[FFmpeg-user] Stream specifier ':a:0' in filtergraph description ... matches no streams

[Ulf Zibis]

Hi,

I want to cut out some seconds out of an MP3 stream. Unfortunately the following command according [https://trac.ffmpeg.org/wiki/Concatenate#filter] does not work.
Can someone explain my error?

)$ ffmpeg -t 43.721 -i "08 Andreas Vollenweider - Brothership.mp3" -ss 1:14.036 -i "08 Andreas Vollenweider - Brothership.mp3" -filter_complex "[0:a:0][1:a:0]concat=n=2:a=1[outa]" -map "[outa]" -q 2 "08 Andreas Vollenweider - Brothership_new.mp3"
ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers
   built with gcc 13 (Ubuntu 13.2.0-23ubuntu3)
   configuration: --prefix=/usr --extra-version=3ubuntu5 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcaca --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 --enable-libvpl --disable-libmfx --enable-libdc1394 
--enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libjack --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-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
   libavutil      58. 29.100 / 58. 29.100
   libavcodec     60. 31.102 / 60. 31.102
   libavformat    60. 16.100 / 60. 16.100
   libavdevice    60.  3.100 / 60.  3.100
   libavfilter     9. 12.100 /  9. 12.100
   libswscale      7.  5.100 /  7.  5.100
   libswresample   4. 12.100 /  4. 12.100
   libpostproc    57.  3.100 / 57.  3.100
[mp3 @ 0x61eebd182cc0] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from '08 Andreas Vollenweider - Brothership.mp3':
   Metadata:
     album_artist    : Andreas Vollenweider
     encoded_by      : dBpoweramp Release 13.5
     title           : Brothership
     artist          : Andreas Vollenweider
     album           : White Winds (Seeker's Journey)
     track           : 8
     iTunPGAP        : 0
     iTunNORM        :  00000035 00000056 0000051B 0000048A 000060D6 000060D6 000043A1 0000774A 00010BF5 0000C65E
     iTunSMPB        :  00000000 00000210 0000082B 00000000003C2A45 00000000 001B3D78 00000000 00000000 00000000 00000000 00000000 00000000
     date            : 1984
   Duration: 00:01:29.42, start: 0.000000, bitrate: 320 kb/s
   Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
[mp3 @ 0x61eebd1865c0] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from '08 Andreas Vollenweider - Brothership.mp3':
   Metadata:
     album_artist    : Andreas Vollenweider
     encoded_by      : dBpoweramp Release 13.5
     title           : Brothership
     artist          : Andreas Vollenweider
     album           : White Winds (Seeker's Journey)
     track           : 8
     iTunPGAP        : 0
     iTunNORM        :  00000035 00000056 0000051B 0000048A 000060D6 000060D6 000043A1 0000774A 00010BF5 0000C65E
     iTunSMPB        :  00000000 00000210 0000082B 00000000003C2A45 00000000 001B3D78 00000000 00000000 00000000 00000000 00000000 00000000
     date            : 1984
   Duration: 00:01:29.42, start: 0.000000, bitrate: 320 kb/s
   Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
[fc#0 @ 0x61eebd134e00] Stream specifier ':a:0' in filtergraph description [0:a:0][1:a:0]concat=n=2:a=1[outa] matches no streams.


-Ulf