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fix code listing formatting for camera section

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clarify camera-related boot options

bcm2835-v4l2 module is loaded automatically on boot
This commit is contained in:
goekce 2020-11-08 16:10:17 +01:00
parent 0a6de3656d
commit 3ed646dd8e
1 changed files with 9 additions and 11 deletions

20
Raspberry_Pi.md
View file

@ -87,20 +87,22 @@ which contains options for non-NTSC outputs.
## Camera
The commands for the camera module are included as part of the raspberrypi-firmware package:
```
$ /opt/vc/bin/raspistill
$ /opt/vc/bin/raspivid
```
Append to `/boot/config.txt`:
According to the [boot options documentation](https://www.raspberrypi.org/documentation/configuration/config-txt/boot.md) `start_x=1` loads the relevant Videocore firmware for camera operation. Additionally more GPU memory is required for compressing the camera data according to [Raspberry Pi forum](https://www.raspberrypi.org/forums/viewtopic.php?t=234778#p1436166). Append to `/boot/config.txt`:
```
gpu_mem=128
start_file=start_x.elf
fixup_file=fixup_x.dat
start_x=1
```
Optionally
disable_camera_led=1
Optionally append the line `disable_camera_led=1` if you have RPi camera v1.
After boot you should see `/dev/video0`, which will be used by camera applications and additional `/dev/video1*` devices, [which are memory to memory (M2M) devices for the video decoder, encoder, and ISP](https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=62364&p=1527503#p1527508).
The following is a common error:
@ -112,6 +114,7 @@ mmal: Failed to run camera app. Please check for firmware updates
```
which can be corrected by setting these values in `/boot/config.txt`:
```
cma_lwm=
cma_hwm=
@ -119,6 +122,7 @@ cma_offline_start=
```
Another common error:
```
mmal: mmal_vc_component_create: failed to create component 'vc.ril.camera' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component 'vc.ril.camera' (1)
@ -131,12 +135,6 @@ can be corrected by adding the following line to `/etc/modprobe.d/blacklist.conf
blacklist i2c_bcm2708
In order to use standard applications (those that look for `/dev/video0`) the
V4L2 driver must be loaded. This can be done automatically at boot by creating
an autoload file, `/etc/modules-load.d/rpi-camera.conf`:
bcm2835-v4l2
The V4L2 driver by default only allows video recording up to 1280x720, else it
glues together consecutive still screens resulting in videos of 4 fps or lower.
Adding the following options removes this limitation, `/etc/modprobe.d/rpi-camera.conf`: