[FFmpeg-trac] #9998(avfilter:new): Problem with atrim and astats

[FFmpeg]

#9998: Problem with atrim and astats
-------------------------------------+-------------------------------------
             Reporter:  Michael      |                     Type:  defect
  Koch                               |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Make a 5 seconds test file:

 ffmpeg -f lavfi -i sine -c:a pcm_s24le -t 5 -y test.wav

 Trim this file with an invalid start point (after the end of the stream),
 and then measure the Min_level with astats:

 ffmpeg -i test.wav -af
 atrim=start=6:duration=1,astats=measure_perchannel="Min_level":measure_overall=none
 -f null -

 There is no warning or error message, but a nonsense output for the level:


 C:\Users\astro\Desktop\problem>ffmpeg -i test.wav -af
 atrim=start=6:duration=1,astats=measure_perchannel="Min_level":measure_overall=none
 -f null -
 ffmpeg version 2022-10-24-git-d79c240196-full_build-www.gyan.dev Copyright
 (c) 2000-2022 the FFmpeg developers
   built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static --disable-
 w32threads --disable-autodetect --enable-fontconfig --enable-iconv
 --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma
 --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt
 --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
 --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d
 --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e
 --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl
 --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-
 libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-
 liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-
 amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec
 --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-
 libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-
 libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-
 libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora
 --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-
 libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex
 --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite
 --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-
 chromaprint
   libavutil      57. 39.101 / 57. 39.101
   libavcodec     59. 51.100 / 59. 51.100
   libavformat    59. 34.101 / 59. 34.101
   libavdevice    59.  8.101 / 59.  8.101
   libavfilter     8. 49.101 /  8. 49.101
   libswscale      6.  8.112 /  6.  8.112
   libswresample   4.  9.100 /  4.  9.100
   libpostproc    56.  7.100 / 56.  7.100
 Input #0, wav, from 'test.wav':
   Metadata:
     encoder         : Lavf59.34.101
   Duration: 00:00:05.00, bitrate: 1058 kb/s
   Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 44100 Hz, mono,
 s32 (24 bit), 1058 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s24le (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf59.34.101
   Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
     Metadata:
       encoder         : Lavc59.51.100 pcm_s16le
 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A    s/s speed=N/A
 video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 Output file is empty, nothing was encoded (check -ss / -t / -frames
 parameters if used)
 [Parsed_astats_1 @ 0000014cea433a80] Channel: 1
 [Parsed_astats_1 @ 0000014cea433a80] Min level:
 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9998>
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