public Builder clearOutputChannel() {
        bitField0_ = (bitField0_ & ~0x00000010);
        outputChannel_ = 0;
        onChanged();
        return this;
      }
<pre>
Required. The zero-based index of the channel in the output audio stream.
</pre>

<code>int32 output_channel = 5 [(.google.api.field_behavior) = REQUIRED];</code>

@return This builder for chaining.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/AudioStream.java