UID:
20260209121615
Created:
2026-02-09
Updated:
2026-02-09

ベランダの音 (2026-02-08)

#fieldrecording

  • 日時: 2026-02-08 10時頃
  • 場所: 家のベランダ
  • 音:
    • 雪融け水が落ちる音
    • 近所の音
    • 建物の先にある幹線道路の音
  • コメント: 前日の夜から雪が降っていて、珍しく積もった

ハンディレコーダーの写真

メモ: 音声加工の記録

> ffprobe -i 260208_0033.wav -show_entries format=duration -v quiet -of csv="p=0"
3814.344000

> ffmpeg -i 260208_0033.wav -filter:a volumedetect -f null - 2>&1 | grep "volume:"
[Parsed_volumedetect_0 @ 0x7f06f4003dc0] mean_volume: -54.6 dB
[Parsed_volumedetect_0 @ 0x7f06f4003dc0] max_volume: -17.6 dB

> ffmpeg -i 260208_0033.wav -ss 30 -to 3600 -af "volume=16.5dB,afade=t=in:st=30:d=5,afade=t=out:st=3595:d=5" 260208_0033_processed.wav -y
ffmpeg version n8.0.1 Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 15.2.1 (GCC) 20260103
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
  libavutil      60.  8.100 / 60.  8.100
  libavcodec     62. 11.100 / 62. 11.100
  libavformat    62.  3.100 / 62.  3.100
  libavdevice    62.  1.100 / 62.  1.100
  libavfilter    11.  4.100 / 11.  4.100
  libswscale      9.  1.100 /  9.  1.100
  libswresample   6.  1.100 /  6.  1.100
[aist#0:0/pcm_f32le @ 0x55cd650d9f80] Guessed Channel Layout: stereo
Input #0, wav, from '260208_0033.wav':
  Metadata:
    encoded_by      : TASCAM Portacapture X8
    date            : 2026-02-08
    creation_time   : 12:03:14
    time_reference  : 1899789696
    coding_history  : T=XRI 008c;XRI VER=0002;MAKER=TASCAM;MODEL=X8;FW VER=2.01;SOURCE=1:INT MIC,2:INT MIC;INPUT GAIN=1:HIGH,2:HIGH;LEVEL=1:29,2:29;AUTO_LEVEL=1:OFF,2:OFF;,
  Duration: 01:03:34.34, bitrate: 3072 kb/s
  Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, stereo, flt, 3072 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_f32le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to '260208_0033_processed.wav':
  Metadata:
    ITCH            : TASCAM Portacapture X8
    ICRD            : 2026-02-08
    coding_history  : T=XRI 008c;XRI VER=0002;MAKER=TASCAM;MODEL=X8;FW VER=2.01;SOURCE=1:INT MIC,2:INT MIC;INPUT GAIN=1:HIGH,2:HIGH;LEVEL=1:29,2:29;AUTO_LEVEL=1:OFF,2:OFF;,
    time_reference  : 1899789696
    ISFT            : Lavf62.3.100
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
    Metadata:
      encoder         : Lavc62.11.100 pcm_s16le
[out#0/wav @ 0x55cd650da1c0] video:0KiB audio:669375KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.000019%
size=  669375KiB time=00:59:30.00 bitrate=1536.0kbits/s speed=8.61e+03x elapsed=0:00:00.41

> ffmpeg -i 260208_0033_processed.wav -filter:a volumedetect -f null - 2>&1 | grep "volume:"
[Parsed_volumedetect_0 @ 0x7f3cd4003dc0] mean_volume: -38.3 dB
[Parsed_volumedetect_0 @ 0x7f3cd4003dc0] max_volume: -1.1 dB

> ffmpeg -i 260208_0033_processed.wav -codec:a libmp3lame -b:a 320k 260208_0033_processed.mp3 -y
ffmpeg version n8.0.1 Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 15.2.1 (GCC) 20260103
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
  libavutil      60.  8.100 / 60.  8.100
  libavcodec     62. 11.100 / 62. 11.100
  libavformat    62.  3.100 / 62.  3.100
  libavdevice    62.  1.100 / 62.  1.100
  libavfilter    11.  4.100 / 11.  4.100
  libswscale      9.  1.100 /  9.  1.100
  libswresample   6.  1.100 /  6.  1.100
Input #0, wav, from '260208_0033_processed.wav':
  Metadata:
    date            : 2026-02-08
    encoder         : Lavf62.3.100
    encoded_by      : TASCAM Portacapture X8
  Duration: 00:59:30.00, bitrate: 6144 kb/s
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 192000 Hz, stereo, s16, 6144 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to '260208_0033_processed.mp3':
  Metadata:
    TDRC            : 2026-02-08
    TENC            : TASCAM Portacapture X8
    TSSE            : Lavf62.3.100
  Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 320 kb/s
    Metadata:
      encoder         : Lavc62.11.100 libmp3lame
[out#0/mp3 @ 0x55af036ddbc0] video:0KiB audio:139454KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.000742%
size=  139455KiB time=00:59:30.00 bitrate= 320.0kbits/s speed= 114x elapsed=0:00:31.42

#public