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by ghans
Mon Jul 16, 2018 6:39 am
Forum: General discussion
Topic: Want to play back first frame of video, while still recording, for an FX trick.
Replies: 1
Views: 45

Re: Want to play back first frame of video, while still recording, for an FX trick.

I suggest you should take a serious look at the Python programming language. The picamera library is probably one of the best-documented pieces of software for the official camera, but only works with Python to date. The picamera documentation comes with multiple recipes for Circular Buffers. This i...
by ghans
Sun Jul 15, 2018 12:44 pm
Forum: Add-ons
Topic: Hardware Specification of the RPi's
Replies: 14
Views: 281

Re: Hardware Specification of the RPi's

EMI and ROHS data are in the documentation area, for quite a bunch of national certifications (including the US FCC)

ghans
by ghans
Fri Jul 13, 2018 7:10 am
Forum: General discussion
Topic: Need help with camera not supported in camera libraries
Replies: 6
Views: 184

Re: Need help with camera not supported in camera libraries

This is next to impossible. USB and FireWire are radically different, a converter would be neither sensible or economically sound in your situation. Last but not least the FireWire device drivers (those part of the Linux kernel, mind you) would likely have to be rewritten or adapted. That would be p...
by ghans
Fri Jul 13, 2018 6:20 am
Forum: C/C++
Topic: How to creat GUI in C++
Replies: 3
Views: 217

Re: How to creat GUI in C++

QtCreator seems like a good choice.
Please note that WinSock does not work on Linux. Qt itself might have networking libraries so that you can use the same code on Windows and Linux.

ghans
by ghans
Fri Jul 13, 2018 5:22 am
Forum: Beginners
Topic: audio project in mind, could it be done? need your ideas/suggestions
Replies: 5
Views: 220

Re: audio project in mind, could it be done? need your ideas/suggestions

Why has it to be raw WAV files ? My calculations say that you need a ring buffer of 2.6 MB @ 30s with WAV, any Pi should be able to manage that easily ?

ghans
by ghans
Thu Jul 12, 2018 4:43 am
Forum: Deutsch
Topic: Raspberry mit Swift-App steuern, ohne Internet
Replies: 2
Views: 99

Re: Raspberry mit Swift-App steuern, ohne Internet

Der Raspberry Pi Zero W,B3 und B3+ haben einen WiFi Chip und können als Hotspot fungieren. Andere Modelle brauchen bloß einen billigen USB WiFi dongle.

ghans
by ghans
Thu Jul 12, 2018 4:27 am
Forum: Beginners
Topic: Yes/No file contents query
Replies: 6
Views: 179

Re: Yes/No file contents query

Which protocol does the file server on your phone support ? Without that i can only give very general hints which are obvious: Linux can mount remote directories, provided the protocol is supported. Remote directories are indistinguishable from local ones to 90 % of Linux apps, especially when using...
by ghans
Fri Jul 06, 2018 10:15 am
Forum: Deutsch
Topic: Autostart Programm oder Datei ausführen
Replies: 13
Views: 410

Re: Autostart Programm oder Datei ausführen

sudo erscheint mir unnötig. Ich vermute das udevs berühmtes Feature alle Prozesse (inklusive Kinder und Enkel) die über ein udev-Skript gestartet wurden, nach einem kurzen Timeout zu einfach zu killen hier zum Tragen kommt. Umgehen kann man das indem zwei Skripte schreibt. Das erste trägt das zweite...
by ghans
Thu Jul 05, 2018 9:05 pm
Forum: Other projects
Topic: looking for help to tweet screenshot of a .exe file
Replies: 9
Views: 314

Re: looking for help to tweet screenshot of a .exe file

Google "scraping websites in X".
Replace X with the name of a programming language. Although all
programming languages should (and in some logical sense must)
support web scraping, only few make it as easy as e.g. Python.

ghans
by ghans
Thu Jul 05, 2018 6:00 pm
Forum: Beginners
Topic: Detached IP Camera + Media Server = Possible?
Replies: 4
Views: 125

Re: Detached IP Camera + Media Server = Possible?

Make sure that the camera doesn't only work with Internet Explorer ... especially ActiveX should not be necessary for the stream to be displayed ....


ghans
by ghans
Thu Jul 05, 2018 5:41 pm
Forum: Beginners
Topic: Use QEMU to simulate raspberry pi, want to test DMA
Replies: 3
Views: 132

Re: Use QEMU to simulate raspberry pi, want to test DMA

"versatilepb" is NOT the same as "raspi2" or "raspi3" ;) Note that only rather recent QEMU versions support this ...

ghans
by ghans
Thu Jul 05, 2018 5:38 pm
Forum: Deutsch
Topic: udev Regel timeout
Replies: 8
Views: 219

Re: udev Regel timeout

Hmm. Keine Ahnung was los ist.

1) In beiden Skripten immer vollständige Pfade angeben anstatt PATH zu manipulieren ?
2) In beiden Skripten überall "bash" anstatt "sh" benutzen.
3) Im ersten Skript das "& disown" weglassen


ghans
by ghans
Thu Jul 05, 2018 3:20 pm
Forum: General discussion
Topic: Boot up sequence interrupted by a power loss
Replies: 6
Views: 215

Re: Boot up sequence interrupted by a power loss

Computers without "embedded-style" operating systems all have this problem. Raspbian is not an "embedded-style" Linux OS and also has this problem. The easiest way to improve this is to make a "readonly rootfs" with the help of "overlayfs" (which is how embedded-style OS seem to do it by default any...
by ghans
Thu Jul 05, 2018 3:05 pm
Forum: Troubleshooting
Topic: No Interfacing Options?
Replies: 4
Views: 116

Re: No Interfacing Options?

