說明: 使用到的 依賴包  

1. ffmpeg

sudo apt update 
sudo apt-get install ffmpeg

2. imagemagick (選裝)
(檢測圖像邊緣信息推斷清晰度,如果是簡單截取但個圖像幀=>用不到<=)

sudo apt-get install imagemagick

備注: 
指令及相關(guān)參數(shù)說明

#!/bin/bash

# 刪除指定目錄下已有的圖片
rm -f /data/hikuser/handler_video_to_picture/output*.jpg

# 檢查是否提供了視頻流 URL 參數(shù)
if [ "$#" -ne 1 ]; then
    echo "Usage: ${0##*/} <video_stream_url>"
    exit 1
fi

# 視頻流 URL
VIDEO_URL="$1"

# 檢查輸出目錄是否存在
if [ ! -d "/data/hikuser/handler_video_to_picture" ]; then
    echo "Directory /data/hikuser/handler_video_to_picture does not exist."
    exit 1
fi

# 執(zhí)行 ffmpeg 命令提取幀，每10幀選擇一幀, 一共提取5張
if ! ffmpeg -i "$VIDEO_URL" -vf "select='not(mod(n,10))'" -frames:v 5 -q:v 1 /data/hikuser/handler_video_to_picture/output_%03d.jpg; then
    echo "ffmpeg command failed."
    exit 1
fi

# 執(zhí)行檢測圖片清晰度的腳本
# if [ -f /data/hikuser/handler_video_to_picture/detect_sharpness.sh ]; then
#    /bin/bash /data/hikuser/handler_video_to_picture/detect_sharpness.sh
# else
#    echo "detect_sharpness.sh script not found!"
#    exit 1
# fi

#!/bin/bash

# 初始化最大邊緣值和最清晰的圖片變量
max_edge_value=0
sharpest_image=""

# 進(jìn)入圖片所在目錄
cd /data/hikuser/handler_video_to_picture || exit 1

# 遍歷每張圖片并計(jì)算邊緣值
for img in output_*.jpg; do
    # 計(jì)算圖片的邊緣檢測值
    edge_value=$(convert "$img" -edge 1 -format "%[mean]" info:)
    echo "$img 邊緣檢測值: $edge_value"
    
    # 比較邊緣值，保留最大值對應(yīng)的圖片
    if (( $(echo "$edge_value > $max_edge_value" | bc -l) )); then
        max_edge_value=$edge_value
        sharpest_image=$img
    fi
done

# 輸出最清晰的圖片
echo "最清晰的圖片是: $sharpest_image"

# 刪除其他圖片
for img in output_*.jpg; do
    if [ "$img" != "$sharpest_image" ]; then
        rm "$img"
    fi
done

# 將最清晰的圖片重命名為 output.jpg
mv "$sharpest_image" /data/hikuser/handler_video_to_picture/output.jpg

echo "已刪除其他圖片，保留最清晰的圖片: $sharpest_image"

#!/bin/bash

# 檢查是否提供了文件夾名稱參數(shù)
if [ "$#" -ne 1 ]; then
    echo "Usage: ${0##*/} <directory_name>"
    exit 1
fi

# 文件夾名稱
DIR_NAME="$1"

# 檢查文件夾是否存在
if [ -d "$DIR_NAME" ]; then
    echo "Directory '$DIR_NAME' already exists."
else
    # 創(chuàng)建文件夾
    mkdir -p "$DIR_NAME"
    if [ $? -eq 0 ]; then
        echo "Directory '$DIR_NAME' has been created."
    else
        echo "Failed to create directory '$DIR_NAME'."
        exit 1
    fi
fi