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docs: add info for raspberrypi distro vlc

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Explains that PREFERRED_PROVIDER_ffmpeg/vlc
can be used to select an implementation of ffmpeg
or vlc. Also adds information on how vlc mmal_vout
plugin could be utilized. As well as how to expose
rpidistro-vlc.

Signed-off-by: Vincent Davis Jr <vince@underview.tech>
This commit is contained in:
Vincent Davis Jr 2022-05-11 00:28:24 -05:00 committed by Andrei Gherzan
parent 1b598573be
commit 4b9c0dd543
1 changed files with 31 additions and 0 deletions
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docs/extra-build-config.md
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@ -430,3 +430,34 @@ the device tree is properly tweaked. Also, mind the runtime components that
take advantage of your RTC device. You can do that by checking what is take advantage of your RTC device. You can do that by checking what is
included/configured in the build system based on the inclusion of `rtc` in included/configured in the build system based on the inclusion of `rtc` in
`MACHINE_FEATURES`. `MACHINE_FEATURES`.
## Raspberry Pi Distro VLC
To enable Raspberry Pi Distro VLC, the `meta-openembedded/meta-multimedia` layer must be
included in your `bblayers.conf`.
VLC does not support HW accelerated video decode through MMAL on a 64-bit OS.
See:
* <https://forums.raspberrypi.com/viewtopic.php?t=275370>
* <https://forums.raspberrypi.com/viewtopic.php?t=325218#p1946169>
MMAL is not enabled by default. To enable it add
DISABLE_VC4GRAPHICS = "1"
to `local.conf`. Adding `vlc` to `IMAGE_INSTALL` will then default to building the Raspberry
Pi's Distro implementation of VLC with HW accelerated video decode through MMAL into the system
image. It also defaults to building VLC with Raspberry PI's Distro implementation of ffmpeg. The
oe-core implementation of ffmpeg and the meta-openembedded/meta-multimedia implementation of VLC
can however be selected via:
PREFERRED_PROVIDER_ffmpeg = "ffmpeg"
PREFERRED_PROVIDER_vlc = "vlc"
Usage example: Start VLC with mmal_vout plugin and without an active display server.
DISPLAYNUM=$(tvservice -l | tail -c 2)
MMAL_DISPLAY=$(expr $DISPLAYNUM + 1)
VLC_SETTINGS="-I dummy --vout=mmal_vout --mmal-resize --mmal-display hdmi-$MMAL_DISPLAY --no-dbus"
cvlc $VLC_SETTINGS <video/playlist>