Wav Agent outputs the following when I drag the same file in, so the data has to be in the file somewhere, and I just don't know how to look for it. WavAgent: StartTC: 13:09:21:18

Now FFMpeg with the following arguments creates the following :

ffprobe -i "_Audio Test_CRO_01.wav" -print_format json -show_streams -show_format



    ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the FFmpeg developers
      built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
      configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
      libavutil      55. 78.100 / 55. 78.100
      libavcodec     57.107.100 / 57.107.100
      libavformat    57. 83.100 / 57. 83.100
      libavdevice    57. 10.100 / 57. 10.100
      libavfilter     6.107.100 /  6.107.100
      libavresample   3.  7.  0 /  3.  7.  0
      libswscale      4.  8.100 /  4.  8.100
      libswresample   2.  9.100 /  2.  9.100
      libpostproc    54.  7.100 / 54.  7.100
    {
    Input #0, wav, from '_Audio Test_CRO_01.wav':
      Metadata:
        encoded_by      : Pro Tools
        originator_reference: JTFyPBDM2GpaaaGk
        date            : 2018-02-01
        creation_time   : 13:28:24
        time_reference  : 2273356800
      Duration: 00:00:48.22, bitrate: 1197 kb/s
        Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
        "streams": [
            {
                "index": 0,
                "codec_name": "pcm_s24le",
                "codec_long_name": "PCM signed 24-bit little-endian",
                "codec_type": "audio",
                "codec_time_base": "1/48000",
                "codec_tag_string": "[1][0][0][0]",
                "codec_tag": "0x0001",
                "sample_fmt": "s32",
                "sample_rate": "48000",
                "channels": 1,
                "bits_per_sample": 24,
                "r_frame_rate": "0/0",
                "avg_frame_rate": "0/0",
                "time_base": "1/48000",
                "duration_ts": 2314530,
                "duration": "48.219375",
                "bit_rate": "1152000",
                "bits_per_raw_sample": "24",
                "disposition": {
                    "default": 0,
                    "dub": 0,
                    "original": 0,
                    "comment": 0,
                    "lyrics": 0,
                    "karaoke": 0,
                    "forced": 0,
                    "hearing_impaired": 0,
                    "visual_impaired": 0,
                    "clean_effects": 0,
                    "attached_pic": 0,
                    "timed_thumbnails": 0
                }
            }
        ],
        "format": {
            "filename": "_Audio Test_CRO_01.wav",
            "nb_streams": 1,
            "nb_programs": 0,
            "format_name": "wav",
            "format_long_name": "WAV / WAVE (Waveform Audio)",
            "duration": "48.219375",
            "size": "7215254",
            "bit_rate": "1197071",
            "probe_score": 99,
            "tags": {
                "encoded_by": "Pro Tools",
                "originator_reference": "JTFyPBDM2GpaaaGk",
                "date": "2018-02-01",
                "creation_time": "13:28:24",
                "time_reference": "2273356800"
            }
        }
    }

Is time_reference a clue? I have calculated that from Jan 1 1970, but that's not accurate. I'd like to know how I can get the start frame of timecode from this wav file.