On Mon, 2004-08-09 at 11:41, Jack O'Quin wrote: > David Baron <d_baron@xxxxxxxxxx> writes: > > > On Monday 09 August 2004 11:33, linux-audio-user-request@xxxxxxxxxxxxxxxxxx > > wrote: > > > The second stable release (0.9.0) of JAMin - the JACK Audio Mastering > > > interface is now available for download. > > > > Problem with Jamin is that is a process to process thingie. Another program, > > eating precious CPU cycles, must be playing and pre-processing the audio to > > feed Jamin. I just do not have the CPU guts to run this way. Under that other > > OS, I can run this type of software as a standalone (file-to-file) or DX/VST > > plugin OK. The three-process (playing app, jack, Jamin, jack) system is just > > not efficient. > > While the JACK overhead is measurable, I doubt it's your main problem. > > JAMin uses an FFT for linear-phase filtering. This is quite expensive > in CPU, but sounds great. We made that tradeoff consciously, choosing > sound quality over CPU cost, recognizing that some older CPUs would > have trouble keeping up. Moore's Law is rapidly fixing that problem > even as we speak. JAMin only uses about 25% of my relatively old > Athlon XP 1800+. > > IIUC, most Windows mastering applications use lower-cost non-linear > filters, so they run comfortably on low-end hardware. That is a > reasonable business tradeoff for them to make. > > If your machine is close to being able to hack it, try using a large > JACK buffer size (-p2048 or -p4096). This reduces both JACK and FFT > overhead. Mastering does not require low-latency operation, anyway. > > > A standalone or LDASCP Jamin would be worthwhile for those of us with older > > equipment. > > You're welcome to contribute one yourself. The GUI is far too complex > for LADSPA, but there's nothing particularly complicated about adding > file I/O to JAMin, itself. We just didn't feel like working on that. > There are so many good JACK-based solutions already available. Every time I think about doing that I get lazy ;-) Also, on my Athlon XP 1700+ I can run 12-16 tracks in Ardour (with bunches of active plugins) to the master bus, master bus to JAMin, JAMin to a stereo track in Ardour and only use about 40% CPU. The incentive just isn't there for me. But, if someone wants to do the hard part (I/O) I'll be glad to add it to the GUI :-) Jan
