[FFmpeg-user] Error in aeval?

[Paul B Mahol]

On 10/29/22, Michael Koch <astroelectronic at t-online.de> wrote:
> This command line works as expected:
>
> ffmpeg -f lavfi -i sine,aeval="val(0)|val(0)*sin(2)*sin(2)" -ac 2 -t 5
> -y out.wav
>
>
> Why does it no longer work when I replace sin(2)*sin(2)  by pow(sin(2),2)  ?
>
> ffmpeg -f lavfi -i sine,aeval="val(0)|val(0)*pow(sin(2),2)" -ac 2 -t 5
> -y out.wav
>
> Is this a bug? The console output is below.

PEBKAC

Escape ','

>
> Michael
>
>
> C:\Users\astro\Desktop\Mosquito>ffmpeg -f lavfi -i
> sine,aeval="val(0)|val(0)*pow(sin(2),2)" -ac 2 -t 5 -y out.wav
> ffmpeg version 2022-10-24-git-d79c240196-full_build-www.gyan.dev
> Copyright (c) 2000-2022 the FFmpeg developers
>    built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
>    configuration: --enable-gpl --enable-version3 --enable-static
> --disable-w32threads --disable-autodetect --enable-fontconfig
> --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp
> --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib
> --enable-librist --enable-libsrt --enable-libssh --enable-libzmq
> --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2
> --enable-libaribb24 --enable-libdav1d --enable-libdavs2
> --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1
> --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2
> --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg
> --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r
> --enable-libfreetype --enable-libfribidi --enable-liblensfun
> --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf
> --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec
> --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl
> --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl
> --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt
> --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine
> --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc
> --enable-libilbc --enable-libgsm --enable-libopencore-amrnb
> --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa
> --enable-libbs2b --enable-libflite --enable-libmysofa
> --enable-librubberband --enable-libsoxr --enable-chromaprint
>    libavutil      57. 39.101 / 57. 39.101
>    libavcodec     59. 51.100 / 59. 51.100
>    libavformat    59. 34.101 / 59. 34.101
>    libavdevice    59.  8.101 / 59.  8.101
>    libavfilter     8. 49.101 /  8. 49.101
>    libswscale      6.  8.112 /  6.  8.112
>    libswresample   4.  9.100 /  4.  9.100
>    libpostproc    56.  7.100 / 56.  7.100
> [Parsed_aeval_1 @ 000002d8c2939000] [Eval @ 000000f7499fe440] Missing
> ')' or too many args in 'pow(sin(2)'
> [lavfi @ 000002d8c29261c0] Error initializing filter 'aeval' with args
> 'val(0)|val(0)*pow(sin(2)'
> sine,aeval=val(0)|val(0)*pow(sin(2),2): Invalid argument
>
>
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