Divide by zero in libavcodec/dovi_rpuenc.c:251

[Levon Gevorgyan]

Summary of the bug:
How to reproduce:

% ffmpeg -i "fail.mkv" -y -pix_fmt yuv420p10le \
    -c:V libsvtav1 -dolbyvision 1 "av1_fail.mkv"

libsvtav1 Cmake flags
-DCMAKE_BUILD_TYPE=Release -DSVT_AV1_LTO=ON \
          -DENABLE_AVX512=ON -DBUILD_TESTING=OFF \
          -DCOVERAGE=OFF \
          -DCMAKE_C_FLAGS="-O3 -march=native" \
          -DCMAKE_CXX_FLAGS="-O3 -march=native"

ffmpeg configure flags
ffmpeg version git-2024-04-29-08781eb
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --enable-libsvtav1 --enable-librav1e \
    --enable-libaom --enable-libvmaf --enable-libdav1d \
    --enable-libopus --arch=x86_64 --cpu=native --enable-lto \
    --extra-cflags='-O3 -march=native' --extra-cxxflags='-O3 -march=native' \
    --disable-doc --disable-htmlpages --disable-podpages --disable-txtpages

This results in a crash of ffmpeg due to divide by zero.

[Levon Gevorgyan]

gdb log

[Levon Gevorgyan]

valgrind log

[Levon Gevorgyan]

verbose ffmpeg log

[Balling]

What does this have to do with dolby_e?

[Levon Gevorgyan]

Replying to Balling:

What does this have to do with dolby_e?

On second look, I think it does not, so I modified my (first) ticket. I just searched for "dolby" in the keyword section and "dolby_e" was an autosuggest, apologies.

[Niklas Haas]

Should be fixed by 1d89de03d6a9273b5d552a02d50f8f23b6c84f9d

[Levon Gevorgyan]

Replying to Niklas Haas:

Should be fixed by 1d89de03d6a9273b5d552a02d50f8f23b6c84f9d

I can confirm latest ffmpeg build does not crash like before, so the fix must be working. Thanks!