ffmpeg实现视频实时动态时间水印

素颜马尾好姑娘i 2023-05-29 02:45 2阅读 0赞

[https://blog.csdn.net/bixinwei22/article/details/94454258][https_blog.csdn.net_bixinwei22_article_details_94454258]

首先看下效果

左上角的实时当前时间，纯c完成。下面的是hello ffmpeg字样是avfilter的drawtext实现。

动态时间水印，其实ffmpeg有命令可以实现，不过我在windows下发现用不了，而且转换出来的图片会质量变差。

所以想着自己用C去实现。上面的2019-07-02 16:30:46 这些是在android下，用canvas drawtext每一个字符，然后生产对应的

bitmap,然后从bitmap里面提取出rgb数据，然后转出来yuv的y数据,因为我们只需要黑白两种颜色，所以使用y足够了。

avfilter我的博客还没有讲过，以后有时间再讲。

下面上代码

\#include <stdio.h>  
\#include <stdlib.h>  
\#include <string>  
\#include <iostream>  
extern "C" \{  
  
\#include "libavcodec/avcodec.h"  
\#include "libavformat/avformat.h"  
\#include "libswscale/swscale.h"  
\#include "libswresample/swresample.h"  
\#include "libavutil/time.h"  
\#include "libswresample/swresample.h"  
\#include "libavutil/audio\_fifo.h"  
\#include "libavutil/avutil.h"  
\#include "libavutil/opt.h"  
\#include "libavfilter/avfilter.h"  
\#include "libavfilter/avfiltergraph.h"  
\#include "libavfilter/buffersink.h"  
\#include "libavfilter/buffersrc.h"  
\}  
using namespace std;  
void Init()  
\{  
av\_register\_all();  
avfilter\_register\_all();  
avformat\_network\_init();  
//av\_log\_set\_level(AV\_LOG\_ERROR);  
\}  
  
AVFilterGraph \* filter\_graph = nullptr;  
AVFilterContext \*buffersink\_ctx = nullptr;;  
AVFilterContext \*buffersrc\_ctx = nullptr;;  
  
AVFormatContext \* ifmt\_ctx = NULL;  
AVFormatContext \* ofmt\_ctx = NULL;  
AVStream \*ist\_v = NULL;  
AVCodecContext \* ic\_ctx\_v = NULL;  
int iv\_index = -1;  
AVStream \*ost\_v = NULL;  
AVCodecContext \* oc\_ctx\_v = NULL;  
  
char \*mNumArrays;  
int num\_width = 17;  
int num\_height = 23;  
int off\_x = 18; int off\_y = 18;  
int patternLen;  
int getIndex(char c) \{  
if (c >= '0' && c <= '9')  
return c - '0';  
else if (c == '-')  
return 10;  
else if (c == ' ')  
return 11;  
else if (c == ':')  
return 12;  
return 11;  
\}  
void initWatemake() \{  
  
char pattern\[\] = "yyyy-MM-dd HH:mm:ss";  
patternLen = sizeof(pattern);  
mNumArrays = (char\*)malloc(num\_width \* num\_height\*patternLen);  
char NUM\_0\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,0,0,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,1,1,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,1,1,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,1,1,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,1,1,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,1,1,1,0,0,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_1\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_2\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_3\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_4\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,0,0,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_5\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_6\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_7\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_8\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_9\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_SPACE\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_COLON\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
char NUM\_LINE\[\] = \{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 \};  
int size = num\_width \* num\_height;  
memcpy(mNumArrays, NUM\_0, size);  
memcpy(mNumArrays + size \* 1, NUM\_1, size);  
memcpy(mNumArrays + size \* 2, NUM\_2, size);  
memcpy(mNumArrays + size \* 3, NUM\_3, size);  
memcpy(mNumArrays + size \* 4, NUM\_4, size);  
memcpy(mNumArrays + size \* 5, NUM\_5, size);  
memcpy(mNumArrays + size \* 6, NUM\_6, size);  
memcpy(mNumArrays + size \* 7, NUM\_7, size);  
memcpy(mNumArrays + size \* 8, NUM\_8, size);  
memcpy(mNumArrays + size \* 9, NUM\_9, size);  
memcpy(mNumArrays + size \* 10, NUM\_LINE, size);  
memcpy(mNumArrays + size \* 11, NUM\_SPACE, size);  
memcpy(mNumArrays + size \* 12, NUM\_COLON, size);  
\}  
  
