yum install epel-release
rpm -v --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro
rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm
yum install ffmpeg ffmpeg-devel
ffmpeg -version
ffmpeg -h

yum list installed  | grep ffmpeg
yum remove ffmpeg.x86_64
yum -y localinstall ffmpeg-3.2.4-1.el7.centos.x86_64.rpm

ffmpeg -i input.wmv output.mp4
ffmpeg -i input.wmv -c:v libx264 -c:a aac output.mp4

wmv转为mp4
for i in *.wmv; do ffmpeg -i "$i" "${i%.*}.mp4"; done

mp4视频转为mp3音频
for i in *.mp4; do ffmpeg -i "$i" -acodec mp3 "${i%.*}.mp3"; done

ffmpeg -i 1.mp4 -vf scale=-1:360 2.mp4
ffmpeg -i 1.mp4 -vf scale=850:480 2.mp4

ffmpeg -i 1.mp4 -filter:v fps=24,scale=-1:360 output/1.mp4

ffmpeg -i 1.mp4 -b:v 500K -vf scale=-1:360 output/1.mp4

// codec option has been set to copy
ffmpeg -i 01.mp4 -map 0:v:0 -map 0:a:0 -c:v copy -c:a copy output/01.mp4

// all included streams will be transcoded. The encoders chosen will be the default ones registered by each output format
ffmpeg -i 01.mp4 -map 0:v:0 -map 0:a:0 output/01.mp4

// encoders specifically
ffmpeg -i 01.mp4 -map 0:v:0 -map 0:a:0 -c:v libx264 -c:a ac3 output/01.mp4

ffmpeg -i 1.mp4 -ss 00:00:30.000 -t 00:01:01.001 -vcodec copy output/1.mp4

ffmpeg -i part1.mp4 -i part2.mp4 -i part3.mp4 -i part4.mp4 \
-filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] [3:v] [3:a] \
concat=n=4:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" full.mp4

ffmpeg -i left.mp4 -i right.mp4 -filter_complex \
"[1:v]tpad=start_duration=32.366:start_mode=clone[v1]; \ 
[0:v:0][v1]vstack=inputs=2,format=yuv420p[v];[0:a][1:a]concat=n=2:v=0:a=1[a]" \
-map "[v]" -map "[a]" -c:v libx264 -tune film -crf 16 -b:a 256k -movflags +faststart output.mp4

ffprobe -i 1.mp4 -v quiet -print_format json -show_format -show_streams

ffmpeg -i 1.mp4 -b:v 500K -profile:v high -level:v 3.1 -refs 3 2.mp4

cat /proc/version
cat /etc/redhat-release

getenforce

setenforce 0

vi /etc/selinux/config
SELINUX=disabled

firewall-cmd --state
systemctl stop firewalld.service
systemctl disable firewalld.service

-- 开放端口
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --reload
firewall-cmd --zone=public --query-port=80/tcp
firewall-cmd --zone=public --remove-port=80/tcp

locale

vi /etc/sysconfig/network-scripts/ifcfg-enp0s3
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.137.101
NETMASK=255.255.255.0
GATEWAY=192.168.137.1

vi /etc/sysconfig/network
DNS1=114.114.114.114
DNS2=1.1.1.1
HOSTNAME=oracle

service network restart

-- 修改上限
vi /etc/profile
HISTSIZE=5000

-- 记录时间
vi ~/.bash_profile
export HISTTIMEFORMAT='%F %T '
source ~/.bash_profile

last -f /var/log/wtmp

stat

mount /dev/sdb1 /dy/upload
umount -v /dev/sdb1

/etc/fstab

fdisk -l
fdisk /dev/sdb
n 新建分区
p 主分区
t
L 指定分区格式
8e
w
reboot

fdisk -l
pvcreate /dev/sda3
vgextend centos /dev/sda3
vgdisplay
lvresize -L +10G /dev/mapper/centos-root
resize2fs /dev/mapper/centos-root
xfs_growfs /dev/mapper/centos-root