=yuv444p|yuva444p10be|rgb24,crop=w=iw:h=1:x=0:y=20"
 ffplay version git-2016-06-10-d4cd8e7 Copyright (c) 2003-2016 the FFmpeg
 developers
   built with Apple LLVM version 7.3.0 (clang-703.0.31)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared
 --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables
 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-
 opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-
 libfreetype --enable-ffplay --enable-vda
   libavutil      55. 24.100 / 55. 24.100
   libavcodec     57. 46.100 / 57. 46.100
   libavformat    57. 37.101 / 57. 37.101
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 46.101 /  6. 46.101
   libavresample   3.  0.  0 /  3.  0.  0
   libswscale      4.  1.100 /  4.  1.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, lavfi, from 'testsrc':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 [ffplay_crop @ 0x7fab0ae28560] Invalid too big or non positive size for
 width '320' or height '0'
 [ffplay_crop @ 0x7fab0ae28560] Failed to configure input pad on
 ffplay_crop
 }}}


 Although the requested height is '1', the filter reports on height as 0.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5630>
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