[FFmpeg-user] feedback filter

[Paul B Mahol]

On Mon, Apr 18, 2022 at 8:00 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Hello,
>
> I'm just testing the new feedback filter with this command line:
>
> ffmpeg -i test.jpg -vf
> "[in][fb_in]feedback=x=2000:y=1000:w=2000:h=2000[out][fb_out];[fb_out]gblur=50[fb_in]"
>
> -map "[out]" -y out.jpg
>
> I get this error message:
> Output with label 'out' does not exist in any defined filter graph, or
> was already used elsewhere.
>
> When I remove -map "[out]"  then it works. But I don't understand why I
> can't map [out] to the output. The console output is below.
>
>
Use null filter as last filter for now, no need to use -map in this case.


> Michael
>
>
>
> C:\Users\astro\Desktop\test>ffmpeg -i test.jpg -vf
> "[in][fb_in]feedback=x=2000:y=1000:w=2000:h=2000[out][fb_out];[fb_out]gblur=50[fb_in]"
>
> -map "[out]" -y out.jpg
> ffmpeg version 2022-04-18-git-d5687236ab-full_build-www.gyan.dev
> Copyright (c) 2000-2022 the FFmpeg developers
>    built with gcc 11.2.0 (Rev10, 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-libsnappy --enable-zlib
> --enable-librist --enable-libsrt --enable-libssh --enable-libzmq
> --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2
> --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi
> --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264
> --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom
> --enable-libopenjpeg --enable-libvpx --enable-mediafoundation
> --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi
> --enable-liblensfun --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-libshaderc --enable-vulkan
> --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme
> --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb
> --enable-libmp3lame --enable-libshine --enable-libtheora
> --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc
> --enable-libgsm --enable-libopencore-amrnb --enable-libopus
> --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b
> --enable-libflite --enable-libmysofa --enable-librubberband
> --enable-libsoxr --enable-chromaprint
>    libavutil      57. 24.101 / 57. 24.101
>    libavcodec     59. 26.100 / 59. 26.100
>    libavformat    59. 22.100 / 59. 22.100
>    libavdevice    59.  6.100 / 59.  6.100
>    libavfilter     8. 33.100 /  8. 33.100
>    libswscale      6.  6.100 /  6.  6.100
>    libswresample   4.  6.100 /  4.  6.100
>    libpostproc    56.  5.100 / 56.  5.100
> Input #0, image2, from 'test.jpg':
>    Duration: 00:00:00.04, start: 0.000000, bitrate: 743360 kb/s
>    Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc,
> bt470bg/unknown/unknown), 6720x4480 [SAR 1:1 DAR 3:2], 25 fps, 25 tbr,
> 25 tbn
> Output with label 'out' does not exist in any defined filter graph, or
> was already used elsewhere.
>
>
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