Public bug reported:
I am encoding all audio in AC3 and sending it to my Logitech Z-5500
speakers through the SPDIF out jack on my laptop. Audio works fine for a
while until it breaks up randomly and pulseaudio eventually crashes. By
looking to the pulseaudio logs one can see some buffer underruns. I also
tested with the 3.9.4 mainline kernel though I am not sure this issue is
driver related. The result is always the same! I have this in
/usr/share/alsa/alsa.conf.d/a52.conf
pcm.a52 {
@args [CARD]
@args.CARD {
type string
}
type rate
slave {
pcm {
type a52
format S16_LE # S16_LE, S16_BE
channels 6 # 2, 4, 6
bitrate 640 # 192, 224, 256, 320, 384, 448, 512, 576,
640
card $CARD
}
rate 48000 # 44100, 48000
}
}
One other thing I tried was the dcaenc-2 alsa plugin from this web page
http://aepatrakov.narod.ru/index/0-2 and this plugin appears to not have
the same problem. The disadvantage of the dca plugin is that it needs a
lot more processing power! So I would prefer the a52 plugin if it worked
flawlessly.
These are the answers to the first two questions:
1)
Ubuntu 13.04
2)
libasound2-plugins-extra:
Installed: 1.0.25-2ubuntu3
Candidate: 1.0.25-2ubuntu3
Version table:
*** 1.0.25-2ubuntu3 0
500 http://pt.archive.ubuntu.com/ubuntu/ raring/universe amd64 Packages
100 /var/lib/dpkg/status
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "pulseaudio log with a52 alsa plugin on ubuntu 13.04
kernel"
https://bugs.launchpad.net/bugs/1188425/+attachment/3696818/+files/pulse_20130526.7z
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https://bugs.launchpad.net/bugs/1188425
Title:
Audio breaks up and pulseaudio eventually crashes with Alsa a52 (ac3)
plugin (Ubuntu 13.04)
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