Hi there! I wanted to replace a "complicated" setup using named pipes and metadata passthrough with the "new" pipe() operator, but it craps out if I put it next to a switch().
I'm using the well-known StereoTools from https://www.stereotool.com/download/stereo_tool_cmd (version 9.01) with liq 1.3.3 (compiled using opam) on Ubuntu 18.04. Current code does output.external() to a named pipe (mkfifo), I then use input.external() using cat to stream it back to liq, then to icecast. That works nicely and has for quite some time now, but it's a bit bulky especially when you have to handle metadata. So I did: pl1 = playlist("music1") pl2 = playlist("music2") radio = switch([ ({ 0h-12h }, pl1), ({ 12h-0h }, pl2) ]) cross = smart_crossfade(radio) binary = "/usr/local/bin/stereo_tool_cmd_64" preset = "GENERIC PRESETS/Jeff - Groove! (soft)" cmd = binary ^ " -p '" ^ preset ^ "' -q - - 2>/dev/null" # stereo_tool_cmd_64 takes an input and an output file # treats - as stdin / stdout # -q means quiet # cmd should look like: # stereo_tool_cmd_64 -p 'preset' -q - - 2>/dev/null flux_traite = mksafe(pipe(id="st", process=cmd, cross)) output.icecast(…, flux_traite) And after the first song is played, the next ones starts, then it seems that stereotools crashes, so liq switches to blank, then back on the pipe. So I thought, let's add some buffer on the pipe! But well, I tried up to 15s and it didn't help. I removed everything and debuggged my way until I found it works as expected as long as I don't use switch()... Then I thought... Maybe it's using the same clock and getting lost trying to sync (not sure how it does it then but well) ? So I gave pipe its own clock: flux_traite = mksafe(clock(pipe(id="st", process=cmd, cross))) That fails too. So I thought maybe stereotool thinks the file ends for some reason.. And added a buffer on the source (the smart_crossfade here) cross = buffer(smart_crossfade(radio), buffer=3.0) flux_traite = mksafe(pipe(id="st", process=cmd, cross)) And... it looks like it works but the buffer() probably doesn't like the situation: 2018/07/18 03:12:29 [warp_prod_8852:3] Buffer emptied, start buffering... 2018/07/18 03:12:33 [warp_prod_8852:3] Buffer emptied, start buffering... And liq uses an awful lot of CPU then, even crashing... Segmentation fault (core dumped) If I put the switch() off, it works as expected (the oiginal script has playlist, rotate, ....) Help ? ;) Cheers, Gilou ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Savonet-users mailing list Savonet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/savonet-users