int InitDecodeCodec(AVCodecID codecId)  
\{  
auto codec = avcodec\_find\_decoder(codecId);  
if (!codec)  
\{  
return -1;  
\}  
  
if (codec->capabilities & CODEC\_CAP\_TRUNCATED)  
ic\_ctx\_v->flags |= CODEC\_FLAG\_TRUNCATED;  
int ret = avcodec\_open2(ic\_ctx\_v, codec, NULL);  
if (ret < 0) \{  
cout << "open input vcodec failed" << endl;  
\}  
return ret;  
  
\}  
  
int OpenInput(char \*filename)  
\{  
ifmt\_ctx = avformat\_alloc\_context();  
  
  
int ret = avformat\_open\_input(&ifmt\_ctx, filename, NULL, NULL);  
if (ret < 0)  
\{  
return ret;  
\}  
ret = avformat\_find\_stream\_info(ifmt\_ctx, NULL);  
av\_dump\_format(ifmt\_ctx, 0, filename, 0);  
if (ret >= 0)  
\{  
cout << "open input stream successfully" << endl;  
\}  
for (int i = 0; i < ifmt\_ctx->nb\_streams; i++) \{  
if (ifmt\_ctx->streams\[i\]->codec->codec\_type == AVMEDIA\_TYPE\_VIDEO) \{  
iv\_index = i;  
ist\_v = ifmt\_ctx->streams\[i\];  
ic\_ctx\_v = ist\_v->codec;  
\}  
  
\}  
InitDecodeCodec(ic\_ctx\_v->codec\_id);  
return ret;  
\}  
  
  
  
int InitEncoderCodec(int dstW, int dstH)  
\{  
AVCodec \* pH264Codec = avcodec\_find\_encoder(AV\_CODEC\_ID\_H264);  
if (NULL == pH264Codec)  
\{  
cout << "find output vcodec failed" << endl;  
return -1;  
\}  
oc\_ctx\_v = avcodec\_alloc\_context3(pH264Codec);  
oc\_ctx\_v->gop\_size = ic\_ctx\_v->gop\_size;  
oc\_ctx\_v->has\_b\_frames = 0;  
oc\_ctx\_v->max\_b\_frames = 0;  
oc\_ctx\_v->codec\_id = pH264Codec->id;  
oc\_ctx\_v->time\_base.num = ic\_ctx\_v->time\_base.num;;  
oc\_ctx\_v->time\_base.den = ic\_ctx\_v->time\_base.den;;  
oc\_ctx\_v->pix\_fmt = \*pH264Codec->pix\_fmts;  
oc\_ctx\_v->width = dstW;  
oc\_ctx\_v->height = dstH;  
  
oc\_ctx\_v->codec\_tag = 0;  
// some formats want stream headers to be separate  
if (ofmt\_ctx->oformat->flags & AVFMT\_GLOBALHEADER)  
oc\_ctx\_v->flags |= CODEC\_FLAG\_GLOBAL\_HEADER;  
  
int ret = avcodec\_open2(oc\_ctx\_v, pH264Codec, NULL);  
if (ret < 0)  
\{  
cout << "open output vcodec failed" << endl;  
return ret;  
\}  
ost\_v = avformat\_new\_stream(ofmt\_ctx, oc\_ctx\_v->codec);  
ost\_v->codec = oc\_ctx\_v;  
  
return 1;  
\}  
  
  
  
