Feb 1 2015

ffmpeg join / concate 2 or more ts video files

first cut your video file:
ffmpeg -i gekocht.ts -ss 56:21 -t 9:27 -c:v copy -c:a copy part2.ts
-t = length

then concat

ffmpeg -i "concat:part1.ts|part2.ts" -c copy out.ts

Dec 14 2014

433 mhz antennen länge

Lambda = c / f
Lambda = 300.000.000 / 433000000
0,6928406466512702 meter

Lambda /4
0,1732101616628176 meter
17,3 cm

c= 299 792 458 m/s, but for sake of simplicity use 300.000.000

May 7 2014

Dreambox / VU+ / Enigma2 – settings

Timer-Einstellungen -> /etc/enigma2/timer.xml
Autotimer-Einstellungen -> /etc/enigma2/autotimer.xml
WPA-Passwort -> /etc/wpa_supplicant.conf
Dreambox Passwort -> /etc/passwd
EPG Refresh Einstellungen -> /etc/enigma2/epgrefresh.xml
Netzwerk Automappings -> /etc/auto.network
NFS-Server Einstellungen -> /etc/exports
Boquets ->
Userbouquets /etc/enigma2/userbouquets.XXX.tv & radio und alternatives.XXX.tv &radio
Jugendschutz-Einstellungen -> /etc/enigma2/settings und ( /etc/enigma2/blacklist oder /etc/enigma2/whitelist, je nach Einstellung)
Satelliten-Einstellungen -> /etc/enigma2/lamedb und /etc/tuxbox/satellites.xml
Quickbutton / Plugin Einstellungen -> /etc/enigma2/settings
Webinterface Einstellungen (Ports etc.) -> ? /etc/enigma2/settings

Mar 10 2014

list installed packages with theier size

dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -n

Mar 9 2014

forkbomb – if you want to test watchdog or so

make sure, you do not have any important stuff running. The following lines will produce endless load to test watchdog etc…
: (){ :|:& };:

Mar 5 2014

resize an raspi sd card image

losetup -f –show my.img
-> we have now mounted image as loop0

partprobe /dev/loop0
-> we have now the partitions which is required for gparted

gparted /dev/loop0
-> resize as usual now and apply

losetup -d /dev/loop0
-> loop not needed anymore

fdisk -l my.img
Platte my.img: 8068 MByte, 8068792320 Byte
255 Köpfe, 63 Sektoren/Spur, 980 Zylinder, zusammen 15759360 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Festplattenidentifikation: 0x000981cb

Gerät boot. Anfang Ende Blöcke Id System
my.img1 8192 122879 57344 c W95 FAT32 (LBA)
my.img2 122880 15759359 7818240 83 Linux

so, end is at 15759359 (*512 bs)

truncate –size=$[(15759359+1)*512] my.img

this should work now. if not, let me know.

new created SD card can resized then again with gparted.

Feb 20 2014

fritzbox 7390 – module building – MIPS_24K vs MIPS32_R2

just change arch/mips/include/asm/module.h


building modules for a different system is not always an easy task.
required information’s and where to get:

1. cat /proc/cpuinfo to find out what kind of cpu (mips,arm,sh4 etc)
2. file busybox – any elf file and find out if LSB or MSB , also CPU type should be there.
3. get crosstool-chain prebuild or build one yourself -> crosstool-ng
4. get the kernel sources -> cat /proc/version / uname -a
5. make mrproper, make menuconfig, make < - after this you should have all required files like Module.symvers and .config 6. go in your module directory and create your makefile: obj-m += hello.o

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

type make, close your eyes and press enter…

Feb 19 2014

make(-file) modules

obj-m = ati_remote.o
KVERSION = $(shell uname -r)
make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules
make -C /lib/modules/$(KVERSION)/build M=$(PWD) clean

Jan 7 2014


here is the first version of okotlight.exe Beta v0.1.
feel free to use it in your _not_ commercial products.okto1




Download for Windows: oktolight Beta v0.1
For linux use boblight
For Enigma2 use Boblight-enigma2

Jan 4 2014

valgrind and gprof – performance messure tools

to create a graph of all call from your executable, use valgrind:

valgrind --tool=callgrind --dump-instr=yes --simulate-cache=yes --collect-jumps=yes program arguments

then open in kcachegrind (also available for Windows)


gprof: you need to compile with -pg. then a gmon.out file will be created.

open that file with:

gprof program gmon.out > gprof.txt
gprof program gmon.out | less