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一个基于 ‌FFmpeg 4.x‌ 和 ‌Qt‌ 的简单视频播放器代码示例，实现视频解码和渲染到 Qt 窗口的功能。

1）ffmpeg库界面，视频解码支持软解和硬解方式。

2）QImage/QPixmap显示视频图片。

‌1. Qt 项目配置（`.pro` 文件）

QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11INCLUDEPATH += $$PWD/ffmpeg-4.2.2-win32/include
LIBS += -L$$PWD/ffmpeg-4.2.2-win32/lib -lavcodec -lavformat -lavutil -lswscale# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \mainwindow.cpp \playimage.cpp \videodecode.cppHEADERS += \mainwindow.h \playimage.h \videodecode.hFORMS += \mainwindow.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

‌2. 视频解码类‌

‌文件 videodecode.h

#ifndef VIDEODECODE_H
#define VIDEODECODE_H//视频解码类
#include <QString>
#include <QImage>
#include <thread>extern "C" {
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>
#include <libavutil/imgutils.h>
}//流类型
enum StreamType
{StreamType_Video        = 0,StreamType_Audio        = 1,StreamType_Text         = 2,
};//格式类型
enum FormatType
{FormatType_RGB24        =   0,FormatType_RGB32        =   1,FormatType_YUV420       =   2,FormatType_YUV422       =   3,
};//文件状态
enum  FileStatus
{FileStatus_OverFileTail     =   0,  //达到文件尾FileStatus_OverFileHead     =   1,  //达到文件头FileStatus_TrigeException   =   2,  //发生异常
};//流解码回调函数
typedef void (*StreamDecodeCallback)(int nStreamType, int nFormatType, long long llDecodeTs, long long llPlayTs, int width, int height, unsigned char ** pStreamData, int * linesize, void * pUserData);//文件状态回调函数
typedef  void (*FileStatusCallback)(int FileStatus, int nErrorCode, void * pUserData);class VideoDecode
{
public:VideoDecode();~VideoDecode();public:void globalInit();//初始化ffmpeg库（整个程序中只需加载一次）void globalUnInit();//反初始化ffmpeg库（整个程序中只需加载一次）public:void setStreamDecodeCallback(StreamDecodeCallback funStreamDecodeCallback, void * userData);void setFileStatusCallback(FileStatusCallback funFileStatusCallback, void * userData);void setHWDecoder(bool flag);                 // 是否使用硬件解码器bool isHWDecoder();bool open(const QString& url);              // 打开媒体文件，或者流媒体rtmp、strp、httpvoid close();                               // 关闭bool isClose();public:void decodeProccessThread();                //解码线程static QImage ConvertRGB24FrameToQImage(unsigned char *data, int width, int height);protected:void initHWDecoder(const AVCodec *codec);bool dataCopy();    //硬件解码完成需要将数据从GPU复制到CPUvoid freeDecode();qreal rationalToDouble(AVRational* rational);private:// FFmpeg 相关对象AVFormatContext *formatCtx = nullptr;AVCodecContext *codecCtx = nullptr;AVFrame *frame = nullptr, *rgbFrame = nullptr;AVFrame *frameHW = nullptr;SwsContext *swsCtx = nullptr;uchar* buffer = nullptr;                      // YUV图像需要转换位RGBA图像，这里保存转换后的图形数据AVPacket* packet = nullptr;int videoStreamIndex = -1;  // 视频流索引qint64 totalTime    = 0;                    // 视频总时长qint64 totalFrames  = 0;                    // 视频总帧数qint64 obtainFrames = 0;                    // 视频当前获取到的帧数qint64 pts          = 0;                    // 图像帧的显示时间qreal  frameRate    = 0;                    // 视频帧率int  width = 0;         //视频分辨率大小widthint  height = 0;        //视频分辨率大小heightstd::vector<int> vecHWDeviceTypes;            // 保存当前环境支持的硬件解码器AVBufferRef* hw_device_ctx = nullptr;         // 对数据缓冲区的引用bool   hwDecoderFlag = false;                 // 记录是否使用硬件解码std::thread threadDecode;bool stopWorkFlag = true;StreamDecodeCallback funCallbackByStreamDecode = nullptr;void * userDataByStreamDecode = nullptr;FileStatusCallback funCallbackByFileStatus = nullptr;void * userDataByFileStatus = nullptr;
};#endif // VIDEODECODE_H

