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August 31, 2020 14:07
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This is a simple script that uses vaapi hardware acceleration to decode and encode videos.
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| #!/bin/bash | |
| # Usage function, displays valid arguments | |
| usage() { | |
| echo "Usage: $(basename ${0}) [arguments] inputfile" 1>&2 | |
| echo " -q qp, defaults to 18 for near lossless quality, higher value = lower quality." 1>&2 | |
| echo -e "\nExample: $(basename ${0}) -q 22" 1>&2 | |
| exit 1 | |
| } | |
| # Default variables | |
| qp=18 | |
| # getopts to process the command line arguments | |
| while getopts ":q:p:" opt; do | |
| case "${opt}" in | |
| q) qp=${OPTARG};; | |
| *) usage;; | |
| esac | |
| done | |
| # shift out the arguments already processed with getopts | |
| shift "$((OPTIND - 1))" | |
| if (( $# == 0 )); then | |
| printf >&2 'Missing input file\n' | |
| usage >&2 | |
| fi | |
| # set input variable to the first option after the arguments | |
| input="$1" | |
| # Extract filename from input file without the extension | |
| filename=${input%.*} | |
| title=${1##*/} | |
| echo "${filename} (qp${qp}).mkv" | |
| ffmpeg -hide_banner -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i "${input}" -map 0:v? -map 0:a? -map 0:s? -map 0:d? -map 0:t? -vf 'scale_vaapi=format=p010le' -c:v hevc_vaapi -qp ${qp} -profile:v main10 -max_muxing_queue_size 1024 -c:a copy -c:s copy -y "${filename} (qp${qp}) (recode).mkv" | |
| RESULT=$? | |
| if [ $RESULT -eq 0 ]; then | |
| mkvmerge --output "${filename} (qp${qp}).mkv" "${filename} (qp${qp}) (recode).mkv" --title "${filename}" | |
| RESULT=$? | |
| else | |
| echo "ERROR: ffmpeg failed" | |
| fi | |
| if [ $RESULT -eq 0 ]; then | |
| rm -rf "${filename} (qp${qp}) (recode).mkv" | |
| RESULT=$? | |
| fi |
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Tested on a Linux box running Fedora 32 with ffmpeg 4.2.4 from rpmfusion.
CPU is an Intel 10th Gen G6400.
4K HEVC 10bit HDR to 4K HEVC 10bit HDR = 14fps
1080P H264 to 1080P HEVC 10bit = 55fps
During transcodes CPU usage is ~9%
intel-gpu-top:
Render/3D/0 usage is 80-85%
Video/0 usage is 50-80%
VideoEnhance/0 usage is 6-10%