all logging messages are sent to* stderr. This behavior can be altered by setting a different logging callback* function.* @see av_log_set_callback** @param avcl A pointer to an arbitrary struct of which the first field is a* pointer to an ...
void av_log_set_callback(void(*)(void *, int, const char *, va_list) callback) 设置日志打印的回调。 av_log 函数原型: void av_log(void* avcl, int level, const char *fmt, ...) 输出日志。 av_malloc av_malloc()就是简单的封装了系统函数malloc(),并做了一些错误检查工作。 avformat_...
all logging messages are sent to * stderr. This behavior can be altered by setting a different logging callback * function. *@seeav_log_set_callback * *@paramavcl A pointer to an arbitrary struct of which the first field is a * pointer ...
av_log_set_callback(FFmpegLogFunc); 使用说明 av_log(NULL, AV_LOG_WARNING, "start to write oneline to test av_log\n"); 日志回调函数调整 1)选择性的打印,代码如下 void FFmpegLogFunc(voidptr, int level, const charfmt,va_list vl) { FILE *fp = fopen("ffmpeglog.txt","a+"); if(leve...
av_log()会最终调用fprintf(stderr,…)函数将日志内容输出到命令行界面上。但是在一些非命令行程序(MFC程序,Android程序等)中,av_log()调用的fprintf(stderr,…)就无法将日志内容显示出来了。对于这种情况,FFmpeg提供了日志回调函数av_log_set_callback()。该函数可以指定一个自定义的日志输出函数,将日志输出到...
FFmpeg av_log_set_callback函数使用 简介 AVLog是FFmpeg的日志输出工具。在FFmpeg中所有的日志输出不是通过printf()函数而是通过av_log()函数。av_log()会最终调用fprintf(stderr,…)函数将日志内容输出到命令行界面上。但是在一些非命令行程序(MFC程序,Android程序等)中,av_log()调用的fprintf(stderr,…)就...
* @see av_log_set_callback * * @param avcl A pointer to an arbitrary struct of which the first field is a * pointer to an AVClass struct or NULL if general log. * @param level The importance level of the message expressed using a @ref ...
从代码中可以看出,av_log_callback指针默认指向一个函数av_log_default_callback()。av_log_default_callback()即FFmpeg默认的Log函数。需要注意的是,这个Log函数是可以自定义的。按照指定的参数定义一个自定义的函数后,可以通过FFmpeg的另一个API函数av_log_set_callback()设定为Log函数。 av_log_set_callbac...
* @see av_log_set_callback * * @param avcl A pointer to an arbitrary struct of which the first field is a * pointer to an AVClass struct. * @param level The importance level of the message expressed using a @ref * lavu_log_constants "Logging Constant". ...
* @see av_log_set_callback * * @param avcl A pointer to an arbitrary struct of which the first field is a * pointer to an AVClass struct or NULL if general log. * @param level The importance level of the message expressed using a @ref ...