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Subject:Why does a save on a PCA rebuild the proxy
Posted by: RikTheRik
Date:5/28/2002 1:18:57 PM

I am wondering why a file save on a PCA file does rebuild the proxy !
This shouldn't have sense since they are non destructive ?

Subject:RE: Why does a save on a PCA rebuild the proxy
Reply by: Sonic
Date:5/28/2002 2:52:52 PM

All proxied formats will rebuild proxies after a save *due* to the non-destructive nature of Sound Forge 6.0. If you made any changes and then saved, the original proxy is no longer valid. That is, we save to .pca from the proxy _and_ the edit history _and_ any temporary files that have been created due to various edit operations. In order to retain the original proxy, we'd have to "commit" changes into the proxy and then save the .pca from it. That would typically be less desirable than just rebuilding the proxy upon re-open.

A destructive editor like Sound Forge 5.0, will modify the proxy directly on every edit, so it need not be rebuilt when saving to uncompressed or lossless formats.

PCA is lossless, but we still treat it as a compressed (and proxied) format in order to optimize performance (so we don't have to decompress it on-the-fly every time we read from the file). We may investigate an option for skipping proxies altogether in future versions of Sound Forge...but it is likely that on-demand decompression will be too taxing in an editing application to make proxies obsolete, at least for the time being.


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