write failed, drop flushed note off on the floor, time 4 > 0

Installation & Configuration Linux
#1

Hi All,

I’m brand new to Ardour and am trying to get some basic stuff playing through midi. The problem is that note-off messages are regularly being dropped and Ardour prints a message like this to the console:

write failed, drop flushed note off on the floor, time 332 > 0

Does anybody know what causes this or what I could do to mitigate it?

thanks,
Matt

#2

it is a bug. it will be worked on. there is nothing you can to mitigate it. i am not sure of the full consequences of it at this time. i may try to get a fix into 3.5.1 (which needs to come out to fix a couple of other specific issues).

#3

Thanks Paul! I’ll keep an eye out for the next release. Good to know it is not a hardware issue.

So, I guess this means that downgrading to 3.4 would not help the issue.

#4

I’ve just fixed this issue. The fix is in our git repository, and will be in 3.5.1 out soon.

#5

Thanks! I’ll pull the git and give it a try.

#6

Playback runs for a few seconds (with no dropped notes as far as I can tell) but then we hit an assertion:

WARNING: Stuck note resolution - end time @ 9.62719 is before note on: Note #11992: pitch = 57 @ 9.62719 .. 9.62719 velocity 127 chn 0

(ardour-3.5:7848): Gtk-CRITICAL **: IA__gtk_text_buffer_set_text: assertion `text != NULL' failed
ardour-3.5: ../libs/ardour/audio_diskstream.cc:621: virtual int ARDOUR::AudioDiskstream::process(ARDOUR::BufferSet&, ARDOUR::framepos_t, ARDOUR::pframes_t, ARDOUR::framecnt_t&, bool): Assertion `wrap_buffer_size >= necessary_samples' failed.
Aborted (core dumped)
#7

After restart, assertion failure does not happen…yay. Everything is working :slight_smile:

#8

That crash is unrelated and ought to have been filed as a bug report with a backtrace from teh core dump. oh well, missed opportunities …