| AC3 is not designed to be a container format. If it were designed to be a container format, it would NOT be tied to a specific encoder. Container formats are deliberately not tied to any format. AC3 is tied to AC3's encoding, ergo it's not a container format.
Encoding anything to AC3 will result in a loss of quality on all systems, in exactly the same way that encoding MP3 will result in a loss of quality on all systems. Such is the problem with lossy compression.
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