原本只能輸出成 %4d.mp4 ==> 0000.mp4, 0001.mp4
要改成可以像行車紀錄器般的檔案格式 201405020248.mp4
增加 %t 的參數
ffmpeg -i input -f segment -segment_time 60 -reset_timestamps 1 %t.mp4
這邊將 %t.mp4 定義成 Webcam年日月/E年日月時分秒.mp4
strftime(buf1, sizeof(buf1), “WebCam%Y%m%d/E%Y%m%d%H%M%S”, localtime(&tv.tv_sec));
修改方式如下：
修改 ffmpeg source / libavformat / utils.c 檔案
增加引用 #include <sys/time.h>
尋找 av_get_frame_filename function
替換成下面這一個
int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
{
const char *p;
char *q, buf1[50], c;
int nd, len, percentd_found, percentt_found;
struct timeval tv;
q = buf;
p = path;
percentd_found = 0;
percentt_found = 0;
for (;;) {
c = *p++;
if (c == ' ')
break;
if (c == '%') {
do {
nd = 0;
while (av_isdigit(*p))
nd = nd * 10 + *p++ - '0';
c = *p++;
} while (av_isdigit(c));
switch (c) {
case '%':
goto addchar;
case 'd':
if (percentd_found)
goto fail;
percentd_found = 1;
snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
len = strlen(buf1);
if ((q - buf + len) > buf_size - 1)
goto fail;
memcpy(q, buf1, len);
q += len;
break;
case 't':
if (percentt_found)
goto fail;
percentt_found = 1;
gettimeofday(&tv, NULL);
//strftime(buf1, sizeof(buf1), "%Y-%m-%d_%H-%M-%S", localtime(&tv.tv_sec));
//
strftime(buf1, sizeof(buf1), "WebCam%Y%m%d/E%Y%m%d%H%M%S", localtime(&tv.tv_sec));
len = strlen(buf1);
if ((q - buf + len) > buf_size - 1)
goto fail;
memcpy(q, buf1, len);
q += len;
break;
default:
goto fail;
}
} else {
addchar:
if ((q - buf) < buf_size - 1)
*q++ = c;
}
}
if (!percentd_found && !percentt_found)
goto fail;
*q = ' ';
return 0;
fail:
*q = ' ';
return -1;
}