admin 2025-07-07, 10:34 AM
download ffmpeg file from https://www.gyan.dev/ffmpeg/builds/ >> around 56m bytes
unzip it
converter video type from mkv to mp4
split video by size??
split video by time
if you don't use -c copy , it will re-encode
This is an option to trim via stream copy. (NB: Very fast)
unzip it
converter video type from mkv to mp4
碼:
ffmpeg-2025-07-01-git-11d1b71c31-full_build\bin\ffmpeg.exe -i file1.mkv file2.mp4split video by size??
split video by time
碼:
ffmpeg -i input.mp4 -ss 00:00:00 -to 00:10:00 -c copy output1.mp4
ffmpeg -i input.mp4 -ss 00:10:00 -to 00:20:00 -c copy output2.mp4This is an option to trim via stream copy. (NB: Very fast)
碼:
$ ffmpeg -i source.mp4 -ss 0 -t 600 first-10-min.mp4
$ ffmpeg -i source.mp4 -ss 600 -t 600 second-10-min.mp4
$ ffmpeg -i source.mp4 -ss 1200 -t 600 third-10-min.mp4
admin 2025-07-01, 10:03 AM
碼:
ssh-keygen -t rsa -b 4096 -C "user@zhtw.com" -f ~/.ssh/user_sshkey
cat ~/.ssh/user_sshkey.pub >> ~/.ssh/authorized_keys
chmod 700 ~/.ssh/authorized_keysnow root can login to user by
ssh user@127.0.0.1 -i /home/user/.ssh/user_sshkey
admin 2025-07-01, 09:50 AM
delete user
delete directory /home/username
delete username line in /etc/password
delete username line in /etc/group
add a new user
Note: do not use useradd command
delete directory /home/username
delete username line in /etc/password
delete username line in /etc/group
碼:
sudo userdel -r usernameadd a new user
碼:
sudo adduser usernameNote: do not use useradd command
admin 2025-06-24, 12:05 PM
- c# can do most of the thing in windows,
- very easy to create a GUI tool in windows
- now it can create program for linux
admin 2025-06-24, 11:58 AM
c 語言的區塊
python 的表示方式
碼:
if ( a > 1) {
printf("hi\n");
printf(" ... \n");
}
C 也可以寫成一整行
if ( a > 1) { printf("hi\n"); printf(" ... \n"); }python 的表示方式
碼:
if a>1 :
print("hi")
print(" ... ")
python 不可以寫成一整行
admin 2025-06-24, 11:51 AM
1. download the Visual studio community version
2. install the tools "VisualStudioSetup.exe"
2. install the tools "VisualStudioSetup.exe"
- remember to select c#
admin 2025-06-15, 04:48 PM
in windows, the key used by ssh need to change permission
引用:icacls oc1.key /inheritance:r
icacls oc1.key /grant "%username%":F
admin 2025-06-10, 09:10 AM
碼:
LANG=C xdg-user-dirs-update --force1. open a terminal windows
2. type the above command
3. logout and login
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