ffmpeg -loglevel info -y -i peppers_267x267.png -pix_fmt nv12 peppers_267x267.nv12.yuv
ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
  built with Apple clang version 15.0.0 (clang-1500.3.9.4)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_6 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      58. 29.100 / 58. 29.100
  libavcodec     60. 31.102 / 60. 31.102
  libavformat    60. 16.100 / 60. 16.100
  libavdevice    60.  3.100 / 60.  3.100
  libavfilter     9. 12.100 /  9. 12.100
  libswscale      7.  5.100 /  7.  5.100
  libswresample   4. 12.100 /  4. 12.100
  libpostproc    57.  3.100 / 57.  3.100
Input #0, image2, from 'peppers_267x267.png':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 7509 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 267x267 [SAR 113:113 DAR 1:1], 25 fps, 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[swscaler @ 0x138018000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x118008000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x1380b8000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x120008000] deprecated pixel format used, make sure you did set range correctly
Output #0, rawvideo, to 'peppers_267x267.nv12.yuv':
  Metadata:
    encoder         : Lavf60.16.100
  Stream #0:0: Video: rawvideo (NV12 / 0x3231564E), nv12(tv, bt470bg/unknown/unknown, progressive), 267x267 [SAR 1:1 DAR 1:1], q=2-31, 21386 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc60.31.102 rawvideo
frame=    0 fps=0.0 q=0.0 size=       0kB time=N/A bitrate=N/A speed=N/A    
[out#0/rawvideo @ 0x600000a54240] video:105kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
frame=    1 fps=0.0 q=-0.0 Lsize=     105kB time=00:00:00.00 bitrate=N/A speed=   0x