JohnB wrote: > Under "Convert/Output Format" you have three options for FLAC: > > flac (not compressed) > flac (medium compression) > flac (max compression) > > What FLAC compression levels do these equate to (e.g. 0, 5, 8)? >
I've found the answer to my own question: _flac_(not_compressed)_ There is no compression level specified in the resulting command: this means that sox will apply the default compression level. In the XIPH FLAC encoder the default compression level is 5 (it is likely, but not guaranteed, to be the same with sox). To implement this option properly the compression level should be set as -C 0, which is lower compression, not no compression. _flac_(medium_compression)_ = 5 _flac_(max_compression)_ = 8 A couple of points about this: Assuming that sox flac encoding operates the same way as the official XIPH FLAC encoder: Compression level 0 does not mean that there is no compression. The difference in the actual compression from level "0" to level "8" is not that great - only achieving an additional approx 5% reduction. BUT the amount of processing is very different indeed: compression level "5" takes around 2.5 x the time as level "0". Compression level "8" takes around 8 x the processing time as level "0". So I think it might be a good idea to limit the flac options to "low compression" (-C 0) and "medium compression" (-C 5). And, of course to implement C -0 for "low compression" Touch, Meridian G92, Bryston B4 SST2, PMC OB1i speakers, HP Proliant Microserver/Ubuntu, PC/Windows 7, iPad 4, iPeng, Squeezepad. ------------------------------------------------------------------------ JohnB's Profile: http://forums.slimdevices.com/member.php?userid=31553 View this thread: http://forums.slimdevices.com/showthread.php?t=105309 _______________________________________________ Squeezecenter mailing list Squeezecenter@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/squeezecenter
