[Flac] Room for safe opaque blocks in flac streams? Looking to add error correction to flac.

[Josh Coalson]

--- Gregory Maxwell <gmaxwell at gmail.com> wrote:

> Is there an obvious safe way to add some extra data to a flac file
> that spec decoders will happily ignore?
> 
> I'd like to explore creating a tool which will add N extra redundancy
> frames at the end which will allow perfect decoding with up to ~N
> frames lost in the files. This would allow users to sacrifice a tiny
> amount of compression for a substantial increase in file robustness.
> 
> This would also create a new potential audience for Flac: people who
> don't care about file size but care substantially about file
> robustness. A typical flac bloated back to the original wav size
> could
> lose roughly half its blocks and still remain perfectly decodable.
> 
> http://planete-bcast.inrialpes.fr/article.php3?id_article=7 has a
> nice
> high performance error correcting library which would work well for
> this sort of application.

you could put it in metadata, but error correction data really
belongs in the transport layer because the optimal method of
adding redundancy depends on the characteristics of the
communication channel.

e.g. for CDs a lot of people use quickpar/par2 + FLAC

Josh



 
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