Hey, this is not really a bug, it's a missing feature. -y is implemented by craeting silence, not just by chaning the timecodes. Therefore mkvmerge has to know how to create silence for that particular audio type. For FLAC it doesn't.
You could use the --delay feature which really only modifies the timestamps. However, the player in question must be able to deal with tracks which don't have any data at the beginning (which is usually not a big problem if you're just adjusting up to 1s). Mosu -- If Darl McBride was in charge, he'd probably make marriage unconstitutional too, since clearly it de-emphasizes the commercial nature of normal human interaction, and probably is a major impediment to the commercial growth of prostitution. - Linus Torvalds
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