block tags before first cluster, post tags after

Author: jdelapla

src/client/src/Stream.c

@@ -731,7 +731,7 @@ STATUS putFrame(PKinesisVideoStream pKinesisVideoStream, PFrame pFrame)
     UINT64 remainingSize = 0, remainingDuration = 0, thresholdPercent = 0, duration = 0, viewByteSize = 0, allocSize = 0;
     PBYTE pAlloc = NULL;
     UINT32 trackIndex, packagedSize = 0, packagedMetadataSize = 0, overallSize = 0, itemFlags = ITEM_FLAG_NONE;
-    BOOL streamLocked = FALSE, clientLocked = FALSE, freeOnError = TRUE;
+    BOOL streamLocked = FALSE, clientLocked = FALSE, freeOnError = TRUE, justStartedStreaming = FALSE;
     EncodedFrameInfo encodedFrameInfo;
     MKV_STREAM_STATE generatorState = MKV_STATE_START_BLOCK;
     UINT64 currentTime = INVALID_TIMESTAMP_VALUE;
@@ -900,7 +900,7 @@ STATUS putFrame(PKinesisVideoStream pKinesisVideoStream, PFrame pFrame)
         CHK_STATUS(mkvgenPackageFrame(pKinesisVideoStream->pMkvGenerator, pFrame, pTrackInfo, pAlloc, &packagedSize, &encodedFrameInfo));
 
         // Package the metadata if specified
-        if (packagedMetadataSize != 0) {
+        if (packagedMetadataSize != 0 && !justStartedStreaming) {
             // Move the packaged bits out first to make room for the metadata
             // NOTE: need to use MEMMOVE due to the overlapping ranges
             MEMMOVE(pAlloc + encodedFrameInfo.dataOffset + packagedMetadataSize, pAlloc + encodedFrameInfo.dataOffset,