FFmpeg转封装（1）

MP4在FFmpeg中的Demuxer

查看MP4文件的Demuxer信息

ffmpeg -h demuxer=mp4

ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: 
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
Demuxer mov,mp4,m4a,3gp,3g2,mj2 [QuickTime / MOV]:
    Common extensions: mov,mp4,m4a,3gp,3g2,mj2.
mov,mp4,m4a,3gp,3g2,mj2 AVOptions:
  -use_absolute_path <boolean>    .D.V..... allow using absolute path when opening alias, this is a possible security issue (default false)
  -seek_streams_individually <boolean>    .D.V..... Seek each stream individually to the to the closest point (default true)
  -ignore_editlist   <boolean>    .D.V..... Ignore the edit list atom. (default false)
  -advanced_editlist <boolean>    .D.V..... Modify the AVIndex according to the editlists. Use this option to decode in the order specified by the edits. (default true)
  -ignore_chapters   <boolean>    .D.V.....  (default false)
  -use_mfra_for      <int>        .D.V..... use mfra for fragment timestamps (from -1 to 2) (default auto)
     auto                         .D.V..... auto
     dts                          .D.V..... dts
     pts                          .D.V..... pts
  -export_all        <boolean>    .D.V..... Export unrecognized metadata entries (default false)
  -export_xmp        <boolean>    .D.V..... Export full XMP metadata (default false)
  -activation_bytes  <binary>     .D....... Secret bytes for Audible AAX files
  -audible_fixed_key <binary>     .D....... Fixed key used for handling Audible AAX files
  -decryption_key    <binary>     .D....... The media decryption key (hex)
  -enable_drefs      <boolean>    .D.V..... Enable external track support. (default false)