test.vob and testaac.mp4 volumedetect

[mpeg @ 0000022cb3b72f00] start time for stream 0 is not set in estimate_timings_from_pts
Input #0, mpeg, from 'test.vob':
  Duration: 00:00:18.93, start: 0.490000, bitrate: 9635 kb/s
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
    Stream #0:2[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], Closed Captions, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Side data:
      cpb: bitrate max/min/avg: 9450000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream mapping:
  Stream #0:2 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (ac3 (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'NUL':
  Metadata:
    encoder         : Lavf58.43.100
    Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
    Side data:
      cpb: bitrate max/min/avg: 9450000/0/0 buffer size: 1835008 vbv_delay: N/A
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    Metadata:
      encoder         : Lavc58.86.101 pcm_s16le
[null @ 0000022cb3b79400] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 376320 >= 376320
[null @ 0000022cb3b79400] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 470016 >= 470016
[null @ 0000022cb3b79400] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 563712 >= 563712
[null @ 0000022cb3b79400] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 657408 >= 657408
[null @ 0000022cb3b79400] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 751104 >= 751104
[null @ 0000022cb3b79400] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 844800 >= 844800
frame=  461 fps=0.0 q=-1.0 Lsize=N/A time=00:00:18.80 bitrate=N/A speed= 140x
video:21276kB audio:3516kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[Parsed_volumedetect_0 @ 0000022cb40e3040] n_samples: 1800192
[Parsed_volumedetect_0 @ 0000022cb40e3040] mean_volume: -24.4 dB
[Parsed_volumedetect_0 @ 0000022cb40e3040] max_volume: -10.4 dB
[Parsed_volumedetect_0 @ 0000022cb40e3040] histogram_10db: 23
[Parsed_volumedetect_0 @ 0000022cb40e3040] histogram_11db: 177
[Parsed_volumedetect_0 @ 0000022cb40e3040] histogram_12db: 640
[Parsed_volumedetect_0 @ 0000022cb40e3040] histogram_13db: 2152
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testaac.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1
    creation_time   : 2020-05-26T19:14:00.000000Z
  Duration: 00:00:18.44, start: 0.000000, bitrate: 2757 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x560 [SAR 12:11 DAR 108:77], 2497 kb/s, 25 fps, 25 tbr, 100 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2020-05-26T19:14:00.000000Z
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      creation_time   : 2020-05-26T19:13:58.000000Z
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'NUL':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1
    encoder         : Lavf58.43.100
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x560 [SAR 12:11 DAR 108:77], q=2-31, 2497 kb/s, 25 fps, 25 tbr, 100 tbn, 100 tbc (default)
    Metadata:
      creation_time   : 2020-05-26T19:14:00.000000Z
    Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2020-05-26T19:13:58.000000Z
      encoder         : Lavc58.86.101 pcm_s16le
frame=  461 fps=0.0 q=-1.0 Lsize=N/A time=00:00:18.36 bitrate=N/A speed= 483x
video:5622kB audio:3444kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[Parsed_volumedetect_0 @ 000002c39d3dd000] n_samples: 1763328
[Parsed_volumedetect_0 @ 000002c39d3dd000] mean_volume: -14.0 dB
[Parsed_volumedetect_0 @ 000002c39d3dd000] max_volume: -0.1 dB
[Parsed_volumedetect_0 @ 000002c39d3dd000] histogram_0db: 64
[Parsed_volumedetect_0 @ 000002c39d3dd000] histogram_1db: 269
[Parsed_volumedetect_0 @ 000002c39d3dd000] histogram_2db: 1102
[Parsed_volumedetect_0 @ 000002c39d3dd000] histogram_3db: 3221