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[Raspberry Pi] amendments to camera section #24

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[Raspberry Pi] amendments to camera section #24

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20 changes: 9 additions & 11 deletions Raspberry_Pi.md
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Original file line number Diff line number Diff line change
Expand Up @@ -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:

Expand All @@ -112,13 +114,15 @@ 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=
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)
Expand All @@ -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`:
Expand Down