5
votes
gstreamer video output on pi framebuffer without X
The one way you can output directly to the frame buffer is using fbdevsink, e.g.:
gst-launch-1.0 -v videotestsrc ! fbdevsink
The fbdevsink can be found in the gstreamer1.0-plugins-bad package.
- 151
4
votes
Prevent text console from periodically switching to boot screen
In thanks to Gerard's answer I was able to find a comment in that bug chain with a successful workaround to this problem, it took me some time to find so I will provide it here for anyone else ...
- 41
3
votes
Problem using vlc without X
I have found out that in addition to vlc-bin, installing vlc-plugin-base (~500 Mbyte) solves my problem. Writing cvlc /opt/vc/src/hello_pi/hello_video/test.h264 now displays the video.
But isn't there ...
3
votes
How to use I2C SSD1306 as Framebuffer
A device tree overlay which allows the use of an ssd1306 via i2c was merged into the Raspberry Pi OS (Raspbian) kernel in early 2019 (https://github.com/raspberrypi/firmware/issues/1098).
To use this, ...
- 51
3
votes
Accepted
Force a 16bit framebuffer when using a DPI display
Framebuffer color depth can be changed by fbset
fbset -fb /dev/fb0 -depth 16 ...
Writing the desired framebuffer configuration in /etc/fb.modes could help making the change permanent, but I never ...
- 28.2k
2
votes
Accepted
fbi application frozen and/or raspi frozen?
The Pi has 3 "components" the CPU, GPIO and Video Core which are relatively independent.
As you might guess the Video Core is responsible for display, and will continue to display the contents of the ...
- 61.5k
2
votes
Pi4 start X server only on one HDMI output
Allocate two framebuffers from config.txt
max_framebuffers=2
Tell Xorg to use only one screen: create xorg.conf with sudo xorg -configure and edit it to keep only the first device. If Xorg is not ...
- 28.2k
2
votes
How can I write an image to the RPI4 framebuffer in Raspbian Lite?
I understand ImageMagic's convert doesn't support RGB565, which is the typical 16-bit framebuffer format. It's possible to perform the conversion with scripts, as the linked thread suggests, but those ...
- 28.2k
2
votes
No video output running on QEMU
Currently (march 2022), QEMU's framebuffer isn't compatible with the most recent RPi linux kernel, so the solution right now is to just use an older version of raspios. Buster with linux-4.19 works ...
- 21
2
votes
Accepted
Showing an image on HDMI (DSI, HDMI screens connected)
I found a well structured program in git hub :
https://github.com/AndrewFromMelbourne/raspidmx
which handles my task. to open a .png file and show it on the HDMI display while DSI screen is ...
- 43
1
vote
1
vote
Raspberry Pi + LED Video Processor and resolution issues
I was able to make this work by manually tweaking the hdmi_timings in the end.
- 131
1
vote
Accepted
How to convert a Python / Kivy program from a Desktop Window to a stand-alone Raspberry Pi Kiosk
Kivy can use hardware accelerated libraries on PiOS Lite. Desktop / X is not necessary.
However, for the Pi4 you need to compile the SDL2 libraries from source. The version in the repos was not ...
- 3,559
1
vote
raspberry pi 4B: writing to screen buffer / framebuffer
Strictly speaking, no. The video output of the Pi is under control of the VideoCore, not the ARM CPU.
You can allocate a framebuffer and use low-level memory writes to fill it, but you'll still have ...
- 28.2k
1
vote
Accepted
Python pygame program won't run through SSH / Remote Desktop
"No protocol specified" is the error you get when you start the X server as user 1 (in your case: "pi") and then try to access it as another user (in your case: "root"). ...
- 28.2k
1
vote
Possible to measure time of HDMI output generation based on framebuffer copy?
T1 can be estimated reasonably well by toggling a GPIO pin.
T2 can be measured with an HDMI analyzer or a high-end oscilloscope. Don't expect this to be cheap.
I bet Broadcom have already measured ...
- 28.2k
1
vote
How to display graphical text without X using C?
I got 2D vector graphics library working, using it from C Language, currently with a 128x128 OLED display on a headless Raspberry Pi 3B, using the following recipe. Note: X-Windows (X11) is not ...
- 259
1
vote
Develop RPi framebuffer program on Linux laptop
You can try to use Debian Stretch with Raspberry Pi Desktop for PC and Mac. I don't know if it fit your needs, in particular accessing the hardware and framebuffer but I think it is worth to have a ...
- 42.6k
1
vote
What is the pixel format for Raspberry Pi framebuffer
Looks like the unsigned char pointer was actually casting to unsigned char and thus truncating the data to only 8 bits, 5 of which were blue, and 3 were least significant bits of green.
Fixed by ...
- 131
1
vote
Prevent text console from periodically switching to boot screen
According to this bug (https://bugzilla.redhat.com/show_bug.cgi?id=1387733) it could depend on your monitor and the resolution used. Try another monitor or a lower resolution.
- 461
1
vote
Is there a way to drive the display via HDMI from a systemd service
Have another program which runs on the user's account and is autostarted whenever the user logs in. That program waits for notifications from your background daemon received via a unix domain socket ...
- 1,728
1
vote
Conflicting dtoverlays and framebuffer
If you take a look at notro's fbtft documentation, specifically the the information about using your display as a Boot Console, there is some information about attaching displays to different ttys.
...
- 1,414
1
vote
Accepted
Using ffmpeg to capture whatever is being globally sent to video output (ie: hdmi output)
UV4L offers a driver named "raspidisp" that captures the screen and offers a /dev/video device for use with ffmpeg or avconv.
- 2,702
1
vote
3,5" Kuman display stops working after update/upgrade
This Config need to be use with ssh remote
Please Pay attentions xD
First of all install normal libray LCD-SHOW-XX-XX-XX.TAR.GZ
extract and find lcd35-show
and then run => ./lcd35-show
next
...
1
vote
3,5" Kuman display stops working after update/upgrade
unfortunatey the re-install you mentioned does not work since the kernel version seems not to be in the repository any more.
Since I noticed the issue afterwards the upgrade, I was in the same ...
- 11
1
vote
3,5" Kuman display stops working after update/upgrade
Same for me (I'm using the same display).
Solved it by re-installing and setting the packages raspberrypi-kernel and raspberrypi-bootloader to "hold":
sudo apt-mark hold raspberrypi-kernel ...
- 11
Only top scored, non community-wiki answers of a minimum length are eligible