‌文件 videodecode.cpp

#include "videodecode.h"
#include <QTime>
#include <QDebug>
#include <QStringList>
#include <chrono>/*********************************** FFmpeg获取GPU硬件解码帧格式的回调函数 *****************************************/
static enum AVPixelFormat g_pixelFormat;/*** @brief      回调函数，获取GPU硬件解码帧的格式* @param s* @param fmt* @return*/
AVPixelFormat get_hw_format(AVCodecContext* s, const enum AVPixelFormat* fmt)
{Q_UNUSED(s)const enum AVPixelFormat* p;for (p = fmt; *p != -1; p++){if(*p == g_pixelFormat){return *p;}}qDebug() << "无法获取硬件表面格式.";         // 当同时打开太多路视频时，如果超过了GPU的能力，可能会返回找不到解码帧格式return AV_PIX_FMT_NONE;
}
/************************************************ END ******************************************************/VideoDecode::VideoDecode()
{}VideoDecode::~VideoDecode()
{
}void VideoDecode::globalInit()
{//        av_register_all();         // 已经从源码中删除/*** 初始化网络库,用于打开网络流媒体，此函数仅用于解决旧GnuTLS或OpenSSL库的线程安全问题。* 一旦删除对旧GnuTLS和OpenSSL库的支持，此函数将被弃用，并且此函数不再有任何用途。*/avformat_network_init();
}void VideoDecode::globalUnInit()
{avformat_network_deinit();
}qreal VideoDecode::rationalToDouble(AVRational* rational)
{qreal frameRate = (rational->den == 0) ? 0 : (qreal(rational->num) / rational->den);return frameRate;
}void VideoDecode::setStreamDecodeCallback(StreamDecodeCallback funStreamDecodeCallback, void * userData)
{funCallbackByStreamDecode = funStreamDecodeCallback;userDataByStreamDecode = userData;
}
void VideoDecode::setFileStatusCallback(FileStatusCallback funFileStatusCallback, void * userData)
{funCallbackByFileStatus = funFileStatusCallback;userDataByFileStatus = userData;
}//初始化硬件解码器
void VideoDecode::initHWDecoder(const AVCodec *codec)
{if(!codec) return;for(int i = 0; ; i++){const AVCodecHWConfig* config = avcodec_get_hw_config(codec, i);    // 检索编解码器支持的硬件配置。if(!config){qDebug() << "打开硬件解码器失败！";return;          // 没有找到支持的硬件配置}if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX)       // 判断是否是设备类型{for(auto i : vecHWDeviceTypes){if(config->device_type == AVHWDeviceType(i))                 // 判断设备类型是否是支持的硬件解码器{g_pixelFormat = config->pix_fmt;// 打开指定类型的设备，并为其创建AVHWDeviceContext。int ret = av_hwdevice_ctx_create(&hw_device_ctx, config->device_type, nullptr, nullptr, 0);if(ret < 0){freeDecode();return ;}qDebug() << "打开硬件解码器：" << av_hwdevice_get_type_name(config->device_type);codecCtx->hw_device_ctx = av_buffer_ref(hw_device_ctx);  // 创建一个对AVBuffer的新引用。codecCtx->get_format = get_hw_format;                    // 由一些解码器调用，以选择将用于输出帧的像素格式return;}}}}
}//硬件解码完成需要将数据从GPU复制到CPU
bool VideoDecode::dataCopy()
{if(frame->format != g_pixelFormat){av_frame_unref(frame);return false;}// av_hwframe_map处理速度比av_hwframe_transfer_data快（av_hwframe_map在ffmpeg3.3以后才有）int ret = av_hwframe_map(frameHW, frame, AV_HWFRAME_MAP_DIRECT);                   // 映射硬件数据帧/*av_hwframe_map 映射硬件数据帧，第3个参数值有三种类型：AV_HWFRAME_MAP_READ：目标帧可读。AV_HWFRAME_MAP_WRITE：目标帧可写。AV_HWFRAME_MAP_DIRECT：避免数据拷贝（依赖硬件支持）‌。优先使用 AV_HWFRAME_MAP_DIRECT 减少内存拷贝开销‌。使用AV_HWFRAME_MAP_DIRECT时，你应该确保你的应用逻辑不会修改通过映射获得的软件帧内容，以避免不期望的副作用。使用AV_HWFRAME_MAP_READ时，你将获得数据的一致性但可能会有性能上的损失。*/if(ret >= 0){//映射硬件数据帧成功frameHW->width = frame->width;frameHW->height = frame->height;}else{//映射硬件数据帧失败ret = av_hwframe_transfer_data(frameHW, frame, 0);       // 将解码后的数据从GPU复制到CPU(frameHW) 比较耗时，但硬解码速度比软解码快很多if(ret < 0){av_frame_unref(frame);return false;}av_frame_copy_props(frameHW, frame);   // 仅将“metadata”字段从src复制到dst。}return true;
