QT C++ ffmpeg 调用usb 摄像头显示 并录制 H264录制视频
在本文中，我们将深入探讨如何使用QT C++和FFmpeg库来调用USB摄像头，实现实时显示视频流，并进行H264编码的视频录制。FFmpeg是一个强大的开源多媒体处理框架，支持多种编码、解码、转换和流化功能。QT C++则是一个流行的跨平台应用程序开发框架，提供了丰富的图形用户界面（GUI）工具和系统访问接口。
确保你的开发环境中已经安装了QT和FFmpeg库。对于FFmpeg，你需要下载源代码并按照官方文档编译安装，确保配置时包含了所需的编解码器和库，例如libavformat、libavcodec、libavutil和libavdevice，这些是与设备输入输出和编码解码相关的组件。
在QT项目中，你需要引入FFmpeg的头文件和链接库。这可以通过在.pro文件中添加以下行实现：
```cpp
INCLUDEPATH += /path/to/ffmpeg/include
LIBS += -L/path/to/ffmpeg/lib -lavformat -lavcodec -lavutil -lavdevice
```
接下来，创建一个QT窗口，用于显示来自摄像头的视频流。可以使用QVideoWidget或QOpenGLWidget作为显示视图。创建一个QThread子类来处理视频捕获和编码任务，以避免阻塞主线程。在该线程中，你可以使用FFmpeg的`avdevice_open_input()`函数打开USB摄像头，然后使用`avformat_find_stream_info()`获取流信息。
```cpp
AVFormatContext *fmtCtx = nullptr;
if (avformat_open_input(&fmtCtx, "video://0", nullptr, nullptr) != 0) {
// 错误处理
}
if (avformat_find_stream_info(fmtCtx, nullptr) < 0) {
// 错误处理
}
```
找到摄像头的视频流后，你需要创建一个AVCodecContext来配置编码参数。H264编码可以通过查找名为"libx264"的编码器来实现。之后，使用`avcodec_open2()`打开编码器。
```cpp
AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_H264);
AVCodecContext *encCtx = avcodec_alloc_context3(codec);
// 配置编码参数...
if (avcodec_open2(encCtx, codec, nullptr) < 0) {
// 错误处理
}
```
为了实时显示视频流，创建一个QImage从AVFrame中解析像素数据，然后更新QVideoWidget或QOpenGLWidget。同时，你还需要创建一个输出文件，使用`avio_open()`打开，`avformat_write_header()`写入文件头，然后在每一帧编码后使用`av_interleaved_write_frame()`将编码后的数据写入文件。
```cpp
AVOutputFormat *outFmt = av_guess_format("mp4", "output.mp4", nullptr);
AVFormatContext *outFmtCtx = nullptr;
avformat_alloc_output_context2(&outFmtCtx, outFmt, nullptr, "output.mp4");
if (avio_open(&outFmtCtx->pb, "output.mp4", AVIO_FLAG_WRITE) < 0) {
// 错误处理
}
avformat_write_header(outFmtCtx, nullptr);
while (捕获视频帧) {
// 编码和显示帧...
