private com.google.protobuf.SingleFieldBuilderV3<
              com.google.protobuf.Timestamp,
              com.google.protobuf.Timestamp.Builder,
              com.google.protobuf.TimestampOrBuilder>
          getMarkinTimeFieldBuilder() {
        if (markinTimeBuilder_ == null) {
          markinTimeBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.protobuf.Timestamp,
                  com.google.protobuf.Timestamp.Builder,
                  com.google.protobuf.TimestampOrBuilder>(
                  getMarkinTime(), getParentForChildren(), isClean());
          markinTime_ = null;
        }
        return markinTimeBuilder_;
      }
<pre>
The mark-in Unix epoch time in the original live stream manifest.
</pre>

<code>.google.protobuf.Timestamp markin_time = 1;</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/Clip.java