corrado@corrado-n2-mantic:~$ cd Videos
corrado@corrado-n2-mantic:~/Videos$ ffmpeg -ss 1 -i DSCF0169.AVI -to 2 prova3.webm 
ffmpeg version 6.0-6ubuntu1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 13 (Ubuntu 13.2.0-2ubuntu1)
  configuration: --prefix=/usr --extra-version=6ubuntu1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-libjxl --enable-pocketsphinx --enable-librsvg --enable-libvpl --disable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, avi, from 'DSCF0169.AVI':                                                             
  Duration: 00:00:15.00, start: 0.000000, bitrate: 29294 kb/s
  Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 29072 kb/s, 30 fps, 30 tbr, 30 tbn
  Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, 1 channels, s16, 256 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> vp9 (libvpx-vp9))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> opus (libopus))
Press [q] to stop, [?] for help
[libopus @ 0x55b3ad0acf00] No bit rate set. Defaulting to 64000 bps.
[swscaler @ 0x55b3ad0dd180] deprecated pixel format used, make sure you did set range correctly 
[swscaler @ 0x55b3ad116fc0] deprecated pixel format used, make sure you did set range correctly 
    Last message repeated 2 times                                                               
[libvpx-vp9 @ 0x55b3ad09ddc0] v1.12.0
[libvpx-vp9 @ 0x55b3ad09ddc0] Neither bitrate nor constrained quality specified, using default CRF of 32
Output #0, webm, to 'prova3.webm':                                                              
  Metadata:
    encoder         : Lavf60.3.100
  Stream #0:0: Video: vp9, yuv422p(tv, bt470bg/unknown/unknown, progressive), 1280x720, q=2-31, 30 fps, 1k tbn
    Metadata:
      encoder         : Lavc60.3.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: opus, 16000 Hz, mono, s16, 64 kb/s
    Metadata:
      encoder         : Lavc60.3.100 libopus
frame=    4 fps=0.0 q=27.0 size=       1kB time=00:00:00.97 bitrate=   5.6kbits/s speed=1.78x   frame=   10 fps=9.1 q=21.0 size=       1kB time=00:00:01.17 bitrate=   4.6kbits/s speed=1.07x   frame=   15 fps=9.1 q=32.0 size=       1kB time=00:00:01.37 bitrate=   3.9kbits/s speed=0.836x  frame=   20 fps=9.0 q=21.0 size=       1kB time=00:00:01.57 bitrate=   3.4kbits/s speed=0.712x  frame=   25 fps=9.1 q=32.0 size=       1kB time=00:00:01.77 bitrate=   3.1kbits/s speed=0.646x  frame=   30 fps=9.1 q=32.0 size=       1kB time=00:00:01.83 bitrate=   3.0kbits/s speed=0.555x  frame=   35 fps=9.2 q=32.0 size=       1kB time=00:00:01.97 bitrate=   2.7kbits/s speed=0.517x  frame=   60 fps=9.1 q=32.0 Lsize=    2029kB time=00:00:01.99 bitrate=8339.0kbits/s speed=0.304x    
video:2009kB audio:19kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.091374%
corrado@corrado-n2-mantic:~/Videos$