尝试修复时间戳回环或乱序导致的问题

src/MediaFile/MP4Muxer.cpp

@@ -107,20 +107,38 @@ void MP4Muxer::onTrackFrame(const Frame::Ptr &frame) {
     if(!track_info.start_dts){
         track_info.start_dts = frame->dts();
     }
-    if(!track_info.start_pts){
-        track_info.start_pts = frame->pts();
-    }
 
     //相对时间戳
-    int dts_inc = frame->dts() - track_info.start_dts;
-    int pts_inc = frame->pts() - track_info.start_pts;
+    int64_t dts_inc = frame->dts() - track_info.start_dts;
+    //pts和dts的差值
+    int pts_dts_diff = frame->pts() - frame->dts();
+    if(pts_dts_diff > 200 || pts_dts_diff < -200){
+        //如果差值大于200毫秒，则认为由于回环导致时间戳错乱了
+        pts_dts_diff = 0;
+    }
+
+    if(dts_inc < track_info.dts_inc){
+        //本次相对时间戳竟然小于上次？
+        if(dts_inc < 0){
+            //时间戳回环,保证下次相对时间戳与本次相对合理增长
+            track_info.start_dts = frame->dts() - track_info.dts_inc;
+            //本次时间戳强制等于上次时间戳+10
+            dts_inc = track_info.dts_inc + 10;
+        }else{
+            //时间戳变小了？,那么取上次时间戳+10
+            dts_inc = track_info.dts_inc + 10;
+        }
+    }
+
+    //保留上次相对时间戳
+    track_info.dts_inc = dts_inc;
 
     mov_writer_write_l(_mov_writter.get(),
                        track_info.track_id,
                        frame->data() + frame->prefixSize(),
                        frame->size() - frame->prefixSize(),
-                       pts_inc >= 0 ? pts_inc : 0,
-                       dts_inc >= 0 ? dts_inc : 0,
+                       pts_dts_diff + dts_inc,
+                       dts_inc,
                        frame->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0,
                        with_nalu_size);
 }

src/MediaFile/MP4Muxer.h

@@ -76,8 +76,8 @@ protected:
 private:
     struct track_info{
         int track_id = -1;
-        uint32_t start_dts = 0;
-        uint32_t start_pts = 0;
+        int64_t start_dts = 0;
+        int64_t dts_inc = 0;
     };
     map<CodecId,track_info> _codec_to_trackid;
     bool _started = false;