}void VideoDecode::setHWDecoder(bool flag)
{hwDecoderFlag = flag;
}
bool VideoDecode::isHWDecoder()
{return hwDecoderFlag;
}bool VideoDecode::open(const QString& url)
{if(url.isNull()) return false;AVHWDeviceType type = AV_HWDEVICE_TYPE_NONE;      // ffmpeg支持的硬件解码器QStringList strTypes;while ((type = av_hwdevice_iterate_types(type)) != AV_HWDEVICE_TYPE_NONE)       // 遍历支持的设备类型。{vecHWDeviceTypes.push_back(type);const char* ctype = av_hwdevice_get_type_name(type);  // 获取AVHWDeviceType的字符串名称。if(ctype){strTypes.append(QString(ctype));}}qDebug() << "支持的硬件解码器:";qDebug() << strTypes;AVDictionary* dict = nullptr;av_dict_set(&dict, "rtsp_transport", "tcp", 0);      // 设置rtsp流使用tcp打开，如果打开失败错误信息为【Error number -135 occurred】可以切换（UDP、tcp、udp_multicast、http），比如vlc推流就需要使用udp打开av_dict_set(&dict, "max_delay", "3", 0);             // 设置最大复用或解复用延迟（以微秒为单位）。当通过【UDP】 接收数据时，解复用器尝试重新排序接收到的数据包（因为它们可能无序到达，或者数据包可能完全丢失）。这可以通过将最大解复用延迟设置为零（通过max_delayAVFormatContext 字段）来禁用。av_dict_set(&dict, "timeout", "1000000", 0);         // 以微秒为单位设置套接字 TCP I/O 超时，如果等待时间过短，也可能会还没连接就返回了。// 打开输入流并返回解封装上下文int ret = avformat_open_input(&formatCtx,          // 返回解封装上下文url.toStdString().data(),  // 打开视频地址nullptr,                   // 如果非null，此参数强制使用特定的输入格式。自动选择解封装器（文件格式）&dict);                    // 参数设置// 释放参数字典if(dict){av_dict_free(&dict);}// 打开视频失败if(ret < 0){qDebug() << "Failed to avformat_open_input";return false;}// 读取媒体文件的数据包以获取流信息。ret = avformat_find_stream_info(formatCtx, nullptr);if(ret < 0){qDebug() << "Failed to avformat_find_stream_info";freeDecode();return false;}totalTime = formatCtx->duration / (AV_TIME_BASE / 1000); // 计算视频总时长（毫秒）qDebug() << QString("视频总时长：%1 ms，[%2]").arg(totalTime).arg(QTime::fromMSecsSinceStartOfDay(int(totalTime)).toString("HH:mm:ss zzz"));// 通过AVMediaType枚举查询视频流ID（也可以通过遍历查找），最后一个参数无用videoStreamIndex = av_find_best_stream(formatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0);if(videoStreamIndex < 0){qDebug() << "Failed to av_find_best_stream";freeDecode();return false;}AVStream* videoStream = formatCtx->streams[videoStreamIndex];  // 通过查询到的索引获取视频流// 获取视频图像分辨率（AVStream中的AVCodecContext在新版本中弃用，改为使用AVCodecParameters）width = videoStream->codecpar->width;height = videoStream->codecpar->height;frameRate = rationalToDouble(&videoStream->avg_frame_rate);  // 视频帧率// 通过解码器ID获取视频解码器（新版本返回值必须使用const）const AVCodec* codec = avcodec_find_decoder(videoStream->codecpar->codec_id);totalFrames = videoStream->nb_frames;qDebug() << QString("分辨率：[w:%1,h:%2] 帧率：%3  总帧数：%4  解码器：%5").arg(width).arg(height).arg(frameRate).arg(totalFrames).arg(codec->name);// 分配AVCodecContext并将其字段设置为默认值。codecCtx = avcodec_alloc_context3(codec);if(!codecCtx){qDebug() << "Failed to avcodec_alloc_context3";freeDecode();return false;}// 使用视频流的codecpar为解码器上下文赋值ret = avcodec_parameters_to_context(codecCtx, videoStream->codecpar);if(ret < 0){qDebug() << "Failed to avcodec_parameters_to_context";freeDecode();return false;}codecCtx->flags2 |= AV_CODEC_FLAG2_FAST;    // 允许不符合规范的加速技巧。