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-rw-r--r--main/rtp.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/main/rtp.c b/main/rtp.c
index 1bdb1b92c..f481f1e91 100644
--- a/main/rtp.c
+++ b/main/rtp.c
@@ -1598,6 +1598,11 @@ struct ast_frame *ast_rtp_read(struct ast_rtp *rtp)
rtp->lastividtimestamp = timestamp;
rtp->f.delivery.tv_sec = 0;
rtp->f.delivery.tv_usec = 0;
+ /* Pass the RTP marker bit as bit 0 in the subclass field.
+ * This is ok because subclass is actually a bitmask, and
+ * the low bits represent audio formats, that are not
+ * involved here since we deal with video.
+ */
if (mark)
rtp->f.subclass |= 0x1;
} else {