rending bug for 1080*1920 resolution video

When I use gl-transition for video which ratios is 9:16 (such as 1080x1920, 720x1280, 540x960)，glsl filter rending bug，same like issues #7

ffmpeg command:

./ffmpeg \
  -i media/a1.mp4 \
  -i media/a2.mp4 \
  -filter_complex " \
    [0:v]split[v000][v010]; \
    [1:v]split[v100][v110]; \
    [v000]trim=0:2[v001]; \
    [v010]trim=2:3[v011t]; \
    [v011t]setpts=PTS-STARTPTS[v011]; \
    [v100]trim=0:3[v101]; \
    [v110]trim=3:4[v111t]; \
    [v111t]setpts=PTS-STARTPTS[v111]; \
    [v011][v101]gltransition=duration=1:source=./swap.glsl[vt0]; \
    [v001][vt0][v111]concat=n=3[outv]" \
  -map "[outv]" \
  -c:v libx264 -profile:v baseline -preset slow -movflags faststart -pix_fmt yuv420p \
  -y media/out_1.mp4

video info:

➜  ~ ffmpeg -i a1.mp4
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-ffplay --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  libavutil      56. 14.100 / 56. 14.100
  libavcodec     58. 18.100 / 58. 18.100
  libavformat    58. 12.100 / 58. 12.100
  libavdevice    58.  3.100 / 58.  3.100
  libavfilter     7. 16.100 /  7. 16.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  1.100 /  5.  1.100
  libswresample   3.  1.100 /  3.  1.100
  libpostproc    55.  1.100 / 55.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/yehot/Desktop/mgc-ffmpeg-source/media/a1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2018-09-21T11:17:21.000000Z
  Duration: 00:00:23.40, start: 0.000000, bitrate: 8414 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1080x1920, 8095 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2018-09-21T11:17:21.000000Z
      handler_name    : Alias Data Handler
      encoder         : AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2018-09-21T11:17:21.000000Z
      handler_name    : Alias Data Handler

transitive-bullshit / ffmpeg-gl-transition

rending bug for 1080*1920 resolution video #28