Could not find tag for codec subrip in stream #2, codec not currently supported in container

ffmpeg 添加软字幕失败

错误信息如下：

Input #1, srt, from '/Users/bytedance/Downloads/Little.Women.2019.1080p.BluRay.x264.DTS-HD.MA.5.1-FGT/Little.Women.2019.1080p.BluRay.x264.DTS-HD.MA.5.1-FGT.英文.srt':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Subtitle: subrip
[mp4 @ 0x7fa453008800] Could not find tag for codec subrip in stream #2, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #1:0 -> #0:2 (subrip (srt) -> subrip (srt))
    Last message repeated 1 times

执行失败原因：
由于输出格式为mp4，不支持 srt 字幕，不能识别报错了

解决：
方法1：修改输出视频格式为 mkv
ffmpeg -i input.mp4 -i input.srt -c copy output.mkv -y

方法2：修改字幕编码格式为：mov_text，添加 -c:s mov_text
ffmpeg -i input.mp4 -i input.srt -c copy -c:s mov_text output.mp4 -y