HumanMedia wrote: > Another few questions: > > * In player settings, Transcoder settings, if I uncheck stdlin for FLAC > they no longer play at all. > >
STDIN is mandatory for QOBUZ and other plugins, not for local files playback, but you need one of STDIN/SEARCH to be enabled. HumanMedia wrote: > > > But setting it upsamples all FLAC of any datarate to 768. Is there > anyway of having FLAC upsample to the closest synchronous supported? No, at moment you could not select a different output sample rate based on different codecs. HumanMedia wrote: > > > * What is the default recommended Phase Response setting? Whats are the > pros and cons of each setting? >From the SOX manual: All resamplers use filters that can sometimes create echo (a.k.a. ringing) artefacts with transient signals such as those that occur with finger snaps or other highly percussive sounds. Such artefacts are much more noticeable to the human ear if they occur before the transient (pre-echo) than if they occur after it (post-echo). Note that frequency of any such artefacts is related to the smaller of the original and new sampling rates but that if this is at least 44.1kHz, then the artefacts will lie outside the range of human hearing. A phase response setting may be used to control the distribution of any transient echo between pre and post: with minimum phase, there is no pre-echo but the longest post-echo; with linear phase, pre and post echo are in equal amounts (in signal terms, but not audibility terms); the intermediate phase setting attempts to find the best compromise by selecting a small length (and level) of pre-echo and a medium lengthed post-echo. As a general rule: using starting and target saple rate well over 44.100 you could safetly use linear. Upsampling from 44100 you could use linear or intermediate, downsampling to 44100 or less OR upsampling form sampe rates lesser than 44100 you should use minimal. That said, if that really matter is debatable. Sure is much more important the Minimal band-width: Over 99% (990) artifact are liekely to be produced, 90.7% (907) is the bias point: no artifacts should be produced under this point, 95% (950) is the 'commonly' advised level. HumanMedia wrote: > > > * I take it that 'Automatic Headroom' give the -3db headroom, and that > Manual gain in db simply adds to that? Is that correct? (so Automatic > Headroom TRUE and Manual gain of 3db, gives a total of 6db headroom? from the SOX manual: Playing an audio file often involves resampling, and processing by analogue components can introduce a small DC offset and/or amplification, all of which can produce distortion if the audio signal level was initially too close to the clipping point. For these reasons, it is usual to make sure that an audio files signal level has some headroom, i.e. it does not exceed a particular level below the maximum possible level for the given representation. Some standards bodies recommend as much as 9dB headroom, but in most cases, 3dB (≈ 70% linear) is enough. Note that this wisdom seems to have been lost in modern music production; in fact, many CDs, MP3s, etc. are now mastered at levels above 0dBFS i.e. the audio is clipped as delivered. The −h option is used to apply gain to provide head-room for subsequent processing. So Automatic Headroom is not a fixed value, is internally calculated to provide 'just enough'. There is no simple way to know how much negatve gain is automaticalyy added but yes, Manual gain in db, is added on top of that. HumanMedia wrote: > > > * DSD-128 and higher no longer play, but DSD64 does. I have the DSDplay > plugin installed - is this interfering? It depends on the player. If Squeezelite compiled with DSD option DSDPlay shoul only pass thought, BUT via DOP (max DSD64). Some squeezelite versions (Squeezelite-R2 and even new versions form Ralphy) could play native DSD, but in order to take advantage of it you MUST disable DSDPlay. Hope is clear enough, please forgive my english, as usual. ________________________________________________________________________ Author of C-3PO plugin, Squeezelite-R2, Falcon Web interface - See www.marcoc1712.it ------------------------------------------------------------------------ marcoc1712's Profile: http://forums.slimdevices.com/member.php?userid=34842 View this thread: http://forums.slimdevices.com/showthread.php?t=105309
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