@java.lang.Override
    public int getSerializedSize() {
      int size = memoizedSize;
      if (size != -1) return size;

      size = 0;
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(atomKey_)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, atomKey_);
      }
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(inputKey_)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, inputKey_);
      }
      if (inputTrack_ != 0) {
        size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, inputTrack_);
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSize = size;
      return size;
    }
<pre>
Required. The zero-based index of the track in the input file.
</pre>

<code>int32 input_track = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The inputTrack.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/TextStream.java