codecCtx->thread_count = 8;                 // 使用8线程解码if(isHWDecoder()){initHWDecoder(codec);     // 初始化硬件解码器（在avcodec_open2前调用）}// 初始化解码器上下文，如果之前avcodec_alloc_context3传入了解码器，这里设置NULL就可以ret = avcodec_open2(codecCtx, nullptr, nullptr);if(ret < 0){qDebug() << "Failed to avcodec_open2";freeDecode();return false;}// 分配AVPacket并将其字段设置为默认值。packet = av_packet_alloc();if(!packet){qDebug() << "Failed to av_packet_alloc";freeDecode();return false;}// 初始化帧和转换上下文frame = av_frame_alloc();rgbFrame = av_frame_alloc();frameHW = av_frame_alloc();int size = av_image_get_buffer_size(AV_PIX_FMT_RGB24, codecCtx->width, codecCtx->height, 1);buffer = (uint8_t *)av_malloc(size + 1000);av_image_fill_arrays(rgbFrame->data, rgbFrame->linesize, buffer, AV_PIX_FMT_RGB24,codecCtx->width, codecCtx->height, 1);/*// 初始化 SWS 上下文（YUV -> RGB 转换）swsCtx = sws_getContext(codecCtx->width, codecCtx->height, codecCtx->pix_fmt,codecCtx->width, codecCtx->height, AV_PIX_FMT_RGB24,SWS_BILINEAR, nullptr, nullptr, nullptr);*/stopWorkFlag = false;std::thread t(std::bind(&VideoDecode::decodeProccessThread,this));threadDecode = std::move(t);return true;
}void VideoDecode::close()
{stopWorkFlag = true;// 因为avformat_flush不会刷新AVIOContext (s->pb)。如果有必要，在调用此函数之前调用avio_flush(s->pb)。if(formatCtx && formatCtx->pb){avio_flush(formatCtx->pb);}if(formatCtx){avformat_flush(formatCtx);   // 清理读取缓冲}if(threadDecode.joinable()){threadDecode.join();}freeDecode();
}bool VideoDecode::isClose()
{return stopWorkFlag;
}QImage VideoDecode::ConvertRGB24FrameToQImage(unsigned char *data, int width, int height)
{// 创建 QImage 并显示QImage img(data, width, height, QImage::Format_RGB888);return img;
}void VideoDecode::decodeProccessThread()
{std::chrono::high_resolution_clock::time_point tpStart = std::chrono::high_resolution_clock::now();int nWaitTimes = 40;if(frameRate != 0){nWaitTimes = 1000.0/frameRate;}long long llDecodeTs = 0;long long llPlayTs = 0;long long llStartPlayTs = 0;bool bStartPlayTsSetValueFlag = false;bool bProccessFileTail = false;while (true){if(stopWorkFlag){break;}// 读取下一帧数据int readRet = av_read_frame(formatCtx, packet);if(readRet < 0){if (readRet == AVERROR_EOF){int ret = avcodec_send_packet(codecCtx, packet); // 读取完成后向解码器中传如空AVPacket，否则无法读取出最后几帧if(ret < 0){av_packet_unref(packet);bProccessFileTail = true;break;}}else{break;}}else{if(stopWorkFlag){break;}if(packet->stream_index == videoStreamIndex)     // 如果是图像数据则进行解码{av_packet_rescale_ts(packet, formatCtx->streams[videoStreamIndex]->time_base, codecCtx->time_base); // 转换至解码器时间基‌// 将读取到的原始数据包传入解码器int ret = avcodec_send_packet(codecCtx, packet);if(ret < 0){qDebug() << "Error sending packet";av_packet_unref(packet);continue;}}else{//其他流（比如：音频）av_packet_unref(packet);continue;}}// 接收解码后的帧(这里一次只解码一帧)int ret = avcodec_receive_frame(codecCtx, frame);if (ret == AVERROR(EAGAIN)){av_packet_unref(packet);continue;}else if (ret == AVERROR_EOF){av_packet_unref(packet);//当无法读取到AVPacket并且解码器中也没有数据时表示读取完成bProccessFileTail = true;break;}else if (ret < 0){qDebug() << "Error during decoding";av_packet_unref(packet);continue;}else{// 这样写是为了兼容软解码或者硬件解码打开失败情况AVFrame*  frameTemp = frame;if(!frame->data[0])               // 如果是硬件解码就进入{// 将解码后的数据从GPU拷贝到CPUif(!dataCopy()){av_frame_unref(frameHW);continue;}frameTemp = frameHW;}// 处理时间戳的核心逻辑int64_t raw_pts = frameTemp->pts;int64_t raw_dts = frameTemp->pkt_dts;// 处理未定义时间戳的情况if (raw_pts == AV_NOPTS_VALUE){// 使用DTS或估算PTS（需要根据帧率等参数）if(raw_dts != AV_NOPTS_VALUE){raw_pts = raw_dts;}else{raw_pts = 0;raw_dts = 0;}}// 转换为显示时间戳（秒）double display_time = raw_pts * av_q2d(codecCtx->time_base);// 转换为全局时间基（例如用于音视频同步）AVRational timeBaseTemp{1, AV_TIME_BASE};//AV_TIME_BASE_QllPlayTs = av_rescale_q(raw_pts, codecCtx->time_base, timeBaseTemp);llDecodeTs = av_rescale_q(raw_dts, codecCtx->time_base, timeBaseTemp);if(!bStartPlayTsSetValueFlag){llStartPlayTs = llPlayTs;bStartPlayTsSetValueFlag = true;}qDebug("Frame:%4d PTS:%lld display_time:%.2f DTS:%lld llPlayTs:%lld llDecodeTs:%lld packet dts:%lld pts:%lld",codecCtx->frame_number, raw_pts, display_time, raw_dts, llPlayTs, llDecodeTs, packet->dts, packet->pts);av_packet_unref(packet);  // 释放数据包，引用计数-1，为0时释放空间if(!swsCtx || (frameTemp->width != width || frameTemp->height != height)){//重新申请width = frameTemp->width;height = frameTemp->height;if(swsCtx){sws_freeContext(swsCtx);swsCtx = nullptr;}if(buffer){av_free(buffer);buffer = nullptr;}int size = av_image_get_buffer_size(AV_PIX_FMT_RGB24, frameTemp->width, frameTemp->height, 1);buffer = (uint8_t *)av_malloc(size + 1000);av_image_fill_arrays(rgbFrame->data, rgbFrame->linesize, buffer, AV_PIX_FMT_RGB24,frameTemp->width, frameTemp->height, 1);swsCtx = sws_getCachedContext(swsCtx,frameTemp->width,                     // 输入图像的宽度frameTemp->height,                    // 输入图像的高度(AVPixelFormat)frameTemp->format,     // 输入图像的像素格式frameTemp->width,                     // 输出图像的宽度frameTemp->height,                    // 输出图像的高度AV_PIX_FMT_RGB24,                    // 输出图像的像素格式SWS_BILINEAR,                       // 选择缩放算法(只有当输入输出图像大小不同时有效),一般选择SWS_FAST_BILINEARnullptr,                            // 输入图像的滤波器信息, 若不需要传NULLnullptr,                            // 输出图像的滤波器信息, 若不需要传NULLnullptr);}//休眠等待long long llPlayTsDiff = llPlayTs - llStartPlayTs;auto duration = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::high_resolution_clock::now() - tpStart);// 计算需要等待的时间（单位：微秒）int64_t delay = llPlayTsDiff - duration.count();// 同步控制if (delay > 0){std::this_thread::sleep_for(std::chrono::microseconds(delay)); // 等待至目标时间‌}else if (delay < -100000){// 允许100ms误差阈值// 丢弃滞后帧，追赶进度‌av_frame_unref(frame);av_frame_unref(frameHW);continue;}// 转换颜色空间到 RGB24sws_scale(swsCtx, frameTemp->data, frameTemp->linesize, 0, frameTemp->height, rgbFrame->data, rgbFrame->linesize);//回调流书籍（方便渲染）if(funCallbackByStreamDecode){funCallbackByStreamDecode(StreamType_Video,FormatType_RGB24,llDecodeTs,llPlayTs,frameTemp->width,frameTemp->height,rgbFrame->data, rgbFrame->linesize, userDataByStreamDecode);}av_frame_unref(frame);av_frame_unref(frameHW);}}if(bProccessFileTail && !stopWorkFlag){if(funCallbackByFileStatus != nullptr){funCallbackByFileStatus(FileStatus_OverFileTail, 0, userDataByFileStatus);}}
}void VideoDecode::freeDecode()
{// 释放资源if (swsCtx){sws_freeContext(swsCtx);swsCtx = nullptr;}if (rgbFrame){av_frame_free(&rgbFrame);rgbFrame = nullptr;}if (frame){av_frame_free(&frame);frame = nullptr;}if(frameHW){av_frame_free(&frameHW);frameHW = nullptr;}if (codecCtx){avcodec_free_context(&codecCtx);codecCtx = nullptr;}if (formatCtx){avformat_close_input(&formatCtx);formatCtx = nullptr;}if(buffer != nullptr){av_free(buffer);buffer = nullptr;}
}

