最简单的基于FFmpeg的AVDevice例子（屏幕录制）

浅浅的花香味﹌ 2022-08-20 06:12 263阅读 0赞

在工作中，项目组中曾经一个项目需要将PC端做视频的录制，并且将实时码流转发给对应的大屏，大屏是9分屏的大屏，监控中心的大屏。这样最终能做到的就是在PC上面操作就能在大屏上面看到对应的操作了。这个了解了ffmpeg的屏幕录制功能就能瞬间开发了，并且调优这块，主要先是处理码流的帧率要达到指标，然后再将码流选择合适的格式，然后再进行打包到协议层，如通过TS + RTP格式，打给大屏那边的linux程序，让其显示到大屏上。

=====================================================  
最简单的基于FFmpeg的AVDevice例子文章列表：

[最简单的基于FFmpeg的AVDevice例子（读取摄像头）][FFmpeg_AVDevice]

[最简单的基于FFmpeg的AVDevice例子（屏幕录制）][FFmpeg_AVDevice 1]  
=====================================================

FFmpeg中有一个和多媒体设备交互的类库：Libavdevice。使用这个库可以读取电脑的多媒体设备的数据，或者输出数据到指定的多媒体设备上。

计划写2个有关FFmpeg的libavdevice类库的例子。上篇文章记录了一个基于FFmpeg的Libavdevice类库读取摄像头数据的例子。本篇文章记录一个基于FFmpeg的Libavdevice类库录制屏幕的例子。本文程序录制当前桌面内容并且解码显示出来。有关解码显示方面的代码本文不再详述，可以参考文章：  
《[100行代码实现最简单的基于FFMPEG+SDL的视频播放器（SDL1.x）][100_FFMPEG_SDL_SDL1.x]》

## 抓屏方法 ##

上篇文章记录了libavdevice的使用方法，本文不再重复。在Windows系统使用libavdevice抓取屏幕数据有两种方法：gdigrab和dshow。下文分别介绍。  
1. gdigrab  
gdigrab是FFmpeg专门用于抓取Windows桌面的设备。非常适合用于屏幕录制。它通过不同的输入URL支持两种方式的抓取：  
（1）“desktop”：抓取整张桌面。或者抓取桌面中的一个特定的区域。  
（2）“title=\{窗口名称\}”：抓取屏幕中特定的一个窗口（目前中文窗口还有乱码问题）。  
gdigrab另外还支持一些参数，用于设定抓屏的位置：  
offset\_x：抓屏起始点横坐标。  
offset\_y：抓屏起始点纵坐标。  
video\_size：抓屏的大小。  
framerate：抓屏的帧率。  
参考的代码如下：

**\[cpp\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  //Use gdigrab
2.  AVDictionary\* options = NULL;
3.  //Set some options
4.  //grabbing frame rate
5.  //av\_dict\_set(&options,"framerate","5",0);
6.  //The distance from the left edge of the screen or desktop
7.  //av\_dict\_set(&options,"offset\_x","20",0);
8.  //The distance from the top edge of the screen or desktop
9.  //av\_dict\_set(&options,"offset\_y","40",0);
10. //Video frame size. The default is to capture the full screen
11. //av\_dict\_set(&options,"video\_size","640x480",0);
12. AVInputFormat \*ifmt=av\_find\_input\_format("gdigrab");
13. if(avformat\_open\_input(&pFormatCtx,"desktop",ifmt,&options)!=0)\{
14. printf("Couldn't open input stream.（无法打开输入流）\\n");
15. return \-1;
16. \}

2. dshow  
使用dshow抓屏需要安装抓屏软件：screen-capture-recorder  
软件地址： [http://sourceforge.net/projects/screencapturer/][http_sourceforge.net_projects_screencapturer]  
下载软件安装完成后，可以指定dshow的输入设备为“screen-capture-recorder”即可。有关dshow设备的使用方法在上一篇文章中已经有详细叙述，这里不再重复。参考的代码如下：

**\[cpp\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  AVInputFormat \*ifmt=av\_find\_input\_format("dshow");
2.  if(avformat\_open\_input(&pFormatCtx,"video=screen-capture-recorder",ifmt,NULL)!=0)\{
3.  printf("Couldn't open input stream.（无法打开输入流）\\n");
4.  return \-1;
5.  \}

