public Builder setSource(
        com.google.cloud.video.livestream.v1.TimecodeConfig.TimecodeSource value) {
      if (value == null) {
        throw new NullPointerException();
      }
      bitField0_ |= 0x00000001;
      source_ = value.getNumber();
      onChanged();
      return this;
    }
<pre>
The source of the timecode that will later be used in outputs/manifests.
It determines the initial timecode/timestamp (first frame) of output
streams.
</pre>

<code>.google.cloud.video.livestream.v1.TimecodeConfig.TimecodeSource source = 1;</code>

@param value The source to set.
@return This builder for chaining.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/TimecodeConfig.java