Thank you for your quick reply. All the videos with issues were imported from a Sony Handycam dcr-sr68. Videos imported as mpg files do not have sound. All videos imported more recently are automatically saved as mpg files. Some videos previously imported from the same camera, (and some from other sources) but which were not saved as mpg files, do have sound. Some of these are mwv files, some are mov files and some are mp4. There may be other types. All the videos have sound when played by other programs. Thank you. Joan
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