注：上述两种抓屏方法也可以直接使用ffmpeg.exe的命令行完成，可以参考文章：

[FFmpeg获取DirectShow设备数据（摄像头，录屏） ][FFmpeg_DirectShow_]

在Linux下可以使用x11grab抓屏，在MacOS下可以使用avfoundation抓屏，在这里不再详细叙述。

## 代码 ##

下面直接贴上程序代码：

**\[cpp\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  /\*\*
2.   \* 最简单的基于FFmpeg的AVDevice例子（屏幕录制）
3.   \* Simplest FFmpeg Device (Screen Capture)
4.   \*
5.   \* 雷霄骅 Lei Xiaohua
6.   \* leixiaohua1020@126.com
7.   \* 中国传媒大学/数字电视技术
8.   \* Communication University of China / Digital TV Technology
9.   \* http://blog.csdn.net/leixiaohua1020
10.  \*
11.  \* 本程序实现了屏幕录制功能。可以录制并播放桌面数据。是基于FFmpeg
12.  \* 的libavdevice类库最简单的例子。通过该例子，可以学习FFmpeg中
13.  \* libavdevice类库的使用方法。
14.  \* 本程序在Windows下可以使用2种方式录制屏幕：
15.  \* 1.gdigrab: Win32下的基于GDI的屏幕录制设备。
16.  \* 抓取桌面的时候，输入URL为“desktop”。
17.  \* 2.dshow: 使用Directshow。注意需要安装额外的软件screen-capture-recorder
18.  \* 在Linux下可以使用x11grab录制屏幕。
19.  \* 在MacOS下可以使用avfoundation录制屏幕。
20.  \*
21.  \* This software capture screen of computer. It's the simplest example
22.  \* about usage of FFmpeg's libavdevice Library. 
23.  \* It's suiltable for the beginner of FFmpeg.
24.  \* This software support 2 methods to capture screen in Microsoft Windows:
25.  \* 1.gdigrab: Win32 GDI-based screen capture device.
26.  \* Input URL in avformat\_open\_input() is "desktop".
27.  \* 2.dshow: Use Directshow. Need to install screen-capture-recorder.
28.  \* It use x11grab to capture screen in Linux.
29.  \* It use avfoundation to capture screen in MacOS.
30.  \*/
31. 
32. 
33. \#include <stdio.h>
34. 
35. \#define \_\_STDC\_CONSTANT\_MACROS
36. 
37. \#ifdef \_WIN32
38. //Windows
39. extern "C"
40. \{
41. \#include "libavcodec/avcodec.h"
42. \#include "libavformat/avformat.h"
43. \#include "libswscale/swscale.h"
44. \#include "libavdevice/avdevice.h"
45. \#include "SDL/SDL.h"
46. \};
47. \#else
48. //Linux...
49. \#ifdef \_\_cplusplus
50. extern "C"
51. \{
52. \#endif
53. \#include <libavcodec/avcodec.h>
54. \#include <libavformat/avformat.h>
55. \#include <libswscale/swscale.h>
56. \#include <libavdevice/avdevice.h>
57. \#include <SDL/SDL.h>
58. \#ifdef \_\_cplusplus
59. \};
60. \#endif
61. \#endif
62. 
63. //Output YUV420P 
64. \#define OUTPUT\_YUV420P 0
65. //'1' Use Dshow 
66. //'0' Use GDIgrab
67. \#define USE\_DSHOW 0
68. 
69. //Refresh Event
70. \#define SFM\_REFRESH\_EVENT (SDL\_USEREVENT + 1)
71. 
72. int thread\_exit=0;
73. 
74. int sfp\_refresh\_thread(void \*opaque)
75. \{
76. while (thread\_exit==0) \{
77. SDL\_Event event;
78. event.type = SFM\_REFRESH\_EVENT;
79. SDL\_PushEvent(&event);
80. SDL\_Delay(40);
81. \}
82. return 0;
83. \}
84. 
85. //Show Dshow Device
86. void show\_dshow\_device()\{
87. AVFormatContext \*pFormatCtx = avformat\_alloc\_context();
88. AVDictionary\* options = NULL;
89. av\_dict\_set(&options,"list\_devices","true",0);
90. AVInputFormat \*iformat = av\_find\_input\_format("dshow");
91. printf("========Device Info=============\\n");
92. avformat\_open\_input(&pFormatCtx,"video=dummy",iformat,&options);
93. printf("================================\\n");
94. \}
95. 
96. //Show AVFoundation Device
97. void show\_avfoundation\_device()\{
98. AVFormatContext \*pFormatCtx = avformat\_alloc\_context();
99. AVDictionary\* options = NULL;
100. av\_dict\_set(&options,"list\_devices","true",0);
101. AVInputFormat \*iformat = av\_find\_input\_format("avfoundation");
102. printf("==AVFoundation Device Info===\\n");
103. avformat\_open\_input(&pFormatCtx,"",iformat,&options);
104. printf("=============================\\n");
105. \}
106. 
107. 
108. 
