使用 ffmpeg 生成白噪聲/粉噪聲/棕噪聲/藍噪聲等
# 使用 ffmpeg 生成白噪聲/粉噪聲/棕噪聲/藍噪聲/紫噪聲/絲絨噪聲 使用的 ffmpeg 版本: ``` > ffmpeg -version ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers built with gcc 12.2.0 (GCC) configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan libavutil???57. 28.100 / 57. 28.100 libavcodec???59. 37.100 / 59. 37.100 libavformat??59. 27.100 / 59. 27.100 libavdevice??59.?7.100 / 59.?7.100 libavfilter???8. 44.100 /?8. 44.100 libswscale???6.?7.100 /?6.?7.100 libswresample??4.?7.100 /?4.?7.100 libpostproc??56.?6.100 / 56.?6.100 ```
## 生成命令
+ **白噪聲**
?```
?ffmpeg -f lavfi -i anoisesrc=c=0 -t 2s 0.wav
?```
?示例:
?```
?> ffmpeg -f lavfi -i anoisesrc=c=0 -t 2s 0.wav
?ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
??built with gcc 12.2.0 (GCC)
??configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
??libavutil???57. 28.100 / 57. 28.100
??libavcodec???59. 37.100 / 59. 37.100
??libavformat??59. 27.100 / 59. 27.100
??libavdevice??59.?7.100 / 59.?7.100
??libavfilter???8. 44.100 /?8. 44.100
??libswscale???6.?7.100 /?6.?7.100
??libswresample??4.?7.100 /?4.?7.100
??libpostproc??56.?6.100 / 56.?6.100
?Input #0, lavfi, from 'anoisesrc=c=0':
??Duration: N/A, start: 0.000000, bitrate: 3072 kb/s
??Stream #0:0: Audio: pcm_f64le, 48000 Hz, mono, dbl, 3072 kb/s
?Stream mapping:
??Stream #0:0 -> #0:0 (pcm_f64le (native) -> pcm_s16le (native))
?Press [q] to stop, [?] for help
?Output #0, wav, to '0.wav':
??Metadata:
???ISFT??????: Lavf59.27.100
??Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s16, 768 kb/s
???Metadata:
????encoder?????: Lavc59.37.100 pcm_s16le
?size=???188kB time=00:00:02.00 bitrate= 768.3kbits/s speed= 649x??
?video:0kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.040625%
?```
+ **粉噪聲**
?```
?ffmpeg -f lavfi -i anoisesrc=c=1 -t 2s 1.wav
?```
+ **棕噪聲**
?```
?ffmpeg -f lavfi -i anoisesrc=c=2 -t 2s 2.wav
?```
+ **藍噪聲**
?```
?ffmpeg -f lavfi -i anoisesrc=c=3 -t 2s 3.wav
?```
+ **紫噪聲**
?```
?ffmpeg -f lavfi -i anoisesrc=c=4 -t 2s 4.wav
?```
+ **絲絨噪聲**
?```
?ffmpeg -f lavfi -i anoisesrc=c=5 -t 2s 5.wav
?```
## 命令參數(shù)解釋
`ffmpeg -f lavfi -i anoisesrc=c=0 -t 2s 0.wav`
+ `ffmpeg`
?運行 ffmpeg 程序.
+ `-f lavfi`
?使用 libavfilter.
?這個參數(shù)是為了使用后面的 `-i anoisesrc`.
+ `-i anoisesrc=c=0`
?使用 `anoisesrc` 生成噪聲, 其中 `c=0` 表示噪聲類型, `0` 是白噪聲.
?修改這個參數(shù)還可以生成粉噪聲, 棕噪聲等.
+ `-t 2s`
?時長, 此處是 2 秒.
+ `0.wav`
?輸出文件名, `wav` 后綴表示使用無壓縮的聲音文件格式.
?ffmpeg 會自動根據(jù)文件名后綴選擇相應的文件格式.
## 幫助信息
```
> ffmpeg -h filter=anoisesrc
ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
?built with gcc 12.2.0 (GCC)
?configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
?libavutil???57. 28.100 / 57. 28.100
?libavcodec???59. 37.100 / 59. 37.100
?libavformat??59. 27.100 / 59. 27.100
?libavdevice??59.?7.100 / 59.?7.100
?libavfilter???8. 44.100 /?8. 44.100
?libswscale???6.?7.100 /?6.?7.100
?libswresample??4.?7.100 /?4.?7.100
?libpostproc??56.?6.100 / 56.?6.100
Filter anoisesrc
?Generate a noise audio signal.
??Inputs:
????none (source filter)
??Outputs:
????#0: default (audio)
anoisesrc AVOptions:
??sample_rate????