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = nullptr;
pkt.size = 0;
avcodec_encode_video2(encCtx, &pkt, frame, &gotPacket);
if (gotPacket) {
pkt.stream_index = videoStreamIndex;
av_interleaved_write_frame(outFmtCtx, &pkt);
}
}
av_write_trailer(outFmtCtx);
```
别忘了在完成后释放所有资源，关闭输入和输出文件上下文，以及关闭编码器和解码器上下文。
通过以上步骤，你就能在QT C++环境中利用FFmpeg调用USB摄像头，显示视频流，并以H264编码保存为MP4格式的视频文件。这个过程涉及了多媒体处理、多线程编程、文件I/O和编码解码等多个方面的知识，对于深入理解QT和FFmpeg的使用非常有帮助。在实际开发中，可能还需要考虑性能优化、错误处理和用户交互等方面的问题，以提供更好的用户体验。
文件下载
资源详情
[{"title":"（ 1152 个子文件 111.06MB ） QT C++ ffmpeg 调用usb 摄像头显示 并录制 H264录制视频","children":[{"title":"libcrypto.so.1.1 <span style='color:#111;'> 2.96MB </span>","children":null,"spread":false},{"title":"libopenal.so.1 <span style='color:#111;'> 1.87MB </span>","children":null,"spread":false},{"title":"libssl.so.1.1 <span style='color:#111;'> 644.61KB </span>","children":null,"spread":false},{"title":"libavutil.dll.a <span style='color:#111;'> 375.56KB </span>","children":null,"spread":false},{"title":"libavutil.dll.a <span style='color:#111;'> 375.56KB </span>","children":null,"spread":false},{"title":"libavcodec.dll.a <span style='color:#111;'> 174.64KB </span>","children":null,"spread":false},{"title":"libavcodec.dll.a <span style='color:#111;'> 174.64KB </span>","children":null,"spread":false},{"title":"libavfilter.dll.a <span style='color:#111;'> 160.16KB </span>","children":null,"spread":false},{"title":"libavfilter.dll.a <span style='color:#111;'> 160.16KB </span>","children":null,"spread":false},{"title":"libavformat.dll.a <span style='color:#111;'> 136.67KB </span>","children":null,"spread":false},{"title":"libavformat.dll.a <span style='color:#111;'> 136.67KB </span>","children":null,"spread":false},{"title":"libswscale.dll.a <span style='color:#111;'> 21.53KB </span>","children":null,"spread":false},{"title":"libswscale.dll.a <span style='color:#111;'> 21.53KB </span>","children":null,"spread":false},{"title":"libswresample.dll.a <span style='color:#111;'> 16.88KB </span>","children":null,"spread":false},{"title":"libswresample.dll.a <span style='color:#111;'> 16.88KB </span>","children":null,"spread":false},{"title":"libavdevice.dll.a <span style='color:#111;'> 13.20KB </span>","children":null,"spread":false},{"title":"libavdevice.dll.a <span style='color:#111;'> 13.20KB </span>","children":null,"spread":false},{"title":"libpostproc.dll.a <span style='color:#111;'> 7.34KB </span>","children":null,"spread":false},{"title":"libpostproc.dll.a <span style='color:#111;'> 7.34KB </span>","children":null,"spread":false},{"title":"regsvrOCX.bat <span style='color:#111;'> 61B </span>","children":null,"spread":false},{"title":"bar.bmp <span style='color:#111;'> 4.66KB </span>","children":null,"spread":false},{"title":"bar.bmp <span style='color:#111;'> 4.66KB </span>","children":null,"spread":false},{"title":"bgmiddle.bmp <span style='color:#111;'> 2.76KB </span>","children":null,"spread":false},{"title":"bgup.bmp <span style='color:#111;'> 2.76KB </span>","children":null,"spread":false},{"title":"bgmiddle.bmp <span style='color:#111;'> 2.76KB </span>","children":null,"spread":false},{"title":"bgup.bmp <span style='color:#111;'> 2.76KB </span>","children":null,"spread":false},{"title":"bgdown.bmp <span style='color:#111;'> 2.09KB </span>","children":null,"spread":false},{"title":"bgdown.bmp <span style='color:#111;'> 2.09KB </span>","children":null,"spread":false},{"title":"bgup_.bmp <span style='color:#111;'> 1.74KB </span>","children":null,"spread":false},{"title":"bgmiddle_.bmp <span style='color:#111;'> 1.74KB </span>","children":null,"spread":false},{"title":"bgdown_.bmp <span style='color:#111;'> 1.74KB </span>","children":null,"spread":false},{"title":"bgmiddle_.bmp <span style='color:#111;'> 1.74KB </span>","children":null,"spread":false},{"title":"bgup_.bmp <span style='color:#111;'> 1.74KB </span>","children":null,"spread":false},{"title":"bgdown_.bmp <span style='color:#111;'> 1.74KB </span>","children":null,"spread":false},{"title":"SUPERINTEL_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"INSTANT_BP_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"QUALITY_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"MASTERAUXILIARY_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"CAPTURE_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"MAGNIFY_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NOSOUND_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"QUALITY_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SETWND_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SETWND_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"MASTERAUXILIARY_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"PTZ_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"TV_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NoTALK_SELECT.bmp <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"PTZ3D_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"TV_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"LABEL_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NOSOUND_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NOTALK_GRAY.bmp <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"TALK_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NET_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SETWND_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"PTZ_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"CAPTURE_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"E_MAP_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SOUND_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"E_MAP_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"PTZ3D_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"PTZ3D_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"TALK_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NET_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"RECORD_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"TV_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"LABEL_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"INSTANT_BP_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NOSOUND_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"E_MAP_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"MASTERAUXILIARY_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"INSTANT_BP_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"CAPTURE_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"RECORD_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"QUALITY_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SOUND_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SOUND_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"MAGNIFY_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NOTALK_NORMAL.bmp <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"PTZ_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NET_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"RECORD_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"LABEL_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SUPERINTEL_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"TALK_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"MAGNIFY_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SUPERINTEL_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"CAPTURE_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"QUALITY_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SUPERINTEL_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"INSTANT_BP_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"MASTERAUXILIARY_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"PTZ3D_NORMAL.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NOSOUND_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"LABEL_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"TV_GRAY.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NoTALK_SELECT.bmp <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"NOTALK_GRAY.bmp <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"SETWND_SELECT.BMP <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"......","children":null,"spread":false},{"title":"<span style='color:steelblue;'>文件过多，未全部展示</span>","children":null,"spread":false}],"spread":true}]
评论信息
其他资源
- 全国_加密锁驱动_3.8.588。4090.rar
- Mixly第三方库资源.zip
- IEEE RTS79&96; 电力系统可靠性分析算例
- 基于MATLAB的OFDM多普勒频移估计算法仿真分析
- 飞思卡尔蓝宙KEA128资料
- 利用PCA和SVM进行人脸识别
- 同化棋源代码分享
- 研华数据采集卡上位机程序
- 单片机控制的PWM直流电机调速系统，继电器调压
- MAX7219中文资料
- 树形控件和静态切分视图结合程序
- ebaz4205.tar.gz
- 六顶思考帽1.19 - 万能思考方式.pptx
- 【ssm项目源码】在线医院挂号系统.zip
- JSP程序设计期末试卷A题目及其答案.doc
- PADS Gerber设置
- 四川大学20年信号与系统（951）考研真题与答案.zip
- 侧边栏常驻悬浮快速导航菜单jQuery特效
- opencv的运动跟踪
- 甲骨文字典
- android-support-v4和android-support-v7-appcompat
- leetcodejava题解-Java代码类资源
- c#定时服务数据同步源代码
- 用于无线充电系统的发射电力控制-QUALCOMM
- android安全架构深究
免责申明
【只为小站】的资源来自网友分享，仅供学习研究，请务必在下载后24小时内给予删除，不得用于其他任何用途，否则后果自负。基于互联网的特殊性，【只为小站】 无法对用户传输的作品、信息、内容的权属或合法性、合规性、真实性、科学性、完整权、有效性等进行实质审查；无论 【只为小站】 经营者是否已进行审查，用户均应自行承担因其传输的作品、信息、内容而可能或已经产生的侵权或权属纠纷等法律责任。
本站所有资源不代表本站的观点或立场，基于网友分享，根据中国法律《信息网络传播权保护条例》第二十二条之规定，若资源存在侵权或相关问题请联系本站客服人员，zhiweidada#qq.com，请把#换成@，本站将给予最大的支持与配合，做到及时反馈和处理。关于更多版权及免责申明参见 版权及免责申明
本站所有资源不代表本站的观点或立场，基于网友分享，根据中国法律《信息网络传播权保护条例》第二十二条之规定，若资源存在侵权或相关问题请联系本站客服人员，zhiweidada#qq.com，请把#换成@，本站将给予最大的支持与配合，做到及时反馈和处理。关于更多版权及免责申明参见 版权及免责申明