ffmpeg, crop video

- Posted in ffmpeg by

Crop 8 seconds of a video, starting from 3 seconds, using the copy method (no reencode)

ffmpeg -i input.mp4 -ss 00:00:03 -t 00:00:08 -c copy output-crop.mp4

ffmpeg, rip audio from video

- Posted in ffmpeg by

Rip 3 seconds of audio from a video, starting from the 7 second mark:

ffmpeg -ss 7 -t 3.0 -i source.mp4 output.mp3

EX3400 boot loop, cannot find kernel

- Posted in Juniper by

EX3400 is boot looping. The kernel cannot be found, reinstall is required.

Power off the EX3400

1) Download the appropriate image for the device (ex: "junos-install-media-usb-arm-32-15.1X53-D59.4-limited.img.gz")

2) Extract the image

3) Write the extracted image to a USB-device using dd with bs=1m or bs=1M depending on version

4) Insert the USB-device and power on the EX3400

5) Hit 5 for [M]ore options and 5 again for [B]oot prompt

6) Run lsdev and confirm device disk1s1a exists

7) Run set currdev="disk1s1a"

8) Run include /boot/loader.rc to reboot the device

9) Wait for the installation to complete - be patient.

ESXi 6.5, switch to legacy USB-stack

- Posted in VMware by

Disable vmkusb module in ESXi 6.5 and switch to legacy stack:

esxcli system module set -m=vmkusb -e=FALSE

Reenable vmkusb:

esxcli system module set -m=vmkusb -e=TRUE

Either change requires rebooting of ESXi

Disable native driver and revert to sata-ahci:

esxcli system module set --enabled=false --module=vmw_ahci

Reenable native driver from sata-ahci:

esxcli system module set --enabled=true --module=vmw_ahci

Simple pyproxy TCP example

- Posted in Linux by

./pyproxy.py --tcp -s -d domain.tld:12345 -v

Script source-code: download here

Use wget and perl to reboot a Netgear ISP provided CPE/modem/router from comandline. Replace IP-address and 'REALPASSWORD' with your own settings

id=$(wget --quiet -O- --http-user admin --http-password password | perl -lne '/id=([0-9]+)/ && print $1'); wget --quiet --http-user admin --http-password REALPASSWORD --post-data 'buttonSelect=2'"$id"
openssl pkcs12 -inkey certificate.key -in certificate.pem -export -out certificate.pfx

Install the plugin for parsing Apache httpd config files:

sudo apt install python3-certbot-apache