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ffmpeg lost audio adding png watermark to mp4

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http://www.linuxquestions.org – I have been trying to add a png file as watermark to mp4 file, but each attempt audio is not in new files? lost audio from origianl mp4 Best attempt for video quality so far ; Quote: ffmpeg -t 0:0:30.0 -i 'input.mp4' -i 'logo.png' -filter_complex '[0:v][1:v]overlay[out]' -map '[out]' -b:v 5842k -c:a copy out.mp4 (HowTos)