User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.2.8) Gecko/20100723 Ubuntu/10.04 (lucid) Firefox/3.6.8 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.2.8) Gecko/20100723 Ubuntu/10.04 (lucid) Firefox/3.6.8 When listening on for the "ended" event on an audio object, it is triggered 2/3 seconds after the audio has finished, Affects ubuntu (lucid) Reproducible: Always Steps to Reproduce: 1. visit http://pastebin.me/a0146e64ed386da270e51eb7a0893615 2. play song and wait for ended event alert 3. Actual Results: Ended event is 2 seconds later

I can't reproduce this with your testcase (there's a delay between the end of sound and the alert appearing, but it seems like 500ms at most), but I do see it with http://flim.org/~kinetik/tests/bug581321/test.html. Each of the files play back to back on OS X, but there's a two second or so delay between each file on Linux.

I happened to catch this in the debugger. It turns out that we're waiting in sa_stream_drain for an unusually long time. While playing back a 1 second audio file, I recorded sa_stream_drain taking 2.5s. Adding debug logging to the alsa-pulse plugin, the pulse_wait_operation on the operation returned by pa_stream_drain is what's taking all the time, so we're stuck waiting on the PA server to respond here.

Simple reproducer using the PulseAudio client API. So, now I'm really confused: Write a second of audio, then immediately call drain and wait for completion: % time ./a.out 1 write 48000 samples drain ./a.out 1 0.00s user 0.01s system 0% cpu 2.539 total Write a second of audio, sleep for 500ms, then call drain and wait: % time ./a.out 1 sleep write 48000 samples sleep drain ./a.out 1 sleep 0.00s user 0.01s system 1% cpu 0.516 total % time ./a.out 10 write 480000 samples drain ./a.out 10 0.01s user 0.01s system 0% cpu 7.118 total % time ./a.out 10 sleep write 48000 samples sleep drain ./a.out 10 sleep 0.00s user 0.01s system 1% cpu 0.511 total

Emailed pulseaudio-discuss about this: https://tango.0pointer.de/pipermail/pulseaudio-discuss/2010-November/008189.html

Oh, the sleep cases in comment 3 are bogus, my testcase had a bug in the argument parsing, so that part is a red herring.

Existing PA bug: http://pulseaudio.org/ticket/866

Fixed by bug 623444.