public Builder setRateControlModeBytes(com.google.protobuf.ByteString value) {
        if (value == null) {
          throw new NullPointerException();
        }
        checkByteStringIsUtf8(value);
        rateControlMode_ = value;
        bitField0_ |= 0x00000020;
        onChanged();
        return this;
      }
<pre>
Specify the `rate_control_mode`. The default is `vbr`.

Supported rate control modes:

- `vbr` - variable bitrate
- `crf` - constant rate factor
</pre>

<code>string rate_control_mode = 6;</code>

@param value The bytes for rateControlMode to set.
@return This builder for chaining.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/VideoStream.java