public Builder mergeTextStream(com.google.cloud.video.transcoder.v1.TextStream value) {
      if (textStreamBuilder_ == null) {
        if (elementaryStreamCase_ == 3
            && elementaryStream_
                != com.google.cloud.video.transcoder.v1.TextStream.getDefaultInstance()) {
          elementaryStream_ =
              com.google.cloud.video.transcoder.v1.TextStream.newBuilder(
                      (com.google.cloud.video.transcoder.v1.TextStream) elementaryStream_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          elementaryStream_ = value;
        }
        onChanged();
      } else {
        if (elementaryStreamCase_ == 3) {
          textStreamBuilder_.mergeFrom(value);
        } else {
          textStreamBuilder_.setMessage(value);
        }
      }
      elementaryStreamCase_ = 3;
      return this;
    }
<pre>
Encoding of a text stream. For example, closed captions or subtitles.
</pre>

<code>.google.cloud.video.transcoder.v1.TextStream text_stream = 3;</code>
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/ElementaryStream.java