public Builder clearContainer() {
      container_ = getDefaultInstance().getContainer();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
The container format. The default is `fmp4`.

Supported container formats:

- `fmp4` - the corresponding file extension is `.m4s`
- `ts` - the corresponding file extension is `.ts`
</pre>

<code>string container = 3;</code>

@return This builder for chaining.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/MuxStream.java