#11323: soxr resampler assertion failure with precision>=30 and specific
duration
values
----------------------------------+--------------------------------------
Reporter: realies | Type: defect
Status: new | Priority: normal
Component: avfilter | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
----------------------------------+--------------------------------------
Summary of the bug:
FFmpeg crashes with "Assertion best_input >= 0 failed" when using soxr
resampler with precision>=30 and duration values with 3 or more decimal
places.
How to reproduce:
{{{
# Minimal failing case:
ffmpeg -filter_complex
"sine=frequency=440:duration=65.706,aresample=44100:resampler=soxr:precision=33"
output.wav
# Error message:
Assertion best_input >= 0 failed at fftools/ffmpeg_filter.c:2127
# Working variations:
1. Same command with 2 decimal places works:
ffmpeg -filter_complex
"sine=frequency=440:duration=65.70,aresample=44100:resampler=soxr:precision=33"
output.wav
2. Same command with default resampler works:
ffmpeg -filter_complex
"sine=frequency=440:duration=65.706,aresample=44100:precision=33"
output.wav
3. Same command with lower precision works:
ffmpeg -filter_complex
"sine=frequency=440:duration=65.706,aresample=44100:resampler=soxr:precision=29"
output.wav
ffmpeg version N-117857-g2d077f9acd-20241121 Copyright (c) 2000-2024 the
FFmpeg developers
built with gcc 14.1.0 (crosstool-NG 1.26.0.93_a87bf7f)
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-
config=pkg-config --cross-prefix=x86_64-ffbuild-linux-gnu- --arch=x86_64
--target-os=linux --enable-gpl --enable-version3 --disable-debug --enable-
iconv --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp
--enable-libxml2 --enable-openssl --enable-lzma --enable-fontconfig
--enable-libharfbuzz --enable-libvorbis --enable-opencl --enable-libpulse
--enable-libvmaf --enable-libxcb --enable-xlib --enable-amf --enable-
libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint
--enable-libdav1d --enable-libdavs2 --enable-libdvdread --enable-libdvdnav
--disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r
--enable-libgme --enable-libkvazaar --enable-libaribcaption --enable-
libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-
libopus --enable-librist --enable-libssh --enable-libtheora --enable-
libvpx --enable-libwebp --enable-lv2 --enable-libvpl --enable-openal
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264
--enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-
librubberband --disable-schannel --enable-sdl2 --enable-libsoxr --enable-
libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --enable-
libdrm --enable-vaapi --enable-libvidstab --enable-vulkan --enable-
libshaderc --enable-libplacebo --enable-libvvenc --enable-libx264
--enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg
--enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags=
--extra-libs='-ldl -lgomp' --extra-ldflags=-pthread --extra-
ldexeflags=-pie --cc=x86_64-ffbuild-linux-gnu-gcc --cxx=x86_64-ffbuild-
linux-gnu-g++ --ar=x86_64-ffbuild-linux-gnu-gcc-ar --ranlib=x86_64
-ffbuild-linux-gnu-gcc-ranlib --nm=x86_64-ffbuild-linux-gnu-gcc-nm
--extra-version=20241121
libavutil 59. 47.100 / 59. 47.100
libavcodec 61. 25.102 / 61. 25.102
libavformat 61. 9.100 / 61. 9.100
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 6.101 / 10. 6.101
libswscale 8. 9.101 / 8. 9.101
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
}}}
Additional notes:
- Issue occurs with precision values of 30-33
- Issue only manifests with soxr resampler (default swresample works fine)
- Duration values with 3+ decimal places trigger the failure
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11323>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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