109. int main(int argc, char\* argv\[\])
110. \{
111. 
112. AVFormatContext \*pFormatCtx;
113. int i, videoindex;
114. AVCodecContext \*pCodecCtx;
115. AVCodec \*pCodec;
116. 
117. av\_register\_all();
118. avformat\_network\_init();
119. pFormatCtx = avformat\_alloc\_context();
120. 
121. //Open File
122. //char filepath\[\]="src01\_480x272\_22.h265";
123. //avformat\_open\_input(&pFormatCtx,filepath,NULL,NULL)
124. 
125. //Register Device
126. avdevice\_register\_all();
127. //Windows
128. \#ifdef \_WIN32
129. \#if USE\_DSHOW
130. //Use dshow
131. //
132. //Need to Install screen-capture-recorder
133. //screen-capture-recorder
134. //Website: http://sourceforge.net/projects/screencapturer/
135. //
136. AVInputFormat \*ifmt=av\_find\_input\_format("dshow");
137. if(avformat\_open\_input(&pFormatCtx,"video=screen-capture-recorder",ifmt,NULL)!=0)\{
138. printf("Couldn't open input stream.\\n");
139. return \-1;
140. \}
141. \#else
142. //Use gdigrab
143. AVDictionary\* options = NULL;
144. //Set some options
145. //grabbing frame rate
146. //av\_dict\_set(&options,"framerate","5",0);
147. //The distance from the left edge of the screen or desktop
148. //av\_dict\_set(&options,"offset\_x","20",0);
149. //The distance from the top edge of the screen or desktop
150. //av\_dict\_set(&options,"offset\_y","40",0);
151. //Video frame size. The default is to capture the full screen
152. //av\_dict\_set(&options,"video\_size","640x480",0);
153. AVInputFormat \*ifmt=av\_find\_input\_format("gdigrab");
154. if(avformat\_open\_input(&pFormatCtx,"desktop",ifmt,&options)!=0)\{
155. printf("Couldn't open input stream.\\n");
156. return \-1;
157. \}
158. 
159. \#endif
160. \#elif defined linux
161. //Linux
162. AVDictionary\* options = NULL;
163. //Set some options
164. //grabbing frame rate
165. //av\_dict\_set(&options,"framerate","5",0);
166. //Make the grabbed area follow the mouse
167. //av\_dict\_set(&options,"follow\_mouse","centered",0);
168. //Video frame size. The default is to capture the full screen
169. //av\_dict\_set(&options,"video\_size","640x480",0);
170. AVInputFormat \*ifmt=av\_find\_input\_format("x11grab");
171. //Grab at position 10,20
172. if(avformat\_open\_input(&pFormatCtx,":0.0+10,20",ifmt,&options)!=0)\{
173. printf("Couldn't open input stream.\\n");
174. return \-1;
175. \}
176. \#else
177. show\_avfoundation\_device();
178. //Mac
179. AVInputFormat \*ifmt=av\_find\_input\_format("avfoundation");
180. //Avfoundation
181. //\[video\]:\[audio\]
182. if(avformat\_open\_input(&pFormatCtx,"1",ifmt,NULL)!=0)\{
183. printf("Couldn't open input stream.\\n");
184. return \-1;
185. \}
186. \#endif
187. 
188. if(avformat\_find\_stream\_info(pFormatCtx,NULL)<0)
189. \{
190. printf("Couldn't find stream information.\\n");
191. return \-1;
192. \}
193. videoindex=-1;
194. for(i=0; i<pFormatCtx->nb\_streams; i++)
195. if(pFormatCtx->streams\[i\]->codec->codec\_type==AVMEDIA\_TYPE\_VIDEO)
196. \{
197. videoindex=i;
198. break;
199. \}
200. if(videoindex==-1)
201. \{
202. printf("Didn't find a video stream.\\n");
203. return \-1;
204. \}
205. pCodecCtx=pFormatCtx->streams\[videoindex\]->codec;
206. pCodec=avcodec\_find\_decoder(pCodecCtx->codec\_id);
207. if(pCodec==NULL)
208. \{
209. printf("Codec not found.\\n");
210. return \-1;
211. \}
212. if(avcodec\_open2(pCodecCtx, pCodec,NULL)<0)
213. \{
214. printf("Could not open codec.\\n");
215. return \-1;
216. \}
217. AVFrame \*pFrame,\*pFrameYUV;
218. pFrame=av\_frame\_alloc();
219. pFrameYUV=av\_frame\_alloc();