int OpenOutput(char \*fileName)  
\{  
int ret = 0;  
ret = avformat\_alloc\_output\_context2(&ofmt\_ctx, NULL, "flv", fileName);  
if (ret < 0)  
\{  
goto Error;  
\}  
ret = avio\_open2(&ofmt\_ctx->pb, fileName, AVIO\_FLAG\_READ\_WRITE, NULL, NULL);  
if (ret < 0)  
\{  
goto Error;  
\}  
//InitEncoderCodec(640,480);  
InitEncoderCodec(ic\_ctx\_v->width, ic\_ctx\_v->height);  
//InitEncoderCodec(ic\_ctx\_v->width\*1/2, ic\_ctx\_v->height\*1/2);  
  
  
av\_dump\_format(ofmt\_ctx, 0, fileName, 1);  
ret = avformat\_write\_header(ofmt\_ctx, NULL);  
if (ret < 0)  
\{  
goto Error;  
\}  
if (ret >= 0)  
cout << "open output stream successfully" << endl;  
return ret;  
Error:  
if (ofmt\_ctx)  
\{  
avformat\_close\_input(&ofmt\_ctx);  
\}  
return ret;  
\}  
  
void CloseInput()  
\{  
if (ifmt\_ctx)  
\{  
avformat\_close\_input(&ifmt\_ctx);  
\}  
\}  
  
void CloseOutput()  
\{  
if (ofmt\_ctx)  
\{  
avcodec\_close(oc\_ctx\_v);  
avformat\_close\_input(&ofmt\_ctx);  
\}  
\}  
  
int InitFilter(AVCodecContext \* codecContext)  
\{  
char args\[512\];  
int ret = 0;  
  
AVFilter \*buffersrc = avfilter\_get\_by\_name("buffer");  
AVFilter \*buffersink = avfilter\_get\_by\_name("buffersink");  
AVFilterInOut \*outputs = avfilter\_inout\_alloc();  
AVFilterInOut \*inputs = avfilter\_inout\_alloc();  
//string filters\_descr = "scale=640:480";  
//string filters\_descr = "movie=my\_logo.png\[wm\];\[in\]\[wm\]overlay=5:5\[out\]";  
//string filters\_descr = "drawtext=fontfile=arial.ttf:fontcolor=white:fontsize=36:text='Lei Xiaohua':x=20:y=20";  
//string filters\_descr = "drawbox=x=100:y=100:w=100:h=100:color=pink@0.5";//画正方形  
//string filters\_descr = "crop=1/2\*in\_w:1/2\*in\_h:0:0";  
  
string filters\_descr = "drawtext=fontfile=FreeSerif1.ttf:fontcolor=white:fontsize=36:text='Hello FFmpeg':x=18:y=200";  
  
//const char \*filter\_descr = "lutyuv='u=128:v=128'";  
//const char \*filter\_descr = "boxblur";  
//const char \*filter\_descr = "hflip";  
//const char \*filter\_descr = "hue='h=60:s=-3'";  
//const char \*filter\_descr = "crop=2/3\*in\_w:2/3\*in\_h";  
//const char \*filter\_descr = "drawbox=x=100:y=100:w=100:h=100:color=pink@0.5";  
//const char \*filter\_descr = "drawtext=fontfile=arial.ttf:fontcolor=green:fontsize=30:text='Lei Xiaohua'";  
  
enum AVPixelFormat pix\_fmts\[\] = \{ AV\_PIX\_FMT\_YUV420P, AV\_PIX\_FMT\_NONE \};  
  
filter\_graph = avfilter\_graph\_alloc();  
if (!outputs || !inputs || !filter\_graph) \{  
ret = AVERROR(ENOMEM);  
goto end;  
\}  
  
/\* buffer video source: the decoded frames from the decoder will be inserted here. \*/  
sprintf\_s(args, sizeof(args),  
"video\_size=%dx%d:pix\_fmt=%d:time\_base=%d/%d:pixel\_aspect=%d/%d",  
codecContext->width, codecContext->height, codecContext->pix\_fmt,  
codecContext->time\_base.num, codecContext->time\_base.den,  
codecContext->sample\_aspect\_ratio.num, codecContext->sample\_aspect\_ratio.den);  
  
ret = avfilter\_graph\_create\_filter(&buffersrc\_ctx, buffersrc, "in",  
args, NULL, filter\_graph);  
if (ret < 0) \{  
printf("Cannot create buffer source\\n");  
goto end;  
\}  
  
