gst-launch-0.10 no syncronized audio with alsa and hdmi - gstreamer

Question

I'm working on a imx 6DualLite.
I can't add or edit system libraries.
I have to play an audio file from hdmi and speakers.
This is the pipeline I am using:
gst-launch-0.10 filesrc location=/home/root/beep.wav ! wavparse ! audioconvert ! audioresample ! tee name=t ! queue ! alsasink t. ! queue ! volume volume=1 ! alsasink device=sysdefault:CARD=imxhdmisoc
The problem is that the audio of the speakers is not synchronized with the audio of the hdmi
I've already tried to add
... alsasink device=sysdefault:CARD=imxhdmisoc sync=TRUE

Answer 1

As Florian mentioned, I'm not sure you'll realistically be able to expect the outputs to be synchronized automatically.
But if you don't mind some user intervention and/or hard-coding, you could experiment with the render-delay property of each alsasink. Set the value in nanoseconds. (e.g. one second is 1000000000 nanos).
Here's a sample with video:
gst-launch-1.0 videotestsrc pattern=ball ! videoconvert ! tee name=t ! queue ! ximagesink t. ! queue ! ximagesink render-delay=1000000000

Answer 2

I found a solution (in my case it worked) by linking the two cards that are displayed with the command:
~ $ cat / proc / asound / cards
0 [DWHDMI]: dw-hdmi-ahb-aud - DW-HDMI
DW-HDMI rev 0x0a, irq 22
1 [sgtl5000audio]: sgtl5000-audio - sgtl5000-audio
sgtl5000-audio
2 [tda1997xaudio]: tda1997x-audio - tda1997x-audio
tda1997x-audio
By following this guide:
https://www.alsa-project.org/wiki/Asoundrc#Virtual_multi_channel_devices
I edited the file /etc/asound.conf. I do not quote the whole file (it is very long) but only the last part that I modified:
...
pcm.!default{
type plug
route_policy "average"
slave.pcm "asymed"
}
ctl.!default{
type hw
card 0
}
ctl.mixer0{
type hw
card 0
}
became
...
pcm.!default{
type plug
route_policy "average"
slave.pcm "asymed"
}
ctl.mixer0{
type hw
card 0
}
pcm.primary{
type hw
card 0
device 0
}
ctl.primary {
type hw
card 0
}
pcm.secondary{
type hw
card 1
device 0
}
ctl.secondary {
type hw
card 1
}
pcm.multi {
type multi
slaves.a.pcm "primary"
slaves.a.channels 2
slaves.b.pcm "secondary"
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
}