View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0007676 | ardour | features | public | 2018-10-14 20:56 | 2018-10-15 16:44 |
| Reporter | unfa | Assigned To | x42 | ||
| Priority | normal | Severity | minor | Reproducibility | have not tried |
| Status | closed | Resolution | no change required | ||
| Product Version | 5.12 | ||||
| Summary | 0007676: Ardour uses TAR.XZ format - which was proven to be inadequate for long-term archiving | ||||
| Description | I've found out that the XZ format is not very robust. Here's a scientific analysis of all the problems with it: http://www.nongnu.org/lzip/xz_inadequate.html I've personally started using Lzip instead, as it provides even a slightly better compression ratio in most cases (as it's not using any padding) and is much more robust for data recovery - there's a program called lziprecover. On the contrary - XZ has no recovery tools and it will not read an archive if a single byte of padding is damaged (!) - not to mention the actual data or metadata. A single bit flip can easily render an XZ archive unreadable, while Lzip was made with great attention to prevent that from being the case. I think it'd be nice if Ardour allowed using some other options apart from TAR.XZ. I'd personally use TAR.LZ, but TAR.GZ or TAR.BZ2 could also work great. | ||||
| Additional Information | In Linux Mint there are packages called `lzip` and `plzip` (parallel lzip) - the latter makes the lzip command use the parralel version, which is great, as most people nowadays have at least 2 or 4 threads in their CPU. | ||||
| Tags | No tags attached. | ||||
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Ardour does use lzma to compress session-archives. In any case the point about single bit-flip is somewhat moot. wav, plain-text/XML, flac don't have any redundancy either. Also the case where archives are corrupted in a way that allow redundant recovery is somewhat constructed and rare. |
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Incorrect assumption. Ardour does not use xz, but lzma (same as lzip) for optional compression of archives |
