Mainline Hardware Encoding
Mainline Hardware Encoding of video can be achieved through the V4L2 user-space API, for which currently only GStreamer implements the required code.
SoC Support
The following table shows the current supported codecs for encoding for each SoC. Support for decoding is separate.
SoC Codec
|
RK3328 | RK3399 | RK3566 | RK3588 |
|---|---|---|---|---|
| JPEG | N/A | Yes | Yes | No |
| VP8 | N/A | No | No | No |
| H.264/AVC | No | No | No | No |
| H.265/HEVC | No | N/A | No | No |
Encoding With GStreamer
With GStreamer, in general, any V4L2 control can be set using the extra-controls=foo,name=value syntax after the encode pipeline stage identifier, where foo is any name you wish which GStreamer will promptly ignore, name is the name of the V4L2 control as shown by v4l2-ctl --list-ctrls (make sure to pick the right device with -d), and value is whatever value you want to set it to.
JPEG Encoding
This example converts an input MP4 file to an output MJPEG-inside-MKV file at JPEG quality 95, without any audio.
gst-launch-1.0 filesrc location=input.mp4 ! qtdemux name=demux demux.video_0 ! decodebin ! videoconvert ! v4l2jpegenc extra-controls=s,compression_quality=95 ! matroskamux ! filesink location=output.mkv