/\* buffer video sink: to terminate the filter chain. \*/  
ret = avfilter\_graph\_create\_filter(&buffersink\_ctx, buffersink, "out",  
NULL, NULL, filter\_graph);  
if (ret < 0) \{  
printf("Cannot create buffer sink\\n");  
goto end;  
\}  
  
ret = av\_opt\_set\_int\_list(buffersink\_ctx, "pix\_fmts", pix\_fmts,  
AV\_PIX\_FMT\_YUV420P, AV\_OPT\_SEARCH\_CHILDREN);  
if (ret < 0) \{  
printf("Cannot set output pixel format\\n");  
goto end;  
\}  
  
/\* Endpoints for the filter graph. \*/  
outputs->name = av\_strdup("in");  
outputs->filter\_ctx = buffersrc\_ctx;  
outputs->pad\_idx = 0;  
outputs->next = NULL;  
  
inputs->name = av\_strdup("out");  
inputs->filter\_ctx = buffersink\_ctx;  
inputs->pad\_idx = 0;  
inputs->next = NULL;  
if ((ret = avfilter\_graph\_parse\_ptr(filter\_graph, filters\_descr.c\_str(),  
&inputs, &outputs, NULL)) < 0) \{  
printf("avfilter\_graph\_parse\_ptr failed\\n");  
goto end;  
\}  
  
  
if ((ret = avfilter\_graph\_config(filter\_graph, NULL)) < 0) \{  
printf("avfilter\_graph\_config failed\\n");  
goto end;  
\}  
  
return ret;  
end:  
avfilter\_inout\_free(&inputs);  
avfilter\_inout\_free(&outputs);  
return ret;  
\}  
  
  
  
  
void addwatemake(char\* y,int count,time\_t \*t,int bigwidth) \{  
struct tm \*tm\_now = localtime(t);  
if (count % 25 == 0) \{  
(\*t) +=1;  
\}  
char tmp\[64\] = \{ 0 \};  
strftime(tmp, sizeof(tmp), "%Y-%m-%d %X", tm\_now);  
char\* tmdate = (char\*)malloc(patternLen);//2019-07-01 10:17:23  
memset(tmdate, 0, patternLen);  
memcpy(tmdate, tmp, patternLen - 1);  
int size = num\_width \* num\_height;  
char \*start = y + off\_y \* bigwidth + off\_x;  
for (int i = 0; i < patternLen; i++) \{  
int index = getIndex(\*(tmdate + i));  
char \*num = mNumArrays + size \* index;  
  
for (int j = 0; j < num\_height; j++) \{  
char \*destIndex = start + i \* num\_width;  
  
for (int k = 0; k < num\_width; k++) \{  
if (\*(num + j \* num\_width + k) == 1) \{  
\*(destIndex + j \* bigwidth + k) = 235;//水印文字颜色，235为白色，16为黑色  
\}  
\}  
\}  
\}  
free(tmdate);  
  
\}  
  
  
  
int main(int argc, char\* argv\[\]) \{  
int ret;  
string fileInput = "love\_360p.flv";  
string fileOutput = "out.flv";  
Init();  
  
  
if (OpenInput((char \*)fileInput.c\_str()) < 0)  
\{  
cout << "Open file Input failed!" << endl;  
  
return 0;  
\}  
if (OpenOutput((char \*)fileOutput.c\_str()) < 0)  
\{  
cout << "Open file Output failed!" << endl;  
  
return 0;  
\}  
ret = InitFilter(ic\_ctx\_v);  
  
