[FFmpeg-user] Differences between ffmpeg and ffplay

[Paul B Mahol]

On 10/2/18, Michael Koch <astroelectronic at t-online.de> wrote:
> I'm still experimenting with the ultrasonic converter. Converting from
> one file to another file works without problems:
>
> C:\Users\mkoch\Desktop\Ultrasonic Live>c://ffmpeg/ffmpeg -i
> test_15kHz.mp3 -f la
> vfi -i aevalsrc="sin(12000*2*PI*t):c=stereo:s=44100" -filter_complex
> "[0]volume=
> 1,highpass=f=12000,highpass=f=12000,highpass=f=12000,highpass=f=12000[sound];[so
> und][1]amultiply,lowpass=f=10000,lowpass=f=10000,lowpass=f=10000,lowpass=f=10000
> " -y out.mp3
>
> (no console output, because this is working fine)
>
> As the next step, I want to hear the output live on the speakers. I did
> use exactly the same command line as above, but I replaced ffmpeg by
> ffplay and I omitted the output file. At the end of the console output
> is an error message. Can't ffplay handle two inputs? Why doesn't ffplay
> accept the command line that works fine with ffmpeg?

You should really, really use mpv, it supports multiple inputs, and
complex filtergraph (unlike ffplay)

mpv test.mp3 -lavfi-complex
"aevalsrc=sin(5000*2*PI*t):c=stereo:s=44100[sine],[aid1]highpass=f=5000,highpass=f=5000,highpass=f=5000,highpass=f=5000[sound],[sound][sine]amultiply,dynaudnorm=m=100,lowpass=f=1000,lowpass=f=10000,lowpass=f=10000,lowpass=f=10000,asplit[ao],showspectrum=scale=log:size=hd720:color=channel[vo]"

>
> C:\Users\mkoch\Desktop\Ultrasonic Live>c://ffmpeg/ffplay -i
> test_15kHz.mp3 -f la
> vfi -i aevalsrc="sin(12000*2*PI*t):c=stereo:s=44100" -filter_complex
> "[0]volume=
> 1,highpass=f=12000,highpass=f=12000,highpass=f=12000,highpass=f=12000[sound];[so
> und][1]amultiply,lowpass=f=10000,lowpass=f=10000,lowpass=f=10000,lowpass=f=10000
> "
> ffplay version N-92078-g179ed2d2e0 Copyright (c) 2003-2018 the FFmpeg
> developers
>
>    built with gcc 8.2.1 (GCC) 20180813
>    configuration: --enable-gpl --enable-version3 --enable-sdl2
> --enable-fontconfi
> g --enable-gnutls --enable-iconv --enable-libass --enable-libbluray
> --enable-lib
> freetype --enable-libmp3lame --enable-libopencore-amrnb
> --enable-libopencore-amr
> wb --enable-libopenjpeg --enable-libopus --enable-libshine
> --enable-libsnappy --
> enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx
> --enable-l
> ibwavpack --enable-libwebp --enable-libx264 --enable-libx265
> --enable-libxml2 --
> enable-libzimg --enable-lzma --enable-zlib --enable-gmp
> --enable-libvidstab --en
> able-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
> --enable-libspeex --en
> able-libxvid --enable-libaom --enable-libmfx --enable-amf
> --enable-ffnvcodec --e
> nable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec
> --enable-dxva2 --enab
> le-avisynth
>    libavutil      56. 19.101 / 56. 19.101
>    libavcodec     58. 31.101 / 58. 31.101
>    libavformat    58. 18.103 / 58. 18.103
>    libavdevice    58.  4.104 / 58.  4.104
>    libavfilter     7. 33.100 /  7. 33.100
>    libswscale      5.  2.100 /  5.  2.100
>    libswresample   3.  2.100 /  3.  2.100
>    libpostproc    55.  2.100 / 55.  2.100
> Argument 'aevalsrc=sin(12000*2*PI*t):c=stereo:s=44100' provided as input
> filenam
> e, but 'test_15kHz.mp3' was already specified.
>
> Michael
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