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Martijn,<br>
<br>
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<div>Currently FLAC already stores and restores most kinds of
metadata corruption without problems, so in most cases the
conversion is already bit-accurate. However, there are some
kinds of corruption it cannot handle. These are the kinds of
corruption that invalidate your considerations. For example,
when a chunk length is incorrect, the location and length of
the audio data is no longer known. It is also possible the
basic formatting information is invalid. In this case, FLAC
cannot compress the audio at all, not even without
considering foreign metadata, while general purpose
compressors (who don't have to discriminate between audio
and metadata) have no problem compressing.<br>
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OK.<br>
<br>
That's why I said<br>
<br>
"<font face="Courier New">as long as the audio data is consistent,
with known format and correctly located."<br>
<br>
However, I think there are relatively few uncompressed formats,
and probably all of them share having large audio blocks. It would
be feasible to think of an algorithm that attempts to find audio
alignment by iteratively testing a short portion for different
alignments (meaning different number of channels and bit depths,
little/big endianness, and a few other variants or combinations of
PCM) until the maximum compression is attained. Once located the
optimum alignment, the FLAC algorithm would provide bit-for-bit
accuracy and maximum compression, even in the absence of
format-awareness. It would take a bit more time to encode and
could generate its internal header for direct playback
compatibility.<br>
<br>
Regards,<br>
<br>
Federico Miyara<br>
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