AVFrame\* filterFrame = av\_frame\_alloc();  
AVPacket\* packet = (AVPacket\*)av\_malloc(sizeof(AVPacket));  
av\_init\_packet(packet);  
packet->data = NULL;  
packet->size = 0;  
int packetCount = 0;  
  
initWatemake();  
time\_t t = time(0);  
int count = 0;  
char\* testdata = (char\*)malloc(640 \* 360);  
memset(testdata, 0, 640 \* 360);  
AVFrame\* pSrcFrame2 = av\_frame\_alloc();  
/\*uint8\_t \*video\_data\_buffer = NULL;  
video\_data\_buffer = new uint8\_t\[avpicture\_get\_size(ic\_ctx\_v->pix\_fmt, ic\_ctx\_v->width, ic\_ctx\_v->height)\];  
avpicture\_fill((AVPicture \*)pSrcFrame2, video\_data\_buffer, ic\_ctx\_v->pix\_fmt, ic\_ctx\_v->width, ic\_ctx\_v->height);  
\*/  
  
while (1)  
\{  
ret = av\_read\_frame(ifmt\_ctx, packet);  
if (ret < 0) \{  
break;  
\}  
if (packet->stream\_index != iv\_index) \{  
continue;  
\}  
  
int got\_frame = 0;  
AVFrame\* pSrcFrame = av\_frame\_alloc();  
  
ret = avcodec\_decode\_video2(ic\_ctx\_v, pSrcFrame, &got\_frame, packet);  
if (ret < 0) \{  
printf("Error decoding video\\n");  
break;  
\}  
if (got\_frame) \{  
count++;  
  
memcpy(testdata, pSrcFrame->data\[0\], 640 \* 360);  
  
addwatemake(testdata, count, &t, ic\_ctx\_v->width);  
  
av\_frame\_ref(pSrcFrame2, pSrcFrame);  
memcpy(pSrcFrame2->data\[0\], testdata, 640 \* 360);  
  
pSrcFrame2->pts = av\_frame\_get\_best\_effort\_timestamp(pSrcFrame);  
/\* push the decoded frame into the filtergraph \*/  
if (av\_buffersrc\_add\_frame\_flags(buffersrc\_ctx, pSrcFrame2, AV\_BUFFERSRC\_FLAG\_KEEP\_REF) < 0) \{  
av\_log(NULL, AV\_LOG\_ERROR, "Error while feeding the filtergraph\\n");  
break;  
\}  
  
/\* pull filtered frames from the filtergraph \*/  
while (1) \{  
ret = av\_buffersink\_get\_frame(buffersink\_ctx, filterFrame);  
if (ret == AVERROR(EAGAIN) || ret == AVERROR\_EOF)  
break;  
if (ret < 0)  
goto end;  
AVPacket \*opkt = (AVPacket \*)av\_malloc(sizeof(AVPacket));  
av\_init\_packet(opkt);  
opkt->data = NULL;  
opkt->size = 0;  
int got\_output;  
filterFrame->pict\_type = AV\_PICTURE\_TYPE\_NONE;  
  
ret = avcodec\_encode\_video2(oc\_ctx\_v, opkt, filterFrame, &got\_output);  
if (ret >= 0 && got\_output)  
\{  
  
packetCount += 40;  
opkt->pts = opkt->dts = packetCount;  
int ret = av\_write\_frame(ofmt\_ctx, opkt);  
\}  
av\_free\_packet(opkt);  
av\_frame\_unref(filterFrame);  
\}  
  
\}  
  
av\_frame\_free(&pSrcFrame);  
  
  
\}  
free(testdata);  
end:  
CloseInput();  
CloseOutput();  
cout << "end!" << endl;  
return 0;  
\}

代码中640，360是我使用的测试视频的宽高，大家可以自己修改，我就懒得改了。

主要讲一个坑点，就是decode出来的frame不要修改它的data，自己去复制一个使用。这就是为什么程序中引入了pSrcFrame2,而不是直接用pSrcFrame。

代码自己琢磨吧，我就不吧啦吧啦了，不懂的留言

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版权声明：本文为CSDN博主「bixinwei」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。  
原文链接：https://blog.csdn.net/bixinwei22/article/details/94454258

[https_blog.csdn.net_bixinwei22_article_details_94454258]: https://blog.csdn.net/bixinwei22/article/details/94454258