我正在尝试使用 ffmpeg 摆脱 Mp4 容器中的数据（字幕）流。
这是ffprobe的截图：
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.m4v':
Metadata:
major_brand : isom
minor_version : 2
compatible_brands: isomiso2avc1mp41
creation_time : 2018-01-19T15:10:48.000000Z
Duration: 00:00:42.17, start: 0.000000, bitrate: 6260 kb/s
Chapter #0:0: start 0.000000, end 42.166000
Metadata:
title : Chapter 1
Stream #0:0(eng): Data: bin_data (text / 0x74786574), 0 kb/s (default)
Metadata:
creation_time : 2018-01-19T15:10:48.000000Z
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 317 kb/s (default)
Metadata:
creation_time : 2018-01-19T15:10:48.000000Z …