[FFmpeg-user] How does ffprobe determine 'fps'?

[Michael Glenn Williams]

Hey Mark +1 LMK

On Wed, Apr 29, 2020 at 12:52 AM Mark Filipak <
markfilipak.windows+ffmpeg at gmail.com> wrote:

> H:\VIDEO_TS>ffprobe VTS_01_1.VOB
> ffprobe version git-2020-04-20-cacdac8 Copyright (c) 2007-2020 the FFmpeg
> developers
>    built with gcc 9.3.1 (GCC) 20200328
>    configuration: --enable-gpl --enable-version3 --enable-sdl2
> --enable-fontconfig --enable-gnutls
> --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray
> --enable-libfreetype
> --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenjpeg
> --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
> --enable-libsrt
> --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
> --enable-libwebp
> --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg
> --enable-lzma --enable-zlib
> --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis
> --enable-libvo-amrwbenc
> --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom
> --disable-w32threads
> --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid
> --enable-d3d11va --enable-nvenc
> --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
> --enable-amf
>    libavutil      56. 42.102 / 56. 42.102
>    libavcodec     58. 80.100 / 58. 80.100
>    libavformat    58. 42.100 / 58. 42.100
>    libavdevice    58.  9.103 / 58.  9.103
>    libavfilter     7. 79.100 /  7. 79.100
>    libswscale      5.  6.101 /  5.  6.101
>    libswresample   3.  6.100 /  3.  6.100
>    libpostproc    55.  6.100 / 55.  6.100
> Input #0, mpeg, from 'VTS_01_1.VOB':
>    Duration: 00:22:25.82, start: 0.039456, bitrate: 6382 kb/s
>      Stream #0:0[0x1bf]: Data: dvd_nav_packet
>      Stream #0:1[0x1e0]: Video: ... 29.97 fps, 59.94 tbr, 90k tbn, 59.94
> tbc
>                                     |||||||||
>                                     How does ffprobe determine this?
>                                     Can you give me a link to the code?
>
> Thanks,
> Mark.
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