220. //uint8\_t \*out\_buffer=(uint8\_t \*)av\_malloc(avpicture\_get\_size(PIX\_FMT\_YUV420P, pCodecCtx->width, pCodecCtx->height));
221. //avpicture\_fill((AVPicture \*)pFrameYUV, out\_buffer, PIX\_FMT\_YUV420P, pCodecCtx->width, pCodecCtx->height);
222. //SDL----------------------------
223. if(SDL\_Init(SDL\_INIT\_VIDEO | SDL\_INIT\_AUDIO | SDL\_INIT\_TIMER)) \{
224. printf( "Could not initialize SDL - %s\\n", SDL\_GetError());
225. return \-1;
226. \}
227. int screen\_w=640,screen\_h=360;
228. const SDL\_VideoInfo \*vi = SDL\_GetVideoInfo();
229. //Half of the Desktop's width and height.
230. screen\_w = vi->current\_w/2;
231. screen\_h = vi->current\_h/2;
232. SDL\_Surface \*screen;
233. screen = SDL\_SetVideoMode(screen\_w, screen\_h, 0,0);
234. 
235. if(!screen) \{
236. printf("SDL: could not set video mode - exiting:%s\\n",SDL\_GetError());
237. return \-1;
238. \}
239. SDL\_Overlay \*bmp;
240. bmp = SDL\_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,SDL\_YV12\_OVERLAY, screen);
241. SDL\_Rect rect;
242. rect.x = 0;
243. rect.y = 0;
244. rect.w = screen\_w;
245. rect.h = screen\_h;
246. //SDL End------------------------
247. int ret, got\_picture;
248. 
249. AVPacket \*packet=(AVPacket \*)av\_malloc(sizeof(AVPacket));
250. 
251. \#if OUTPUT\_YUV420P 
252. FILE \*fp\_yuv=fopen("output.yuv","wb+");
253. \#endif 
254. 
255. struct SwsContext \*img\_convert\_ctx;
256. img\_convert\_ctx = sws\_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix\_fmt, pCodecCtx->width, pCodecCtx->height, PIX\_FMT\_YUV420P, SWS\_BICUBIC, NULL, NULL, NULL);
257. //------------------------------
258. SDL\_Thread \*video\_tid = SDL\_CreateThread(sfp\_refresh\_thread,NULL);
259. //
260. SDL\_WM\_SetCaption("Simplest FFmpeg Grab Desktop",NULL);
261. //Event Loop
262. SDL\_Event event;
263. 
264. for (;;) \{
265. //Wait
266. SDL\_WaitEvent(&event);
267. if(event.type==SFM\_REFRESH\_EVENT)\{
268. //------------------------------
269. if(av\_read\_frame(pFormatCtx, packet)>=0)\{
270. if(packet->stream\_index==videoindex)\{
271. ret = avcodec\_decode\_video2(pCodecCtx, pFrame, &got\_picture, packet);
272. if(ret < 0)\{
273. printf("Decode Error.\\n");
274. return \-1;
275. \}
276. if(got\_picture)\{
277. SDL\_LockYUVOverlay(bmp);
278. pFrameYUV->data\[0\]=bmp->pixels\[0\];
279. pFrameYUV->data\[1\]=bmp->pixels\[2\];
280. pFrameYUV->data\[2\]=bmp->pixels\[1\];
281. pFrameYUV->linesize\[0\]=bmp->pitches\[0\];
282. pFrameYUV->linesize\[1\]=bmp->pitches\[2\];
283. pFrameYUV->linesize\[2\]=bmp->pitches\[1\];
284. sws\_scale(img\_convert\_ctx, (const uint8\_t\* const\*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
285. 
286. \#if OUTPUT\_YUV420P 
287. int y\_size=pCodecCtx->width\*pCodecCtx->height;
288. fwrite(pFrameYUV->data\[0\],1,y\_size,fp\_yuv); //Y 
289. fwrite(pFrameYUV->data\[1\],1,y\_size/4,fp\_yuv); //U 
290. fwrite(pFrameYUV->data\[2\],1,y\_size/4,fp\_yuv); //V 
291. \#endif 
292. SDL\_UnlockYUVOverlay(bmp);
293. 
294. SDL\_DisplayYUVOverlay(bmp, &rect);
295. 
296. \}
297. \}
298. av\_free\_packet(packet);
299. \}else\{
300. //Exit Thread
301. thread\_exit=1;
302. break;
303. \}
304. \}else if(event.type==SDL\_QUIT)\{
305. thread\_exit=1;
306. break;
307. \}
308. 
309. \}
310. 
311. 
312. sws\_freeContext(img\_convert\_ctx);
313. 
314. \#if OUTPUT\_YUV420P 
315. fclose(fp\_yuv);
316. \#endif 
317. 
318. SDL\_Quit();
319. 
320. //av\_free(out\_buffer);
321. av\_free(pFrameYUV);
322. avcodec\_close(pCodecCtx);
323. avformat\_close\_input(&pFormatCtx);
324. 
325. return 0;
326. \}

