[FFmpeg-user] Adeclip limited to 16bits ?

[Sylvain Leforestier]

Hi every boby,
I found pleasant to use ffmpeg to clean my records from old CD using Matlab
:
 *   audiowrite('t.wav',d/2,f,'bitspersample',32);*


*    [sta,ret]=system ('ffmpeg -i /home/papa/Matlab/t.wav -filter:a
''adeclip=m=s:n=500:t=5'' /home/papa/Matlab/tt.wav -y');
du=audioread('tt.wav')*2;*

I first write in floating32 the t.wav (with a factor 1/2 to let some
dynamic availability)
I use FFMPEG to declip t.wav in tt.wav but here is the issue the output is
s16 and it refuse to do it in floating format  :





























*   'ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg
developers       built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
 configuration: --prefix=/usr --extra-version=1ubuntu0.1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --enable-avresample --disable-filter=resample
--enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libcodec2 --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
--enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex
--enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq
--enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
--enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm
--enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r
--enable-libx264 --enable-shared       libavutil      56. 31.100 / 56.
31.100       libavcodec     58. 54.100 / 58. 54.100       libavformat
 58. 29.100 / 58. 29.100       libavdevice    58.  8.100 / 58.  8.100
 libavfilter     7. 57.100 /  7. 57.100       libavresample   4.  0.  0 /
 4.  0.  0       libswscale      5.  5.100 /  5.  5.100       libswresample
  3.  5.100 /  3.  5.100       libpostproc    55.  5.100 / 55.  5.100
[0;33mGuessed Channel Layout for Input Stream #0.0 : stereo      [0mInput
#0, wav, from '/home/papa/Matlab/t.wav':       Duration: 00:03:54.87,
bitrate: 2822 kb/s         Stream #0:0: Audio: pcm_f32le ([3][0][0][0] /
0x0003), 44100 Hz, stereo, flt, 2822 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 '/home/papa/Matlab/tt.wav':
 Metadata:         ISFT            : Lavf58.29.100         Stream #0:0:
Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
       Metadata:           encoder         : Lavc58.54.100 pcm_s16le
 size=    1024kB time=00:00:06.56 bitrate=1277.2kbits/s speed=13.1x
 size=    2048kB time=00:00:12.91 bitrate=1298.9kbits/s speed=12.9x
 size=    3328kB time=00:00:19.54 bitrate=1395.2kbits/s speed=  13x
 size=    4352kB time=00:00:26.02 bitrate=1369.8kbits/s speed=  13x
 size=    5376kB time=00:00:32.66 bitrate=1348.3kbits/s speed=13.1x    *

As you can see it maps before the f32le in s16le !
It seems (for my understanding) that the adeclip filter is only drawn for
16 bits.

My question : is a way to use adeclip in at least 24bits ?

Best regards.