diff --git a/doc/FFmpeg_command_line.md b/doc/FFmpeg_command_line.md
index 0566981..fe145ea 100644
--- a/doc/FFmpeg_command_line.md
+++ b/doc/FFmpeg_command_line.md
@@ -11,14 +11,14 @@ Print help / information / capabilities:
-version show version
-formats show available formats
-muxers show available muxers
--demuxers show available demuxers
+-demuxers show available demuxers
-devices show available devices
-codecs show available codecs
-decoders show available decoders
-encoders show available encoders
--bsfs show available bit stream filters
+-bsfs show available bit stream filters
-protocols show available protocols
--filters show available filters
+-filters show available filters
-pix_fmts show available pixel formats
-sample_fmts show available audio sample formats
-hwaccels show available HW acceleration methods
@@ -184,9 +184,6 @@ ffmpeg -ss 20 -accurate_seek -t 10 -i input.mp4 -an -r 5 %3d.jpg
使用setpts设置视频速度,atempo设置音频速度:
ffmpeg -i in.mp4 -filter_complex [0:v]setpts=%.2f*PTS[v];[0:a]atempo=%.2f[a] -map [v] -map [a] out.mp4
-### 3.12 旋转视频
-ffmpeg -i in.mp4 -c copy -metadata:s\:v:0 rotate=90 out.mp4
-
# 二、ffplay命令行
ffplay主要用于播放视频,也可以播放网络流,示例如下:
ffplay -i beyond.mp4