Anyway, in the chain where you have the combined result, add ',scale640:-1'. What's more, what we (I) suggested to you may have been sufficiently simple to justify '-vf' instead of '-filtercomplex'. Give up and follow what ffmpeg says.This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead. FossiesDox: ffmpeg-5.1.tar.xz ('unofficial' and yet experimental doxygen-generated source code documentation) Here is a list of all functions, variables, defines, enums, and typedefs with links to the files they belong to: - n - N : vfpp7.c, afmcompand.c N0 : vfpp7.c N1 : vfpp7.c N2 : vfpp7.c NBSSIZES : vp9shared.h ncoefhf : vfw3fdif. In fact, '-vf' ('-af') are simplifications of a complex filter restricted to a single chain. In libavfilter, a filter can have multiple inputs and multiple outputs. FILTERINGINTRODUCTION Filtering in FFmpeg is enabled through the libavfilter library.
However, there are so many unfair restrictions in ffmpeg, which is just one of them. ffmpeg-filters - FFmpeg filters DESCRIPTION This document describes filters, sources, and sinks provided by the libavfilter library. I don’t think it’s technically impossible. “I can’t specify the channel layout unless you tell me” is very strange.
Failed to open file 'wolframtones_03.wav' or configure filtergraph Unknown channel layouts not supported, try specifying a channel layout using 'aformat=channel_layouts=something'.
5.100 nan : 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0 Input #0, wav, from 'wolframtones_03.wav': Duration: 00:00:30.19, bitrate: 1411 kb/s Stream #0:0: Audio: pcm_s16le ( / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s Cannot select channel layout for the link between filters auto_resampler_0 and Parsed_asetrate_0. ~]$ ffplay wolframtones_03.wav -af 'asetrate=44100*3/4' ffplay version 3.3.2 Copyright (c) 2003-2017 the FFmpeg developers built with gcc 7.1.0 (GCC) configuration: -disable-static -enable-shared -enable-gpl -enable-version3 -enable-cuda -enable-cuvid -enable-d3d11va -enable-dxva2 -enable-libmfx -enable-nvenc -enable-avisynth -enable-bzlib -enable-fontconfig -enable-frei0r -enable-gnutls -enable-iconv -enable-libass -enable-libbluray -enable-libbs2b -enable-libcaca -enable-libfreetype -enable-libgme -enable-libgsm -enable-libilbc -enable-libmodplug -enable-libmp3lame -enable-libopencore-amrnb -enable-libopencore-amrwb -enable-libopenh264 -enable-libopenjpeg -enable-libopus -enable-librtmp -enable-libsnappy -enable-libsoxr -enable-libspeex -enable-libtheora -enable-libtwolame -enable-libvidstab -enable-libvo-amrwbenc -enable-libvorbis -enable-libvpx -enable-libwavpack -enable-libwebp -enable-libx264 -enable-libx265 -enable-libxavs -enable-libxvid -enable-libzimg -enable-lzma -enable-zlib libavutil 55.
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