public Builder clearFilenamePrefix() {
            filenamePrefix_ = getDefaultInstance().getFilenamePrefix();
            bitField0_ &= ~0x00000008;
            onChanged();
            return this;
        }
<pre>
(optional)
</pre>

<code>string filename_prefix = 4;</code>

@return This builder for chaining.
turms-plugins/turms-plugin-livekit/src/main/java/im/turms/plugin/livekit/core/proto/egress/ImageOutput.java