public static com.google.cloud.video.transcoder.v1.TextStream.TextMapping parseFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
          PARSER, input, extensionRegistry);
    }
<pre>
Required. The zero-based index of the track in the input file.
</pre>

<code>int32 input_track = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The inputTrack.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/TextStream.java