by rigaya
This software is meant to investigate performance and image quality of hw encoder on rockchip SoCs, which is used on SBCs such as Orange Pi, Nano Pi, and Radxa ROCK.
Example of 1080p transcoding using hw encoder and decoder in ROCK 5B (RK3588 SoC).
Install instructions for Linux.
Debian/Ubuntu It may be possible to run on other distributions (not tested).
Option list and details of rkmppenc
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
Radxa ROCK 5B (RK3588) HDMI In uses v4l2 multi-planar API, and does not respond to some v4l2 API queries. Therefore, it cannot be captured by ffmpeg 6.0.
rkmppenc uses ffmpeg with modification to support v4l2 multi-planar API, and workarounds to avoid errors. For example, HDMI In can be captured by following command line.
# video settings
V4L2_DV_TIMINGS_IDX=19
v4l2-ctl --set-dv-bt-timings index=${V4L2_DV_TIMINGS_IDX}
# index from v4l2-ctl --list-dv-timings
# Rock 5B (RK3588) list
# 10 1920x1080 30fps
# 14 1920x1080 60fps
# 17 3840x2160 30fps
# 19 3840x2160 60fps
# auto select hdmiin auto
ALSA_DEVICE_ID=`arecord -l | grep rockchiphdmiin | sed -e 's/^card \([0-9]\+\).*/\1/g'`
echo ALSA_DEVICE_ID=${ALSA_DEVICE_ID}
# add --input-analyze and --input-probesize to minimize startup latency
rkmppenc --input-format v4l2 -i /dev/video0 \
--input-analyze 0.2 --input-probesize 10000 \
--input-option channel:0 --input-option ignore_input_error:1 --input-option ts:abs \
--audio-source "hw:${ALSA_DEVICE_ID}:format=alsa/codec=aac;enc_prm=aac_coder=twoloop;bitrate=192" \
-o out.ts
To change input settings v4l2-ctl is required.
sudo apt install v4l-utils
We can check the supported input resolution and fps by v4l2-ctl --list-dv-timings
. The run v4l2-ctl --set-dv-bt-timings index=<n>
with the index.
Device ID can be checked using arecord -l
.
To use alsa hw, user needs to be added to "audio" group.
sudo gpasswd -a `id -u -n` audio
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