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我有来自两个视频源的数百部电影。一种是 25 fps 的 MP4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MAH00607.MP4':
  Metadata:
    major_brand     : MSNV
    minor_version   : 22675568
    compatible_brands: MSNVmp42isom
    creation_time   : 2017-06-14T20:20:24.000000Z
  Duration: 00:00:12.48, start: 0.000000, bitrate: 2795 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4), 1280x720 [SAR 1:1 DAR 16:9], 2664 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2017-06-14T20:20:24.000000Z
      handler_name    : Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, …