Linux上录屏

convert

#!/bin/bash

# 用于把录屏方案1输出的视频转换成录屏方案2

# Codec: h264_nvenc, High H264 profile and yuv420p pixel format

ffmpeg -i "$1" -c:a copy -c:v h264_nvenc -b:v 0 -profile:v high -pix_fmt yuv420p -rc-lookahead 20 "$2"

record-audio

#!/bin/bash

set -e

# if env "PAREC_DEVICE" not set, use default value "alsa_output.pci-0000_00_1f.3.analog-stereo.monitor"
if [ -z "$PAREC_DEVICE" ]; then
    echo 'PAREC_DEVICE not set, use default value "alsa_output.pci-0000_00_1f.3.analog-stereo.monitor"' >&2
    parec_device="alsa_output.pci-0000_00_1f.3.analog-stereo.monitor"
else
    parec_device="$PAREC_DEVICE"
fi

echo "$parec_device" >&2

parec --device="$parec_device" \
    --channels=2 \
    --rate=44100 \
    --format=s16le

record-video

#!/bin/bash

# get self filename
self_name="$(basename "$0")"

function print_help() {
    echo "Usage: $self_name [<option>]... [<output_file>]"
    echo "Options:"
    echo "  -h, --help                    Print this help"
    echo "  -a, --audio                   Record audio from sound card"
    echo "  -f, --framerate <framerate>   Set framerate (default: 30)"
    echo "  -s, --scheme <scheme>         Set scheme (default: 2)"
    echo
    echo "Methods:"
    echo "  1: cpu, libx264rgb, ultrafast preset, High 4:4:4 Predictive profile"
    echo "  2: gpu, h264_nvenc, High profile, yuv420p pixel format"
    exit 0
}

# loop through arguments, and check if -h or --help is presented
for arg in "$@"; do
    if [ "$arg" = "-h" ] || [ "$arg" = "--help" ]; then
        print_help
    fi
done

record_audio=0
framerate=30
scheme=2

# loop through all options
while [[ "$1" == -* ]]; do
    case "$1" in
    -a | --audio)
        record_audio=1
        shift
        ;;
    -f | --framerate)
        framerate="$2"
        shift 2
        ;;
    -s | --scheme)
        scheme="$2"
        shift 2
        ;;
    *)
        echo "Unknown option: $1"
        exit 1
        ;;
    esac
done

# set output_file from argument, and if not presented, use default
if [[ -z "$1" ]]; then
    output_file="$(date "+%Y-%m-%d_%H%M%S").mkv"
else
    output_file="$1"
fi

# if `framerate` is not an integer, print error
if ! [[ "$framerate" =~ ^[0-9]+$ ]]; then
    echo "Invalid framerate: $framerate"
    exit 1
fi

# if scheme is not 1 or 2, print error
if ! [[ "$scheme" =~ ^[1-2]$ ]]; then
    echo "Invalid scheme: $scheme"
    exit 1
fi

# if $DISPLAY is not set, print error
if [[ -z "$DISPLAY" ]]; then
    echo "\$DISPLAY env missing"
    exit 1
fi

# scheme 1 and don't record audio
if [[ "$scheme" == 1 && "$record_audio" == 0 ]]; then
    ffmpeg -f x11grab -framerate "$framerate" -i "$DISPLAY" \
        -c:v libx264rgb \
        -vf setpts=N/FR/TB -crf 0 \
        -preset ultrafast \
        "$output_file"
    exit 0
fi

# scheme 1 and record audio
if [[ "$scheme" == 1 && "$record_audio" == 1 ]]; then
    ./record-audio | ffmpeg -f x11grab -framerate "$framerate" -i "$DISPLAY" \
        -ar 44100 -ac 2 -f s16le -i pipe:0 \
        -c:v libx264rgb \
        -vf setpts=N/FR/TB -crf 0 \
        -preset ultrafast \
        -c:a libopus -b:a 96k \
        "$output_file"
    exit 0
fi

# scheme 2 and don't record audio
if [[ "$scheme" == 2 && "$record_audio" == 0 ]]; then
    ffmpeg -f x11grab -framerate "$framerate" -i "$DISPLAY" \
        -c:v hevc_nvenc \
        -b:v 0 \
        "$output_file"
    exit 0
fi

# scheme 2 and record audio
if [[ "$scheme" == 2 && "$record_audio" == 1 ]]; then
    ./record-audio | ffmpeg -f x11grab -framerate "$framerate" -i "$DISPLAY" \
        -ar 44100 -ac 2 -f s16le -i pipe:0 \
        -c:v hevc_nvenc \
        -b:v 0 \
        -c:a libopus -b:a 96k \
        "$output_file"
    exit 0
fi

Thanks to Copilot again.