In order to consistently get sound all areas of Boxee (e.g. web video, local DTS/AC3 passthru and PCM), my asoundrc looks like this:
pcm:iec958 hdmi:NVidia
pcm.dmixer {
type dmix
ipc_key 1024
ipc_key_add_uid false
ipc_perm 0660
slave {
pcm "hw:0,7"
rate 48000
channels 2
period_time 0
period_size 1024
buffer_time 0
buffer_size 8192
}
}
pcm.!default {
type plug
slave.pcm "dmixer"
}
This works well for everything except content at 44.1kHz, which obviously gets resampled to 48kHz by the dmixer device defined above, and it applies to whenever I use the defined dmixer device, regardless of the software that's playing it.
The symptoms I'm experiencing are one or two momentary stutters every 5 minutes (typically a two of stutters in the first minute, then nothing for a while). Is there anything obvious I can do with the configuration above to remedy it?
If I use specific hw devices for 44.1kHz playback, I don't get the stutters BUT that's not an option for Boxee, as the audio is very flaky (device locking issues, and web video always uses the default ALSA device regardless of what's set in Boxee's preferences).
I'm using:
- Mythbuntu 10.10 Maverick (x86_64)
- Alsa 1.0.23
...with the following modules:
$ lsmod | grep snd
snd_hda_codec_nvhdmi 14587 4
snd_hda_intel 26019 4
snd_hda_codec 100919 2 snd_hda_codec_nvhdmi,snd_hda_intel
snd_hwdep 6660 1 snd_hda_codec
snd_pcm 89104 5 cx88_alsa,snd_hda_intel,snd_hda_codec
snd_seq_midi 5932 0
snd_rawmidi 22207 1 snd_seq_midi
snd_seq_midi_event 7291 1 snd_seq_midi
snd_seq 57512 2 snd_seq_midi,snd_seq_midi_event
snd_timer 23850 4 snd_pcm,snd_seq
snd_seq_device 6912 3 snd_seq_midi,snd_rawmidi,snd_seq
snd 64117 13 cx88_alsa,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore 1240 1 snd
snd_page_alloc 8588 2 snd_hda_intel,snd_pcm
The audio device is from an Nvidia GT210 video card, running 260.19.06:
hdmi:CARD=NVidia,DEV=0
HDA NVidia, NVIDIA HDMI
HDMI Audio Output
hdmi:CARD=NVidia,DEV=1
HDA NVidia, NVIDIA HDMI
HDMI Audio Output
hdmi:CARD=NVidia,DEV=2
HDA NVidia, NVIDIA HDMI
HDMI Audio Output
hdmi:CARD=NVidia,DEV=3
HDA NVidia, NVIDIA HDMI
HDMI Audio Output
dmix:CARD=NVidia,DEV=3
HDA NVidia, NVIDIA HDMI
Direct sample mixing device
dmix:CARD=NVidia,DEV=7
HDA NVidia, NVIDIA HDMI
Direct sample mixing device
dmix:CARD=NVidia,DEV=8
HDA NVidia, NVIDIA HDMI
Direct sample mixing device
dmix:CARD=NVidia,DEV=9
HDA NVidia, NVIDIA HDMI
Direct sample mixing device
dsnoop:CARD=NVidia,DEV=3
HDA NVidia, NVIDIA HDMI
Direct sample snooping device
dsnoop:CARD=NVidia,DEV=7
HDA NVidia, NVIDIA HDMI
Direct sample snooping device
dsnoop:CARD=NVidia,DEV=8
HDA NVidia, NVIDIA HDMI
Direct sample snooping device
dsnoop:CARD=NVidia,DEV=9
HDA NVidia, NVIDIA HDMI
Direct sample snooping device
hw:CARD=NVidia,DEV=3
HDA NVidia, NVIDIA HDMI
Direct hardware device without any conversions
hw:CARD=NVidia,DEV=7
HDA NVidia, NVIDIA HDMI
Direct hardware device without any conversions
hw:CARD=NVidia,DEV=8
HDA NVidia, NVIDIA HDMI
Direct hardware device without any conversions
hw:CARD=NVidia,DEV=9
HDA NVidia, NVIDIA HDMI
Direct hardware device without any conversions
plughw:CARD=NVidia,DEV=3
HDA NVidia, NVIDIA HDMI
Hardware device with all software conversions
plughw:CARD=NVidia,DEV=7
HDA NVidia, NVIDIA HDMI
Hardware device with all software conversions
plughw:CARD=NVidia,DEV=8
HDA NVidia, NVIDIA HDMI
Hardware device with all software conversions
plughw:CARD=NVidia,DEV=9
HDA NVidia, NVIDIA HDMI
Hardware device with all software conversions
Reasonably new to tinkering with sound on Ubuntu, so forgive me if this information isn't relevant or incomplete.
Thanks in advance,
Ben
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