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快速提取单帧 - ExtractSingleFrame

函数简介

快速提取单帧(无需保持视频打开状态)。

接口名称

ExtractSingleFrame

DLL调用

c
int64_t ExtractSingleFrame(int64_t instance, string videoPath, int32_t frameIndex);

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。
videoPath字符串视频文件路径。
frameIndex整数型帧索引。

示例

SDK 调用

cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
long handle = ola.ExtractSingleFrame("videos/demo.mp4", 0);
csharp
using OLAPlug;

var ola = new OLAPlugServer();
long handle = ola.ExtractSingleFrame("videos/demo.mp4", 0);
python
from OLAPlugServer import OLAPlugServer

ola = OLAPlugServer()
handle = ola.ExtractSingleFrame("videos/demo.mp4", 0)
java
import com.olaplug.OLAPlugServer;

OLAPlugServer ola = new OLAPlugServer();
long handle = ola.ExtractSingleFrame("videos/demo.mp4", 0);
cpp
var ola = com("OlaPlug.OlaSoft")
var handle = ola.ExtractSingleFrame("videos/demo.mp4", 0)
vbscript
Set ola = CreateObject("OlaPlug.OlaSoft")
handle = ola.ExtractSingleFrame("videos/demo.mp4", 0)
text
.局部变量 ola, OLAPlug
ola.创建 ()
handle = ola.ExtractSingleFrame("videos/demo.mp4", 0)
aardio
import OLAPlugServer;
var ola = OLAPlugServer();
var handle = ola.ExtractSingleFrame("videos/demo.mp4", 0);
text
变量 ola <类型 = OLAPlugServer>
ola = 新建 OLAPlugServer
长整数 handle = ola.ExtractSingleFrame("videos/demo.mp4", 0)
cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
long handle = ola.ExtractSingleFrame("videos/demo.mp4", 0);

原生 DLL 调用

cpp
ExtractSingleFrame(instance, "videos/demo.mp4", 0);
csharp
using System.Runtime.InteropServices;
using System.Text;

[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int ExtractSingleFrame(long ola, string videoPath, int frameIndex);

ExtractSingleFrame(instance, "videos/demo.mp4", 0);
python
from ctypes import CDLL, c_int, c_int64, create_string_buffer

ola = CDLL("OLAPlug_x64.dll")
ola.CreateCOLAPlugInterFace.restype = c_int64
ola.ExtractSingleFrame(instance, "videos/demo.mp4", 0)

返回值

返回值说明
(返回值)长整数型:图像句柄(BGRA格式),失败返回 0。

注意事项

项目说明
释放内存返回的图像句柄需调用 FreeImagePtr 释放。
此方法无需保持视频打开状态此方法无需保持视频打开状态,适合单次提取。