I want to concat two audio files. What's wrong with this command line?
ffmpeg -i birds1.wav -i birds1.wav -lavfi [0][1]concat=n=2:a=1 -c:a aac
-y sound.mp4
I always get this error message:
Stream specifier '' in filtergraph description [0][1]concat=n=2:a=1
matches no streams.
The console output is below.
Michael
D:\Bochum\audio>ffmpeg -i birds1.wav -i birds1.wav -lavfi
[0][1]concat=n=2:a=1 -c:a aac -y sound.mp4
ffmpeg version 2022-06-06-git-73302aa193-essentials_build-www.gyan.dev
Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 11.3.0 (Rev1, 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-zlib --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid
--enable-libaom --enable-libopenjpeg --enable-libvpx
--enable-mediafoundation --enable-libass --enable-libfreetype
--enable-libfribidi --enable-libvidstab --enable-libvmaf
--enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid
--enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va
--enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt
--enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora
--enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb
--enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
libavutil 57. 26.100 / 57. 26.100
libavcodec 59. 33.100 / 59. 33.100
libavformat 59. 24.100 / 59. 24.100
libavdevice 59. 6.100 / 59. 6.100
libavfilter 8. 40.100 / 8. 40.100
libswscale 6. 6.100 / 6. 6.100
libswresample 4. 6.100 / 4. 6.100
libpostproc 56. 5.100 / 56. 5.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'birds1.wav':
Duration: 00:02:01.97, bitrate: 2116 kb/s
Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s32 (24 bit), 2116 kb/s
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, wav, from 'birds1.wav':
Duration: 00:02:01.97, bitrate: 2116 kb/s
Stream #1:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s32 (24 bit), 2116 kb/s
Stream specifier '' in filtergraph description [0][1]concat=n=2:a=1
matches no streams.
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