[FFmpeg-trac] #5268(avfilter:new): very high values for min level in astats metadata output

FFmpeg trac at avcodec.org
Wed Feb 24 21:40:24 CET 2016


#5268: very high values for min level in astats metadata output
--------------------------------------+----------------------------------
               Reporter:  dericed     |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avfilter
                Version:  git-master  |               Keywords:  astats
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
--------------------------------------+----------------------------------
 Summary of the bug:

 The `Min Level` values of the astats filter's metadata reporting seems a
 little high.
 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000


 How to reproduce:
 {{{
 ffprobe -f lavfi -i
 aevalsrc="sin(440*2*PI*t):s=8000:d=60,astats=metadata=1:reset=1:length=0.4"
 ffprobe version N-51172-gd94b11a Copyright (c) 2007-2016 the FFmpeg
 developers
   built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM
 3.6.0svn)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared
 --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables
 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-
 opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-
 libfreetype --enable-ffplay --enable-vda
   libavutil      55. 17.100 / 55. 17.100
   libavcodec     57. 24.101 / 57. 24.101
   libavformat    57. 24.101 / 57. 24.101
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 31.100 /  6. 31.100
   libavresample   3.  0.  0 /  3.  0.  0
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, lavfi, from
 'aevalsrc=sin(440*2*PI*t):s=8000:d=60,astats=metadata=1:reset=1:length=0.4':
   Duration: N/A, start: 0.000000, bitrate: 512 kb/s
     Stream #0:0: Audio: pcm_f64le, 8000 Hz, mono, dbl, 512 kb/s
 [Parsed_astats_1 @ 0x7f88a8c17480] Channel: 1
 [Parsed_astats_1 @ 0x7f88a8c17480] DC offset: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] Min level:
 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Max level: 0.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Min difference: -1.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Max difference: -1.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Mean difference: 0.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Peak level dB: -6153.053111
 [Parsed_astats_1 @ 0x7f88a8c17480] RMS level dB: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] RMS peak dB: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] RMS trough dB: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] Crest factor: 1.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Flat factor: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] Peak count: 0
 [Parsed_astats_1 @ 0x7f88a8c17480] Bit depth: 0
 [Parsed_astats_1 @ 0x7f88a8c17480] Overall
 [Parsed_astats_1 @ 0x7f88a8c17480] DC offset: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] Min level:
 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Max level: 0.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Min difference: -1.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Max difference: 0.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Mean difference: 0.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Peak level dB: -6153.053111
 [Parsed_astats_1 @ 0x7f88a8c17480] RMS level dB: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] RMS peak dB: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] RMS trough dB: 3082.547156
 [Parsed_astats_1 @ 0x7f88a8c17480] Flat factor: nan
 [Parsed_astats_1 @ 0x7f88a8c17480] Peak count: 0.000000
 [Parsed_astats_1 @ 0x7f88a8c17480] Bit depth: 0
 [Parsed_astats_1 @ 0x7f88a8c17480] Number of samples: 0
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5268>
FFmpeg <https://ffmpeg.org>
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