On Blu-rays PCM audio with an odd number of channels will still contain
empty bytes for an extra alignment channel (e.g. with 3 channels at 24
bits/sample the source actually contains 3+1channels * 24bits/channel /
8bits/byte = 4 * 3bytes = 12 bytes.
That extra "channel" is located after all the others and only contains 0
bytes.
mkvmerge will now simply remove these extra bytes. Otherwise players see
and use more data than the timestamps and track parameters imply causing
both noise artifacts as well as slowed playback.
