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by ghans
Sat Nov 30, 2019 9:20 am
Forum: Graphics, sound and multimedia
Topic: Record video on pi
Replies: 8
Views: 306

Re: Record video on pi

Use the "signal" mode of raspistill. You can send an "UNIX signal" to raspistill and it will toggle between recording/paused. Search for "signal" on the raspistill documentation page.

ghans
by ghans
Sat Nov 16, 2019 10:18 am
Forum: Advanced users
Topic: How to hw-disable the Raspbery Pi-4 Wlan-/Sd-Card Controller CYW 43455 (aka BCM43438)
Replies: 29
Views: 1135

Re: How to hw-disable the Raspbery Pi-4 Wlan-/Sd-Card Controller CYW 43455 (aka BCM43438)

No, the WiFi chip is not acting as an SD card controller on any Raspberry Pi. All Raspberries habe two SD card controllers, and on the models with WiFi one is used to control the WiFi chip, while the other controls the SD Card.

ghans
by ghans
Fri Nov 15, 2019 1:09 pm
Forum: Troubleshooting
Topic: RAID5: Remove all drives prevents boot
Replies: 6
Views: 222

Re: RAID5: Remove all drives prevents boot

Try adding the "nofail" option to your md entry in the fstab. systemd hard-fails the boot process if drives are missing by default.
Are you using an initrd or initramfs ?

ghans
by ghans
Tue Oct 22, 2019 5:25 pm
Forum: Graphics, sound and multimedia
Topic: Stream video through radio system
Replies: 2
Views: 1408

Re: Stream video through radio system

Post a link to the datasheet and product page of your "radio module". Nobody can help you properly otherwise.

ghans
by ghans
Sun Oct 13, 2019 10:52 am
Forum: Beginners
Topic: multiple cameras?
Replies: 6
Views: 519

Re: multiple cameras?

No, you will need 4 cameras AND 4 Raspberries for true simultaneous operation.

ghans
by ghans
Tue Oct 08, 2019 2:25 pm
Forum: Media centres
Topic: Raspberry Pi as HDMI wireless transmitter/receiver?
Replies: 15
Views: 2203

Re: Raspberry Pi as HDMI wireless transmitter/receiver?

The HDMI ports on any Raspberry Pi are output only.

ghans
by ghans
Sun Sep 01, 2019 6:46 pm
Forum: General programming discussion
Topic: Raspberry pi sound processor
Replies: 3
Views: 605

Re: Raspberry pi sound processor

Can you draw a picture/flowchart of the final process (including eventual D-A and A-D conversions) ? I have some ideas, but we might not be talking about the same thing.

ghans
by ghans
Sat Aug 31, 2019 7:58 am
Forum: General discussion
Topic: Can Raspberry Pi 4 play HEVC 1080p videos?
Replies: 11
Views: 8624

Re: Can Raspberry Pi 4 play HEVC 1080p videos?

LibreELEC is a Linux-based OS which solely runs the media center software "Kodi".
It is not a general-purpose operating system (no package management, for example).

ghans
by ghans
Wed Aug 28, 2019 1:08 pm
Forum: Deutsch
Topic: Sensordaten parallel abfragen
Replies: 4
Views: 772

Re: Sensordaten parallel abfragen

Ehrlich gesagt solltest du gleich deinen Code posten, alles andere wird Glaskugel-Lesen bleiben.

ghans
by ghans
Tue Aug 20, 2019 12:50 pm
Forum: Beginners
Topic: Looking for advice on the feasibility of a project
Replies: 5
Views: 343

Re: Looking for advice on the feasibility of a project

Do you have software developers on your team ? This might be possible without developers, but i would doubt it would be a sensible use of your (non-developer ?) teams time or resources. The easiest solution which would not need developer involvement would be trying to get FreedomBox or PirateBox run...
by ghans
Thu Aug 15, 2019 7:30 pm
Forum: Deutsch
Topic: CSI Interface
Replies: 7
Views: 1851

Re: CSI Interface

Ja, aber dieser Standard operiert auf einem sehr niedrigen Abstraktionsniveau, Plug-and-Play ist nicht vorgesehen. Schon gar nicht auf Software-Ebene. Ist ein Ding von der Industrie für die Industrie, Consumer hätten ihn nie zu Gesicht bekommen sollen. Vergleiche DSI (Display Serial Port) und HDMI (...
by ghans
Thu Aug 15, 2019 7:22 pm
Forum: Deutsch
Topic: CSI Interface
Replies: 7
Views: 1851

Re: CSI Interface

Der Pi nur unterstützt nur Kameramodule der Foundation. Drittmodule werden von der closed source GPU-Firmware nicht unterstützt, noch enthält sie das jeweils notwendige Grob-und-Feintuning der ISP-Pipeline.

ghans
by ghans
Tue Aug 06, 2019 5:39 pm
Forum: Troubleshooting
Topic: Reading data from USB microphone in C/C++
Replies: 2
Views: 277

Re: Reading data from USB microphone in C/C++

As long as you are using Linux, you should read up on ALSA. It is the foundation on which advanced solutions like PulseAudio and JACK are built. It might be sensible to bypass those.

ghans
by ghans
Tue Aug 06, 2019 5:33 pm
Forum: General discussion
Topic: May I use the RUN pin holes on Raspberry pi 3 like on/off, putting a switch?
Replies: 3
Views: 374

Re: May I use the RUN pin holes on Raspberry pi 3 like on/off, putting a switch?

