Bug#1140564: ffmpeg: filter-mcdeint-slow-edge fails on loong64

Source: ffmpeg
Version: 7:8.1.2-1
Severity: important
Tags: ftbfs
X-Debbugs-Cc: [email protected], [email protected]
User: [email protected]
Usertags: loong64
Control: forwarded -1 https://code.ffmpeg.org/FFmpeg/FFmpeg/issues/23558

Dear loong64 porters,

the test filter-mcdeint-slow-edge fails on loong64:

--- /build/reproducible-path/ffmpeg-8.1.2/tests/ref/fate/filter-mcdeint-slow-edge	2026-06-17 02:17:59.000000000 +0000
+++ tests/data/fate/filter-mcdeint-slow-edge	2026-06-22 16:22:14.869190391 +0000
@@ -1,8 +0,0 @@
-#tb 0: 1/25
-#media_type 0: video
-#codec_id 0: rawvideo
-#dimensions 0: 5x32
-#sar 0: 1/1
-0,          0,          0,        1,      480, 0xe8a1f302
-0,          1,          1,        1,      480, 0x0789f31c
-0,          2,          2,        1,      480, 0x113af329
/build/reproducible-path/ffmpeg-8.1.2/tests/fate-run.sh fate-filter-lavd-testsrc "" "" "/build/reproducible-path/ffmpeg-8.1.2/debian/standard" 'framecrc -f lavfi -i testsrc=r=7:n=2:d=10' '' '' '' '1' '' '' '' '' '' '' '' '' '' ''
TEST    filter-testsrc2-yuv420p
/build/reproducible-path/ffmpeg-8.1.2/tests/fate-run.sh fate-filter-testsrc2-yuv420p "" "" "/build/reproducible-path/ffmpeg-8.1.2/debian/standard" 'framecrc -lavfi testsrc2=r=7:d=10 -pix_fmt yuv420p' '' '' '' '1' '' '' '' '' '' '' '' '' '' ''
Test filter-mcdeint-slow-edge failed. Look at tests/data/fate/filter-mcdeint-slow-edge.err for details.
ffmpeg version 8.1.2-1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 15 (Debian 15.3.0-1)
  configuration: --prefix=/usr --extra-version=1 --toolchain=hardened --libdir=/usr/lib/loongarch64-linux-gnu --incdir=/usr/include/loongarch64-linux-gnu --arch=loong64 --enable-gpl --disable-stripping --disable-pocketsphinx --disable-libcaca --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --disable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libjxl --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-librsvg --enable-shared
  libavutil      60. 26.102 / 60. 26.102
  libavcodec     62. 28.102 / 62. 28.102
  libavformat    62. 12.102 / 62. 12.102
  libavdevice    62.  3.102 / 62.  3.102
  libavfilter    11. 14.102 / 11. 14.102
  libswscale      9.  5.102 /  9.  5.102
  libswresample   6.  3.102 /  6.  3.102
Stream mapping:
  mcdeint:default -> Stream #0:0 (rawvideo)
corrupted size vs. prev_size
Aborted
threads=1

See the build log at
https://buildd.debian.org/status/fetch.php?pkg=ffmpeg&arch=loong64&ver=7%3A8.1.2-1&stamp=1782145689&raw=0.

I have reported the issue upstream, but help would be appreciated to
debug and fix this issue.

Cheers
-- 
Sebastian Ramacher