## 结果 ##

程序的运行效果如下。这个运行结果还是十分有趣的，会出现一个屏幕“嵌套”在另一个屏幕里面的现象，环环相套。

![SouthEast][]

可以通过代码定义的宏来确定是否将解码后的YUV420P数据输出成文件：

**\[cpp\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  \#define OUTPUT\_YUV420P 0

可以通过下面的宏定义来确定使用GDIGrab或者是Dshow打开摄像头：

**\[cpp\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  //'1' Use Dshow 
2.  //'0' Use GDIgrab
3.  \#define USE\_DSHOW 0

##      下载 ##

**Simplest FFmpeg Device**

**项目主页**

SourceForge：[https://sourceforge.net/projects/simplestffmpegdevice/][https_sourceforge.net_projects_simplestffmpegdevice]

Github：[https://github.com/leixiaohua1020/simplest\_ffmpeg\_device][https_github.com_leixiaohua1020_simplest_ffmpeg_device]

开源中国：[http://git.oschina.net/leixiaohua1020/simplest\_ffmpeg\_device][http_git.oschina.net_leixiaohua1020_simplest_ffmpeg_device]

CSDN下载地址：  
[http://download.csdn.net/detail/leixiaohua1020/7994049][http_download.csdn.net_detail_leixiaohua1020_7994049]

注：  
本工程包含两个基于FFmpeg的libavdevice的例子：  
simplest\_ffmpeg\_grabdesktop：屏幕录制。  
simplest\_ffmpeg\_readcamera：读取摄像头

**更新-1.1（2015.1.9）=========================================**

该版本中，修改了SDL的显示方式，弹出的窗口可以移动了。

CSDN下载地址：[http://download.csdn.net/detail/leixiaohua1020/8344695][http_download.csdn.net_detail_leixiaohua1020_8344695]

**更新-1.2 (2015.2.13)=========================================**

这次考虑到了跨平台的要求，调整了源代码。经过这次调整之后，源代码可以在以下平台编译通过：

> *VC++：打开sln文件即可编译，无需配置。*

> *cl.exe：打开compile\_cl.bat即可命令行下使用cl.exe进行编译，注意可能需要按照VC的安装路径调整脚本里面的参数。编译命令如下。*

**\[plain\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  ::VS2010 Environment
2.  call "D:\\Program Files\\Microsoft Visual Studio 10.0\\VC\\vcvarsall.bat"
3.  ::include
4.  @set INCLUDE=include;%INCLUDE%
5.  ::lib
6.  @set LIB=lib;%LIB%
7.  ::compile and link
8.  cl simplest\_ffmpeg\_grabdesktop.cpp /MD /link SDL.lib SDLmain.lib avcodec.lib ^
9.  avformat.lib avutil.lib avdevice.lib avfilter.lib postproc.lib swresample.lib swscale.lib ^
10. /SUBSYSTEM:WINDOWS /OPT:NOREF

