Re: [FFmpeg-user] concat audio files
On Sat, Jun 11, 2022 at 12:02 PM Michael Koch wrote: > Am 11.06.2022 um 11:46 schrieb Nicolas George: > > Michael Koch (12022-06-11): > >> I always get this error message: > >> Stream specifier '' in filtergraph description [0][1]concat=n=2:a=1 > matches > >> no streams. > > Where did you find this "[number]" syntax, and has it ever worked for > > you? > > yes, it works after I added v=0. Isn't this the normal syntax to specify > the two inputs of the concat filter? In this case [0][1] could be > omitted because there are only these two inputs. [0:0][1:0] does also work. > > You should really use lavfi-preview, its GUI for libavfilter. > Michael > > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] concat audio files
Am 11.06.2022 um 11:46 schrieb Nicolas George: Michael Koch (12022-06-11): I always get this error message: Stream specifier '' in filtergraph description [0][1]concat=n=2:a=1 matches no streams. Where did you find this "[number]" syntax, and has it ever worked for you? yes, it works after I added v=0. Isn't this the normal syntax to specify the two inputs of the concat filter? In this case [0][1] could be omitted because there are only these two inputs. [0:0][1:0] does also work. Michael ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] concat audio files
Am 11.06.2022 um 11:45 schrieb Gyan Doshi: On 2022-06-11 03:02 pm, Michael Koch wrote: 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 Default value for concat v is 1. So you need to set it to 0. concat=n=2:a=1:v=0 oh yes, that's it. Thank you! Michael ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] concat audio files
Michael Koch (12022-06-11): > I always get this error message: > Stream specifier '' in filtergraph description [0][1]concat=n=2:a=1 matches > no streams. Where did you find this "[number]" syntax, and has it ever worked for you? Regards, -- Nicolas George signature.asc Description: PGP signature ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] concat audio files
On 2022-06-11 03:02 pm, Michael Koch wrote: 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 Default value for concat v is 1. So you need to set it to 0. concat=n=2:a=1:v=0 Regards, Gyan ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] concat audio files
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. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
