AM62A7: How to set the bitrate for a H.265 stream?

Hi Bas,

Are you testing with 9.1 SDK released software?

I just ran these  pipelines on my AM62A board and I do see the difference in the files created.

gst-launch-1.0 -v v4l2src device=/dev/video-usb-cam0 num-buffers=100 ! \
'image/jpeg, width=640, height=480, framerate=30/1' ! jpegdec ! videoconvert ! \
v4l2h265enc ! filesink location=usb-default.264

gst-launch-1.0 -v v4l2src device=/dev/video-usb-cam0 num-buffers=100 ! \
'image/jpeg, width=640, height=480, framerate=30/1' ! jpegdec ! videoconvert ! \
v4l2h265enc extra-controls="controls, hevc_profile=1, video_bitrate=10000, hevc_level=3" ! \
filesink location=usb-profile-level-br.264

gst-launch-1.0 -v v4l2src device=/dev/video-usb-cam0 num-buffers=100 ! \
'image/jpeg, width=640, height=480, framerate=30/1' ! jpegdec ! videoconvert ! \
v4l2h265enc extra-controls="controls, hevc_profile=0, video_bitrate=100000, hevc_level=5" ! \
filesink location=usb-pr0-lvl5-b100000.264

Let me know if this helps.

Best Regards,

Suren

Hi Suren,

I am testing with SDK 9.1.0.7.

I am trying to compress a jpeg that's 3840x2160, and no matter the settings, I get the same(ish) size for the video file.

The picture I use:

The script I use is currently this (I've added your controls to it):

#!/bin/bash

INPUT="frame.jpg"
OUTPUT="output.jpg"
HEVC_PROFILE=0 # Main
HEVC_LEVEL=0
VIDEO_BITRATE=0

TEMP=$(getopt -o 'p:l:b:i:o:h' --long 'profile:,level:,bitrate:,input:,output:,help' -n '$0' -- "$@")

if [ $? -ne 0 ]; then
	echo 'Terminating...' >&2
	exit 1
fi

eval set -- "$TEMP"
unset TEMP

while true; do
	case "$1" in
		'-h'|'--help')
			echo 'Help'
			shift
			continue
		;;
		'-p'|'--profile')
			echo "HEVC Profile: '$2'"
			HEVC_PROFILE=$2
			shift 2
			continue
		;;
		'-l'|'--level')
			echo "HEVC Level: '$2'"
			HEVC_LEVEL=$2
			shift 2
			continue
		;;
		'-b'|'--bitrate')
			echo "Video Bitrate: '$2'"
			VIDEO_BITRATE=$2
			shift 2
			continue
		;;
		'-i'|'--input')
			echo "Input: '$2'"
			INPUT=$2
			shift 2
			continue
		;;
		'-o'|'--output')
			echo "Output: '$2'"
			OUTPUT=$2
			shift 2
			continue
		;;
		'--')
			shift
			break
		;;
		*)
			echo 'Internal error!' >&2
			exit 1
		;;
	esac
done

echo "Compressing $INPUT to p${HEVC_PROFILE}l${HEVC_LEVEL}b${VIDEO_BITRATE}.h265:"
gst-launch-1.0 multifilesrc location="$INPUT" start-index=0 stop-index=0 caps="image/jpeg,framerate=1/1" loop=0 \
  ! jpegparse \
  ! jpegdec \
  ! 'video/x-raw,format=I420' \
  ! videoconvert \
  ! v4l2h265enc extra-controls="controls, hevc_profile=$HEVC_PROFILE, hevc_level=$HEVC_LEVEL, video_bitrate=$VIDEO_BITRATE" \
  ! filesink location=p${HEVC_PROFILE}l${HEVC_LEVEL}b${VIDEO_BITRATE}.h265
echo "Done."

echo "Decompressing p${HEVC_PROFILE}l${HEVC_LEVEL}b${VIDEO_BITRATE}.h265 to $OUTPUT:"
gst-launch-1.0 filesrc location=p${HEVC_PROFILE}l${HEVC_LEVEL}b${VIDEO_BITRATE}.h265 \
  ! h265parse \
  ! v4l2h265dec \
  ! jpegenc \
  ! multifilesink location="$OUTPUT"
echo "Done."

The .h265 file used as an intermediary doesn't really change size (I've seen a difference of 2 bytes, but that's it). I'm not sure if this is normal or not.

I've used several parameters:

• no parameters to the script
• -p0 -l1 -b10000
• -p0 -l3 -b10000
• -p1 -l5 -b1000
• -p1 -l5 -b10000
• -p1 -l5 -b100000

They all generate a .h265 file with a size of around 338058(+/- 2).

-rw-r--r-- 1 root root  338060 May 10 21:44  p0l0b0.h265
-rw-r--r-- 1 root root  338060 May 10 21:44  p0l1b10000.h265
-rw-r--r-- 1 root root  338058 May 10 21:25  p0l3b10000.h265
-rw-r--r-- 1 root root  338058 May 10 21:41  p1l5b1000.h265
-rw-r--r-- 1 root root  338058 May 10 21:41  p1l5b10000.h265
-rw-r--r-- 1 root root  338058 May 10 21:44  p1l5b100000.h265

The end-goal is a 6 Mbps stream coming from a 4K (3840x2160 30 fps) video source. I'm currently trying to find the parameters that allow me to do that.