> *MinGW：MinGW命令行下运行compile\_mingw.sh即可使用MinGW的g++进行编译。编译命令如下。*

**\[plain\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  g++ simplest\_ffmpeg\_grabdesktop.cpp -g -o simplest\_ffmpeg\_grabdesktop.exe \\
2.  \-I /usr/local/include -L /usr/local/lib \\
3.  \-lmingw32 -lSDLmain -lSDL -lavformat -lavcodec -lavutil -lavdevice -lswscale

> *GCC(Linux)：Linux命令行下运行compile\_gcc.sh即可使用GCC进行编译。编译命令如下。*

**\[plain\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  gcc simplest\_ffmpeg\_grabdesktop.cpp -g -o simplest\_ffmpeg\_grabdesktop.out \\
2.  \-I /usr/local/include -L /usr/local/lib -lSDLmain -lSDL -lavformat -lavcodec -lavutil -lavdevice -lswscale

> *GCC(MacOS)：MacOS命令行下运行compile\_gcc\_mac.sh即可使用GCC进行编译。Mac的GCC和Linux的GCC差别不大，但是使用SDL1.2的时候，必须加上“-framework Cocoa”参数，否则编译无法通过。编译命令如下。*

**\[plain\]** [ view plain][view plain] [ copy][view plain]  [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  gcc simplest\_ffmpeg\_grabdesktop.cpp -g -o simplest\_ffmpeg\_grabdesktop.out \\
2.  \-framework Cocoa -I /usr/local/include -L /usr/local/lib -lSDLmain -lSDL -lavformat -lavcodec -lavutil -lavdevice -lswscale

PS：相关的编译命令已经保存到了工程文件夹中  
  
  
CSDN下载地址：[http://download.csdn.net/detail/leixiaohua1020/8445747][http_download.csdn.net_detail_leixiaohua1020_8445747]

SourceForge上已经更新。

[FFmpeg_AVDevice]: http://blog.csdn.net/leixiaohua1020/article/details/39702113
[FFmpeg_AVDevice 1]: http://blog.csdn.net/leixiaohua1020/article/details/39706721
[100_FFMPEG_SDL_SDL1.x]: http://blog.csdn.net/leixiaohua1020/article/details/8652605
[view plain]: http://blog.csdn.net/leixiaohua1020/article/details/39706721#
[CODE]: https://code.csdn.net/assets/CODE_ico.png
[CODE_CODE]: https://code.csdn.net/snippets/478670
[ico_fork.svg]: https://code.csdn.net/assets/ico_fork.svg
[ico_fork.svg 1]: https://code.csdn.net/snippets/478670/fork
[http_sourceforge.net_projects_screencapturer]: http://sourceforge.net/projects/screencapturer/
[FFmpeg_DirectShow_]: http://blog.csdn.net/leixiaohua1020/article/details/38284961
[SouthEast]: /images/20220731/f110c817fc404236841e1a7768f34ad6.png
[https_sourceforge.net_projects_simplestffmpegdevice]: https://sourceforge.net/projects/simplestffmpegdevice/
[https_github.com_leixiaohua1020_simplest_ffmpeg_device]: https://github.com/leixiaohua1020/simplest_ffmpeg_device
[http_git.oschina.net_leixiaohua1020_simplest_ffmpeg_device]: http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_device
[http_download.csdn.net_detail_leixiaohua1020_7994049]: http://download.csdn.net/detail/leixiaohua1020/7994049
[http_download.csdn.net_detail_leixiaohua1020_8344695]: http://download.csdn.net/detail/leixiaohua1020/8344695
[http_download.csdn.net_detail_leixiaohua1020_8445747]: http://download.csdn.net/detail/leixiaohua1020/8445747