Fons Adriaensen <fons@xxxxxxxxxxxxxx> a écrit : > I mean: there is no need to resample if you want to use mplayer with > Jack. If the audio file's sample rate doesn't match that of Jack, > mplayer will do the resampling. Mmhh... I'd prefer everything in 24bit until the output to alsa; I don't want to provide 16bit channels to ambdec from 24bit amb files. But then, is it a valid concern? I have the feeling that it doesn't matter much... > Start Jack with two playback channels, and any program having at least > four jack inputs, e.g. ambdec. Then try > > mplayer -ao jack:port=ambdec -channels 4 YOUR_4_CH_FILE > > and mplayer will have four output ports and connect them to ambdec's > inputs, even if your sound card has only two outputs. It works as you described. > The real problem is that mplayer doesn't allow you to specify the > connections, they could be in any order. So chances are 1 in 24 that > they will be correct in this case. Mplayer is one of the many apps > that claim Jack support but get it all wrong. For FOA, mapping of amb files is WXYZ, while ambdec inputs are 0w,1y,1z,1x (why?), so the connections are wrong (W-0w,X-1y,Y-1z,Z-1x). Here's how I remapped the outputs: mplayer -loop 0 -channels 4 -af channels=4:4:0:0:1:3:2:1:3:2 -ao jack:port=ambdec AJH_eight-positions.amb I will write a script to support other amb channels mapping with mplayer (up to fff in Malham notation). Now my problem is to connect mplayer to a second instance of ambdec; I need it for lower frequencies, and since I use a triangle (for basic horizontal decoding), I had to change the lower limit for the number of allowed channels in the source code of ambdec. > > - I installed the latest Jackd (version 1.9.10 from Grame): > > zita-j2a now works! :) > > What was your previous Jack version ? Version 0.121. It was kept on my system by some old software. I uninstalled all software with dependencies to Jack, then I was able to install a newer version of Jack. > > after the "Starting synchronisation" message, there's now a > > continuous sequence of numbers. > > Probably because you still use -v. See the README for what they mean. Yes, it's useful to verify if it works. > > Suggestion: a note in the documentation about the version of > > Jackd would help. > > It shouldn't matter, unless it's *very* old. Zita-ajbridge requires > nothing special from Jack, apart from a working DLL. And that was > added at least five years ago. Ubuntu is still providing version 0.121, even in the newest development distribution (saucy), probably for compatibility issues. -- Marc _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
