[FFmpeg-user] linear loudnorm
Paul B Mahol
onemda at gmail.com
Sun Feb 27 13:47:36 EET 2022
On Mon, Feb 22, 2021 at 6:52 PM Jonathan Baecker <jonbae77 at gmail.com> wrote:
> Hello!
>
> I'm trying to nomalize an audio file with FFmpeg. I'm using the loudnorm
> filter. The source loudness is -23 LUFS and I want to make it -17 LUFS.
> As far as I know, loudnorm has 2 modes of normalizing audio: linear and
> dynamic (analysing small parts vs. analysing the whole file).
>
> The problem is that when I have an audio file where someone is speaking,
> the pauses in the speech get louder and louder and thus a hissing noise
> is clearly audible. Thats why I need linear normalization. But for some
> reason, that I can't explain, FFmpeg always switches to dynamic mode.
>
> I've considered all the requirements for liner scaling in the loudnorm
> documentation, but I can't figure out whats wrong. I've specified all 4
> values, target LRA isn't lower than input LRA, and when I normalize the
> file in Adobe Audition to -17 LUFS, I can't see any peeking.
> What would be the best way to get linear normalization with FFmpeg?
>
Could provide input.wav somehow?
>
> Here is what I'm doing:
>
> 1. Analyze the source audio file:
>
> ffmpeg -i input.wav -filter:a
> loudnorm=I=-17:TP=-1:LRA=9:print_format=json -f null -
> ffmpeg version N-100942-gc596e82155-gb7251aed46+3 Copyright (c)
> 2000-2021 the FFmpeg developers
> built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
> configuration: --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache
> g++' --ld='ccache g++' --disable-autodetect --enable-amf --enable-bzlib
> --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2
> --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2
> --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame
> --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
> --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug
> --enable-fontconfig --enable-libass --enable-libbluray
> --enable-libfreetype --enable-libmfx --enable-libmysofa
> --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenjpeg --enable-libsnappy --enable-libsoxr
> --enable-libspeex --enable-libtheora --enable-libtwolame
> --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp
> --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl
> --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3
> --enable-chromaprint --enable-decklink --enable-frei0r --enable-libbs2b
> --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libflite
> --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc
> --enable-libsvthevc --enable-libsvtav1 --enable-libkvazaar
> --enable-libmodplug --enable-librtmp --enable-librubberband
> --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi
> --enable-openal --enable-libvmaf --enable-libcodec2 --enable-libsrt
> --enable-ladspa --enable-librav1e --enable-libglslang --enable-vulkan
> --enable-openssl --extra-cflags=-fopenmp --extra-libs=-lgomp
> --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++
> --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC
> --extra-cflags=-DCHROMAPRINT_NODLL --extra-libs=-lstdc++
> --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi
> --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
> --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree
> --extra-cflags=-DAL_LIBTYPE_STATIC
> --extra-cflags='-ID:/ab-suite/local64/include/AL'
> libavutil 56. 64.100 / 56. 64.100
> libavcodec 58.120.100 / 58.120.100
> libavformat 58. 65.101 / 58. 65.101
> libavdevice 58. 11.103 / 58. 11.103
> libavfilter 7.101.100 / 7.101.100
> libswscale 5. 8.100 / 5. 8.100
> libswresample 3. 8.100 / 3. 8.100
> libpostproc 55. 8.100 / 55. 8.100
> Guessed Channel Layout for Input Stream #0.0 : stereo
> Input #0, wav, from 'input.wav':
> Metadata:
> encoded_by : Adobe Adobe Media Encoder 2020.0
> encoder : Adobe Adobe Media Encoder 2020.0 (Windows)
> date : 2021-02-15
> creation_time : 15:31:34
> time_reference : 0
> Duration: 00:37:57.52, bitrate: 1539 kb/s
> Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
> stereo, s16, 1536 kb/s
> Stream mapping:
> Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
> Press [q] to stop, [?] for help
> Output #0, null, to 'pipe:':
> Metadata:
> encoded_by : Adobe Adobe Media Encoder 2020.0
> time_reference : 0
> date : 2021-02-15
> encoder : Lavf58.65.101
> Stream #0:0: Audio: pcm_s16le, 192000 Hz, stereo, s16, 6144 kb/s
> Metadata:
> encoder : Lavc58.120.100 pcm_s16le