‌3.主窗口调用代码

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
#include <QDebug>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);connect(this, SIGNAL(sgnShowImage(QImage)), this, SLOT(sltShowImage(QImage)));vdVideoDecode.globalInit();m_playImages = this->findChildren<PlayImage *>();
}MainWindow::~MainWindow()
{delete ui;vdVideoDecode.globalUnInit();
}void MainWindow::sltShowImage(QImage qimage)
{if(vdVideoDecode.isClose())return;for(int i = 0; i < m_playImages.count(); i++){m_playImages.at(i)->updateImage(qimage);}
}void MainWindow::on_pushButtonOpenFile_clicked(bool checked)
{QString filename = QFileDialog::getOpenFileName(nullptr, "Open Video File");if (!filename.isEmpty()){//vdVideoDecode.setHWDecoder(true);vdVideoDecode.setStreamDecodeCallback([](int nStreamType, int nFormatType, long long llDecodeTs, long long llPlayTs, int width, int height, unsigned char ** pStreamData, int * linesize, void * pUserData){MainWindow *pMainWindow = (MainWindow *)pUserData;QImage qimage = VideoDecode::ConvertRGB24FrameToQImage(pStreamData[0],width,height);emit pMainWindow->sgnShowImage(qimage);},this);vdVideoDecode.setFileStatusCallback([](int FileStatus, int nErrorCode, void * pUserData){qDebug()<<"file is end";},this);vdVideoDecode.open(filename);/*if(player.openFile(filename)){player.show();}*/}
}void MainWindow::on_pushButtonCloseFile_clicked()
{vdVideoDecode.close();
}