Regards,

Bas Vermeulen

Hi Suren,

frame_level_rate_control=1 makes a big difference (but can't be used when video_bitrate=0, which is the default).

I've updated my script to manage that, it now writes a .h265 stream and the individual frames as jpg.

#!/bin/bash

INPUT="frame.jpg"
OUTPUT="output"
HEVC_PROFILE="main"
HEVC_LEVEL="1"
VIDEO_BITRATE=0
FRAME_RATE_CONTROL=0

TEMP=$(getopt -o 'p:l:b:i:o:h' --long 'profile:,level:,bitrate:,input:,output:,help' -n '$0' -- "$@")

if [ $? -ne 0 ]; then
	echo 'Terminating...' >&2
	exit 1
fi

eval set -- "$TEMP"
unset TEMP

while true; do
	case "$1" in
		'-h'|'--help')
			echo "$0 - H.265 compress a JPEG file into a one second stream"
			echo "Parameters:"
			echo "  -p main|main-still-picture|main-10 (HEVC Profile)"
			echo "  -l 1|2|2.1|3|3.1|4|4.1|5|5.1 (HEVC Level)"
			echo "  -b 0..700000000 (Video Bitrate)"
			echo "  -i input.jpg (Input JPEG file)"
			echo "  -o output (Base name of output files - gets converted to output%03d.jpg)"
			echo "  -h This help"
			exit 0
			shift
			continue
		;;
		'-p'|'--profile')
			case "$2" in
				'main'|'Main'|'0')
					HEVC_PROFILE="main"
					;;
				'main-still-picture'|'1')
					HEVC_PROFILE="main-still-picture"
					;;
				'main-10'|'2')
					HEVC_PROFILE="main-10"
					;;
				*)
					HEVC_PROFILE="main"
					;;
			esac
			echo "HEVC Profile: '$HEVC_PROFILE'"
			shift 2
			continue
		;;
		'-l'|'--level')
			case "$2" in
				'1'|'2'|'2.1'|'3'|'3.1'|'4'|'4.1'|'5'|'5.1')
					HEVC_LEVEL="$2"
					;;
				*)
					HEVC_LEVEL="1"
					;;
			esac
			echo "HEVC Level: '$HEVC_LEVEL'"
			shift 2
			continue
		;;
		'-b'|'--bitrate')
			echo "Video Bitrate: '$2'"
			VIDEO_BITRATE=$2
			if [ $VIDEO_BITRATE -gt 0 ]; then
				FRAME_RATE_CONTROL=1
			fi
			shift 2
			continue
		;;
		'-i'|'--input')
			echo "Input: '$2'"
			INPUT=$2
			shift 2
			continue
		;;
		'-o'|'--output')
			echo "Output: '$2'"
			OUTPUT=$2
			shift 2
			continue
		;;
		'--')
			shift
			break
		;;
		*)
			echo 'Internal error!' >&2
			exit 1
		;;
	esac
done

echo -n "Compressing $INPUT to $OUTPUT:"
gst-launch-1.0 -q multifilesrc location="$INPUT" start-index=0 stop-index=29 caps="image/jpeg,framerate=30/1" loop=0 \
  ! jpegparse \
  ! jpegdec \
  ! 'video/x-raw,format=I420' \
  ! videoconvert \
  ! v4l2h265enc extra-controls="controls, prepend_sps_and_pps_to_idr=1, frame_level_rate_control_enable=${FRAME_RATE_CONTROL}, video_gop_size=5, video_bitrate_mode=0, video_bitrate=$VIDEO_BITRATE" \
  ! "video/x-h265, profile=(string)${HEVC_PROFILE}, level=(string)${HEVC_LEVEL}" \
  ! tee name=tee0 \
  ! h265parse \
  ! v4l2h265dec \
  ! jpegenc \
  ! multifilesink location="${OUTPUT}-p${HEVC_PROFILE}l${HEVC_LEVEL}b${VIDEO_BITRATE}.%03d.jpg" \
  tee0. \
  ! filesink location="${OUTPUT}-p${HEVC_PROFILE}l${HEVC_LEVEL}b${VIDEO_BITRATE}.h265"
echo "Done."

The streams now look like this (the ones with b0 have frame_level_rate_control=0):

-rw-r--r-- 1 root root 2032530 Jan 31 06:22 onsemi-pmainl1b0.h265
-rw-r--r-- 1 root root  117588 Jan 31 06:20 onsemi-pmainl1b6000.h265
-rw-r--r-- 1 root root 2032530 Jan 31 06:13 onsemi-pmainl3b0.h265
-rw-r--r-- 1 root root  117588 Jan 31 06:08 onsemi-pmainl3b100000.h265
-rw-r--r-- 1 root root  117588 Jan 31 06:07 onsemi-pmainl3b6000.h265
-rw-r--r-- 1 root root 3434826 Jan 31 06:26 sony-pmainl1b0.h265
-rw-r--r-- 1 root root  148836 Jan 31 06:24 sony-pmainl1b6000.h265

With frame_level_rate_control=1 the stream is a lot smaller, thank you.

I have one remaining question, what is the unit of the video_bitrate setting? At the moment I'm guessing kilobit/s, but I could be mistaken.

Regards,

Bas Vermeulen