优化视频解析代码；修改拉流方式为UDP

Src/Video/cffmpeg_decode.cpp

@@ -1,5 +1,6 @@
 #include "cffmpeg_decode.h"
-Cffmpeg_decode::Cffmpeg_decode() {
+// Cffmpeg_decode::Cffmpeg_decode() {
+Cffmpeg_decode::Cffmpeg_decode(QObject *parent) : QObject(parent) {
   fmtCtx = avformat_alloc_context();
   pkt = av_packet_alloc();
   yuvFrame = av_frame_alloc();
@@ -31,10 +32,10 @@ bool Cffmpeg_decode::open_input_file() {
   // 设置缓存大小，1080p可将值调大
   av_dict_set(&avdic, "buffer_size", "2048000", 0);
   // 以udp方式打开，如果以tcp方式打开将udp替换为tcp
-  av_dict_set(&avdic, "rtsp_transport", "tcp", 0);
+  av_dict_set(&avdic, "rtsp_transport", "udp", 0);
   // 设置超时断开连接时间，单位微秒//listen_timeout
-  // av_dict_set(&avdic, "listen_timeout", "200000", 0);
+  av_dict_set(&avdic, "listen_timeout", "200000", 0);
-  av_dict_set(&avdic, "stimeout", "200000", 0);
+  // av_dict_set(&avdic, "stimeout", "200000", 0);
   av_dict_set(&avdic, "max_delay", "3", 0); // 设置最大时延
   av_dict_set(&avdic, "tune", "zerolatency", 0);
   av_dict_set(&avdic, "preset", "ultrafast", 0);

Src/Video/cffmpeg_decode.h

@@ -27,10 +27,12 @@ extern "C" {
 
 // class Cffmpeg_decode: public QThread
 class Cffmpeg_decode : public QObject {
+  Q_OBJECT
 public:
-  explicit Cffmpeg_decode();
+  // explicit Cffmpeg_decode();
+  Cffmpeg_decode(QObject *parent = nullptr);
   ~Cffmpeg_decode();
-  Q_OBJECT
+
 public:
   void setUrl(QString url);
   bool open_input_file();