Hi Carl, Due to the lack of my english ability, I did not fully understand what you meant by "the muxer". If you meant testing the "spdif" muxer in ffmpeg, I will be willing to do it, [ここから私のようにどうテストしていいかわからない場合: but I'm not familiar with ffmpeg and not sure how I can test it. Would you show me how to do that? ] regards, XXXX