问题
'av_register_all': 被声明为已否决
编译错误说明
FFmpeg新版本,例如4.4,该函数已经被废弃。
#if FF_API_NEXT
/**
* Initialize libavformat and register all the muxers, demuxers and
* protocols. If you do not call this function, then you can select
* exactly which formats you want to support.
*
* @see av_register_input_format()
* @see av_register_output_format()
*/
attribute_deprecated
void av_register_all(void);
attribute_deprecated
void av_register_input_format(AVInputFormat *format);
attribute_deprecated
void av_register_output_format(AVOutputFormat *format);
#endif
解决方案
1)打开项目属性页面C/C++,打开常规,SDL检查,选择否(不推荐)
2)直接注释掉就行,新版本不再需要添加该函数
初始化FFmpeg环境,需要调用的函数,分别有
avformat_network_init
avdevice_register_all
函数的具体实现
void av_register_all(void)
{
ff_thread_once(&av_format_next_init, av_format_init_next);
}
static void av_format_init_next(void)
{
AVOutputFormat *prevout = NULL, *out;
AVInputFormat *previn = NULL, *in;
ff_mutex_lock(&avpriv_register_devices_mutex);
for (int i = 0; (out = (AVOutputFormat*)muxer_list[i]); i++) {
if (prevout)
prevout->next = out;
prevout = out;
}
if (outdev_list) {
for (int i = 0; (out = (AVOutputFormat*)outdev_list[i]); i++) {
if (prevout)
prevout->next = out;
prevout = out;
}
}
for (int i = 0; (in = (AVInputFormat*)demuxer_list[i]); i++) {
if (previn)
previn->next = in;
previn = in;
}
if (indev_list) {
for (int i = 0; (in = (AVInputFormat*)indev_list[i]); i++) {
if (previn)
previn->next = in;
previn = in;
}
}
ff_mutex_unlock(&avpriv_register_devices_mutex);
}
将编解码器保存到链表里面
标签:FFmpeg,format,void,register,previn,av,prevout From: https://blog.51cto.com/fengyuzaitu/6217606