Only if you are fine with a forceful reset and data loss or even SD card corruption.

ghans
by ghans
Tue Jul 16, 2019 5:28 am
Forum: Beginners
Topic: Do I HAVE to use LibreOffice?
Replies: 14
Views: 1322

Re: Do I HAVE to use LibreOffice?

Did you install LibreOffice from the "app store" (package manager) ? Using package management makes installing software much safer and convenient, and also takes the Pis ARM CPU into account. The package manager on Raspbian is called APT. Incidentally, Ubuntu uses the same system because it is a des...
by ghans
Mon Jul 15, 2019 5:03 am
Forum: Bare metal, Assembly language
Topic: Kernel switcher... kernel?
Replies: 4
Views: 1383

Re: Kernel switcher... kernel?

The Raspberry Pi does not support UEFI out-of-the-box. What people (or companies like Microsoft and SuSE) have been doing is to replace the file kernel.img with an (U)EFI implementation (either TianoCore or uboot + EFI emulation patches). It seems to work well enough. Obviously, this adds another st...
by ghans
Sun Jul 14, 2019 9:04 am
Forum: Graphics, sound and multimedia
Topic: Raspberry As Audio Output Device
Replies: 24
Views: 3770

Re: Raspberry As Audio Output Device

The Raspberry Pi can output audio easily over 3.5mm line-level jack and HDMI. If you want audiophile quality though, you should avoid the default analog output.

ghans
by ghans
Thu Jul 11, 2019 5:26 am
Forum: Deutsch
Topic: Einige USB-Typ-C-Ladegeräte erkennen Raspberry Pi 4 nicht
Replies: 3
Views: 583

Re: Einige USB-Typ-C-Ladegeräte erkennen Raspberry Pi 4 nicht

Nein. Es ist eher, dass standardkonforme Netzteile anderer Hersteller nicht funktionieren.

ghans
by ghans
Tue Jul 09, 2019 3:56 pm
Forum: General discussion
Topic: RPi2 v1.1 vs RPi2 v1.2 Differences
Replies: 5
Views: 408

Re: RPi2 v1.1 vs RPi2 v1.2 Differences

The Raspberry Pi 2B v1.1 uses a BCM2836 System-on-a-Chip (ARM Cortex-A7/ARMv7). The Raspberry Pi 2B v1.2 uses a BCM2837 System-on-a-Chip (ARM Cortex-A53/ ARMv8-A). Thanks to Raspbian, the difference is made irrelevant in practice. Also the Raspberry Pi2 version 1.2 was underclocked in comparison to ...
by ghans
Wed Jun 26, 2019 4:30 pm
Forum: Deutsch
Topic: Backup Raspberry SD Karte
Replies: 10
Views: 1106

Re: Backup Raspberry SD Karte

Wenn das NAS Windows-Freigaben untersützt kannst du sie hinzufügen, "mounten".
Dann kannst du direkt auf das NAS schreiben und sparst dir das Zwischenpuffern auf SD-Karte (50 % Zeitersparnis).

ghans
by ghans
Tue Jun 25, 2019 5:08 am
Forum: Graphics, sound and multimedia
Topic: [Advice needed] live HDMI in + dynamic text => HDMI out, w/textual overlay
Replies: 5
Views: 685

Re: [Advice needed] live HDMI in + dynamic text => HDMI out, w/textual overlay

How much latency is acceptable to your buddys father ? 400 ms ? 100 ms ? Less ?

ghans
by ghans
Sat Jun 22, 2019 6:35 am
Forum: Deutsch
Topic: Backup Raspberry SD Karte
Replies: 10
Views: 1106

Re: Backup Raspberry SD Karte

Warum nicht gleich rsync verwenden ? Vorrausgesetzt, das NAS unterstützt dies (d.h. es läuft ein frei zugängliches Linux auf dem NAS)

ghans
by ghans
Fri Jun 14, 2019 4:02 pm
Forum: Beginners
Topic: How would I only boot into one program and not a full blown OS
Replies: 13
Views: 1017

Re: How would I only boot into one program and not a full blown OS

The startup manager on Raspbian is called systemd. You probably want to write a "systemd unit" file to start your program in a fast yet controlled manner (after network is up etc.)

ghans

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