public Builder setContainerBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      container_ = value;
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
The container format. The default is `mp4`

Supported container formats:

- `ts`
- `fmp4`- the corresponding file extension is `.m4s`
- `mp4`
- `vtt`

See also:
[Supported input and output
formats](https://cloud.google.com/transcoder/docs/concepts/supported-input-and-output-formats)
</pre>

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

@param value The bytes for container 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/MuxStream.java