Ffmpeg calls avformat_ open_ Error -22 returned during input (invalid argument)

One FFmpeg Report a mistake -22（Invalid argument）

This mistake really wasted my night , Why? , Because I open rtsp The address of can be played , But instead http://xxx/HD.live.mp4?auth_key=xxx After this address with authentication , Report illegal parameters .
Cut a long story short , The reason for this error may be ：

• 1）err = avformat_open_input(&ic, is->_filename.c_str(), is->_iformat, &is->_format_opts); Of _filename The file name is incorrect .
• 2） No call av_register_all().
• 3）ffmpeg Wrong version .

The first 1 It's quite common , But what I want to say is that I didn't cause it this time , It is ffmpeg Wrong version , Because I tried to call av_register_all(), But still not , And I have confirmed that the stream address is vlc And my own other broadcasts demo No problem .
So how did I guess it might be ffmpeg The problem of the version Library ,

• 1） Because I can play it myself demo It's the same code as the error report , The only difference is ffmpeg Version Library , So I try to replace the Library , The result is good .
• 2） And it's wrong ffmpeg The version can be opened rtsp Address and play , But instead http://xxx/HD.live.mp4?auth_key=xxx After this address with authentication , Report illegal parameters . It is estimated that this version is not accurate in parsing some characters , For example, with a question mark 、 Equal sign, etc , You can see the source code by yourself .

Wrong version ：ffmpeg-4.3.1,64 position ( I downloaded this from the official website ). Switch to ffmpeg-4.2.1,64 It's no problem ( This is compiled by my own source code ).