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2026-06-18

提取关键帧 - ExtractKeyFrames ​

函数简介 ​

提取关键帧（基于场景变化检测）。

接口名称 ​

ExtractKeyFrames

DLL调用 ​

c
int32_t ExtractKeyFrames(int64_t instance, int64_t videoHandle, double threshold, int32_t maxFrames, string outputDir, string imageFormat);

参数说明 ​

参数名类型说明
instance长整数型OLAPlug对象的指针，由 CreateCOLAPlugInterFace 接口生成。
videoHandle长整数型视频句柄。
threshold双精度浮点数场景变化阈值（0-1）。
maxFrames整数型最大提取帧数（0表示不限制）。
outputDir字符串输出目录。
imageFormat字符串图像格式（"png"、"jpg"等）。

示例 ​

SDK 调用 ​

cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
int ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png");
csharp
using OLAPlug;

var ola = new OLAPlugServer();
int ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png");
python
from OLAPlugServer import OLAPlugServer

ola = OLAPlugServer()
ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png")
java
import com.olaplug.OLAPlugServer;

OLAPlugServer ola = new OLAPlugServer();
int ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png");
cpp
var ola = com("OlaPlug.OlaSoft")
var ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png")
vbscript
Set ola = CreateObject("OlaPlug.OlaSoft")
ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png")
text
.局部变量 ola, OLAPlug
ola.创建 ()
ret ＝ ola.ExtractKeyFrames(0, 1.0, 0, “value”, “png”)
aardio
import OLAPlugServer;
var ola = OLAPlugServer();
var ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png");
text
变量 ola <类型 = OLAPlugServer>
ola = 新建 OLAPlugServer
整数 ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png")
cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
int32_t ret = ola.ExtractKeyFrames(0, 1.0, 0, "value", "png");

原生 DLL 调用 ​

cpp
ExtractKeyFrames(instance, 0, 1.0, 0, "value", "png");
csharp
using System.Runtime.InteropServices;
using System.Text;

[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int ExtractKeyFrames(long ola, int videoHandle, int threshold, int maxFrames, string outputDir, string imageFormat);

ExtractKeyFrames(instance, 0, 1.0, 0, "value", "png");
python
from ctypes import CDLL, c_int, c_int64, create_string_buffer

ola = CDLL("OLAPlug_x64.dll")
ola.CreateCOLAPlugInterFace.restype = c_int64
ola.ExtractKeyFrames(instance, 0, 1.0, 0, "value", "png")

返回值 ​

返回值说明
（返回值）整数型：返回提取的关键帧数，失败返回 0。