Code: Select all

cat /boot/issue.txt
ghans
by ghans
Wed Jul 04, 2018 3:29 pm
Forum: Other projects
Topic: looking for help to tweet screenshot of a .exe file
Replies: 9
Views: 314

Re: looking for help to tweet screenshot of a .exe file

Please state

1) which programming languages you know
2) which programming languages you want to use for this project

You are going to get confusing or WRONG advice without giving us those details.

ghans
by ghans
Wed Jul 04, 2018 2:53 pm
Forum: Deutsch
Topic: Raspbian sd-karte zu einem eigenem (möglichst kleinem) Image "klonen" [gelöst]
Replies: 12
Views: 334

Re: Raspbian sd-karte zu einem eigenem (möglichst kleinem) Image "klonen"

Nein. Neuere Pis können über das Netzwerk booten, aber ext4, NTFS und BTRFS sind unsupported. Ich glaube selbst exFAT funktioniert nicht.

ghans
by ghans
Wed Jul 04, 2018 1:31 pm
Forum: Deutsch
Topic: Raspbian sd-karte zu einem eigenem (möglichst kleinem) Image "klonen" [gelöst]
Replies: 12
Views: 334

Re: Raspbian sd-karte zu einem eigenem (möglichst kleinem) Image "klonen"

Der Raspberry Pi hat keinen Bootsector im x86-Sinn. Er sucht auf der ersten FAT-Partition eine Datei namens bootcode.bin und führt diese aus. Eine Alternative zu meinem ersten Vorschlag ist das Image zu mounten und dann mit gparted zu bearbeiten. Danach alles unmounten und gefahrlos mit "truncate" d...
by ghans
Wed Jul 04, 2018 8:38 am
Forum: Deutsch
Topic: Raspbian sd-karte zu einem eigenem (möglichst kleinem) Image "klonen" [gelöst]
Replies: 12
Views: 334

Re: Raspbian sd-karte zu einem eigenem (möglichst kleinem) Image "klonen"

Ist dein Raspberry Pi eingeschaltet ? Wenn ja, stecke einen USB-Kartenleser in deinen Pi und die zweite Karte hinein. Suche im "Startmenü" nach "SD Card Copier". Das Programm umschifft all diese Probleme relativ simpel.

ghans
by ghans
Tue Jul 03, 2018 1:47 pm
Forum: General discussion
Topic: Multiple Frame buffer beta testers wanted
Replies: 47
Views: 1784

Re: Multiple Frame buffer beta testers wanted

This is only for the official touchscreen or displays using DPI on the GPIO. All other screens should always have worked in multi-head scenarios already, as long the proper display driver was loaded via devicetree overlays.

ghans
by ghans
Tue Jul 03, 2018 5:21 am
Forum: Raspbian
Topic: simplified steps to login as root / set root password.
Replies: 6
Views: 326

Re: simplified steps to login as root / set root password.

If you are on the command-line, try using the TAB key more often. Bash has auto-completion.

ghans
by ghans
Mon Jul 02, 2018 9:39 am
Forum: Deutsch
Topic: udev Regel timeout
Replies: 8
Views: 219

Re: udev Regel timeout

Alternativ zwei Skripte schreiben. Das erste trägt das zweite mit "at" als "geplante Aufgabe" ein. Selbst wenn udev das erste Skript nachträglich abschießt, wird "at" das zweite am geplanten Zeitpunkt ausführen. Am sinnvollsten ist wohl der Zeitpunkt "now".

ghans
by ghans
Sun Jul 01, 2018 10:12 am
Forum: Beginners
Topic: Please Help: Error while Installing the printer driver
Replies: 8
Views: 198

Re: Please Help: Error while Installing the printer driver

Those are warnings, not errors. Try

Code: Select all

sudo make install
It should just work.

ghans
by ghans
Sun Jul 01, 2018 10:08 am
Forum: Beginners
Topic: Detached IP Camera + Media Server = Possible?
Replies: 4
Views: 125

Re: Detached IP Camera + Media Server = Possible?

Post a link to the datasheet of your camera. A link to the manual would be good too.

ghans
by ghans
Sun Jul 01, 2018 8:22 am
Forum: General discussion
Topic: Is it possible to receive multiple messages via multiple SMS cards
Replies: 8
Views: 251

Re: Is it possible(new user)

Do you want to build

1) an EMail-to-SMS gateway
2) a SMS-to-EMail gateway
3) a jury-rigged 2 Factor authentication infrastructure

or something completely different ?

ghans
by ghans
Fri Jun 29, 2018 4:45 am
Forum: General discussion
Topic: can i shift program from raspberry pi 3 B to pi zero w?
Replies: 9
Views: 288

Re: can i shift program from raspberry pi 3 B to pi zero w?

If you use OpenGL ES for 3D and Openmax IL for video with the bcrm* libraries your software will have hardware acceleration on any Raspberry Pi produced. Qt5 is doing this since June 2012 with stunning results. Most Linux 3D software uses regular OpenGL via GLX/Mesa3D. The new driver which was writt...

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