This is a complex issue, so please bear with me.
Driver is 1.0.20. Output of aplay -L, -l and .asoundrc is attached. The
MB is ASUS P5N7A-VM that features an Nvidia GeForce 9300 that provides
HDMI. Nvidia drivers are up-to-date. OS is Fedora 10 kernel
2.6.27.12-170
I'm using mplayer to play recorded (via HD HomeRun) OTA MPEG2 files.
When I play these files using mplayer defaults (-ao alsa) recordings
from some channels play wih perfect sound syncronization, while with
those from other channels the sound leads the video by 15 to 30
seconds. This is a consistent result, and is not related to signal
strength, as far as I can tell.
When I changed the mplayer parameter to -ao alsa::device=plughw=0.3, in
effect forcing the output to go through HDMI, the sync problem is
resolved, so it's apparent that the problem I experienced does not
relate to alsa.
So what's the beef? There's one additional glitch, which I'm assuming
has something to do with my alsa config. After about 30 minutes of HDMI
playback the sound begins to lead the video ever so slightly -- by a
second or so, but increasing. Telling mplayer to back up 5 seconds and
then move forward by the same ammount removes the audio lead, but it
reappears.
So, my question. How can I determine why the audio is getting out of
sync? And how can I cure it?
Thanks.
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC1200 Analog [ALC1200 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: ALC1200 Digital [ALC1200 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 3: NVIDIA HDMI [NVIDIA HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
front:CARD=NVidia,DEV=0
HDA NVidia, ALC1200 Analog
Front speakers
surround40:CARD=NVidia,DEV=0
HDA NVidia, ALC1200 Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=NVidia,DEV=0
HDA NVidia, ALC1200 Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=NVidia,DEV=0
HDA NVidia, ALC1200 Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=NVidia,DEV=0
HDA NVidia, ALC1200 Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=NVidia,DEV=0
HDA NVidia, ALC1200 Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=NVidia,DEV=0
HDA NVidia, ALC1200 Digital
IEC958 (S/PDIF) Digital Audio Output
hdmi:CARD=NVidia,DEV=0
HDA NVidia, NVIDIA HDMI
HDMI Audio Output
null
Discard all samples (playback) or generate zero samples (capture)
# ~/.asoundrc or /etc/asound.conf
# ALSA configuration file
##### IMPORTANT #####
# To make this ALSA configuration file work with your sound card, you will need
# to define the appropriate card and device information for the "analog-hw" and
# "digital-hw" devices below. You can find the card and device information
# using "aplay -l".
##### Configuration File #####
pcm.!default {
type plug
slave.pcm "dmix-digital"
}
# Alias for analog output on the card
pcm.analog-hw {
type hw
card 0
device 0
}
# Alias for digital (S/PDIF) output on the card
pcm.digital-hw {
type hw
card 0
device 3
}
pcm.!default {
type plug
slave {
pcm multi
rate 48000
}
ttable.0.0 1.0
ttable.1.1 1.0
ttable.0.2 1.0
ttable.1.3 1.0
}
pcm.stereo {
type plug
slave {
pcm multi
rate 48000
}
ttable.0.0 1.0
ttable.1.1 1.0
ttable.0.2 1.0
ttable.1.3 1.0
}
pcm.multi {
type multi
slaves.a.pcm "analog-hw"
slaves.a.channels 2
slaves.b.pcm "digital-hw"
slaves.b.channels 2
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}
------------------------------------------------------------------------------
Enter the BlackBerry Developer Challenge
This is your chance to win up to $100,000 in prizes! For a limited time,
vendors submitting new applications to BlackBerry App World(TM) will have
the opportunity to enter the BlackBerry Developer Challenge. See full prize
details at: http://p.sf.net/sfu/Challenge
_______________________________________________
Alsa-user mailing list
Alsa-user@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-user