> size=N/A time=00:37:54.62 bitrate=N/A speed=33.9x
> video:0kB audio:1708140kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: unknown
> [Parsed_loudnorm_0 @ 00000121fcf41e00]
> {
> "input_i" : "-22.72",
> "input_tp" : "-2.67",
> "input_lra" : "6.10",
> "input_thresh" : "-33.31",
> "output_i" : "-16.95",
> "output_tp" : "-1.00",
> "output_lra" : "6.00",
> "output_thresh" : "-27.53",
> "normalization_type" : "dynamic",
> "target_offset" : "-0.05"
> }
>
> 2. Encode the audio with:
>
> ffmpeg -i input.wav -filter:a
> loudnorm=I=-17:TP=-1:LRA=9:measured_I=-22.72:measured_TP=-2.67:measured_LRA=6.10:measured_thresh=-33.31:offset=-0.05:linear=true:print_format=summary
>
> output.wav
> ffmpeg version N-100942-gc596e82155-gb7251aed46+3 Copyright (c)
> 2000-2021 the FFmpeg developers
> built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
> configuration: --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache
> g++' --ld='ccache g++' --disable-autodetect --enable-amf --enable-bzlib
> --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2
> --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2
> --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame
> --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
> --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug
> --enable-fontconfig --enable-libass --enable-libbluray
> --enable-libfreetype --enable-libmfx --enable-libmysofa
> --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenjpeg --enable-libsnappy --enable-libsoxr
> --enable-libspeex --enable-libtheora --enable-libtwolame
> --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp
> --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl
> --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3
> --enable-chromaprint --enable-decklink --enable-frei0r --enable-libbs2b
> --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libflite
> --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc
> --enable-libsvthevc --enable-libsvtav1 --enable-libkvazaar
> --enable-libmodplug --enable-librtmp --enable-librubberband
> --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi
> --enable-openal --enable-libvmaf --enable-libcodec2 --enable-libsrt
> --enable-ladspa --enable-librav1e --enable-libglslang --enable-vulkan
> --enable-openssl --extra-cflags=-fopenmp --extra-libs=-lgomp
> --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++
> --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC
> --extra-cflags=-DCHROMAPRINT_NODLL --extra-libs=-lstdc++
> --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi
> --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
> --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree
> --extra-cflags=-DAL_LIBTYPE_STATIC
> --extra-cflags='-ID:/ab-suite/local64/include/AL'
> libavutil 56. 64.100 / 56. 64.100
> libavcodec 58.120.100 / 58.120.100
> libavformat 58. 65.101 / 58. 65.101
> libavdevice 58. 11.103 / 58. 11.103
> libavfilter 7.101.100 / 7.101.100
> libswscale 5. 8.100 / 5. 8.100
> libswresample 3. 8.100 / 3. 8.100
> libpostproc 55. 8.100 / 55. 8.100
> Guessed Channel Layout for Input Stream #0.0 : stereo
> Input #0, wav, from 'input.wav':
> Metadata:
> encoded_by : Adobe Adobe Media Encoder 2020.0
> encoder : Adobe Adobe Media Encoder 2020.0 (Windows)
> date : 2021-02-15
> creation_time : 15:31:34
> time_reference : 0
> Duration: 00:37:57.52, bitrate: 1539 kb/s
> Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
> stereo, s16, 1536 kb/s
> File 'output.wav' already exists. Overwrite? [y/N] y
> Stream mapping:
> Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
> Press [q] to stop, [?] for help
> Output #0, wav, to 'output.wav':
> Metadata:
> ITCH : Adobe Adobe Media Encoder 2020.0
> time_reference : 0
> ICRD : 2021-02-15
> ISFT : Lavf58.65.101
> Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 192000 Hz,
> stereo, s16, 6144 kb/s
> Metadata:
> encoder : Lavc58.120.100 pcm_s16le
> size= 1708140kB time=00:37:54.62 bitrate=6151.8kbits/s speed=33.6x
> video:0kB audio:1708140kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 0.000009%
> [Parsed_loudnorm_0 @ 000001a3673c0780]
> Input Integrated: -22.7 LUFS
> Input True Peak: -2.7 dBTP
> Input LRA: 6.1 LU
> Input Threshold: -33.3 LUFS
>
> Output Integrated: -17.0 LUFS
> Output True Peak: -1.0 dBTP
> Output LRA: 6.0 LU
> Output Threshold: -27.6 LUFS
>
> Normalization Type: Dynamic
> Target Offset: -0.0 LU
>
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