Annoying audio delay with AirPlay

I'm very displeased to report that there's a tiny (and yet extremely annoying) delay in the audio played from a Sony Home Theather HT-CT150 connected via HDMI to an Apple TV with AirPlay compared to the sound from my iMac. I've tried changing all the settings possible on the HT-CT150 to no avail and so, ridiculously, I had to connect the HT-CT150 to my AirPort Express from which standard RCA cables come out for a perfectly in-sync sound experience. Conclusion, it is the HT-CT150 processing time that creates the delay and there isn't anything I can do about it and so my only option is to find a way to make my iMac to delay its sound somehow so I can adjust it to what I need.
Obviously I don't want to have both the Apple TV and the AirPort Express connected to the HT-CT150 when one device should be able to handle the task. Is there any app (in our outside the Mac App store) that can help me accomplish that?
Thanks in advance for all the help you can provide!
Jorge...

I have the same problem. The first second or so is missing. It happens because my receiver has to "tune" in to the PCM signal. In the mean while my ATV is allready transmitting/playing the song and my receiver is still triyng to figure out what kind off signal is coming in, causing it to skip the first second of each song. Possible solutions are to let ATV wait with playing the song, wich involves some sort off handshaking between my receiver, my ATV end itunes. An other solution could be to put one second of "silence" in front of every song, so my receiver has time to sync to the PCM signal. Both of wich i don't know how to implement. I find it strange that my receiver has to sync to the PCM signal at the start of every song. Why does ATV not keep the PCM signal intact instead of dropping it between songs? My receiver is a Philips model. The problem does not occer when playing music via the iPad. Very annoing problem.

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pcm.!default {
type hw
card 3
ctl.!default {
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card 3
-- mod edit: read the Forum Etiquette and only post thumbnails http://wiki.archlinux.org/index.php/For … s_and_Code [jwr] --
Last edited by voodur (2014-04-23 22:24:35)

emeres wrote:Does this behaviour continue with pulseaudio killed? Use alsa directly to narrow the problem down first.
Yes. It did exist even before I installed pulseaudio.
emeres wrote:Check different resolutions, sample rates and channels. Try to determine the lowest buffer and period size, that the DAC accepts.
If by this you mean this, I went through that guide and it did not make any difference.
I found out that sometimes some audio formats, such as wav or mp3 do not produce this flaw. I gathered stats about this here. VLC was used for playback and displaying the information. Amarok behaves similarly.
emeres wrote: You probably load snd-usb-audio module with no options. Try loading it with "nrpacks" using different settings (default is 8, try 1, 2).
I am not sure if this is the way to do it, but I followed this guide and added file: "usbsound.conf" to "/etc/modprobe.d/". usbsound.conf has line: "options snd_usb_audio nrpacks=2". I tried changing the nrpacks to various values and booted after every change, but it did not make difference to the audio skipping.
What could it be that .xm (and every other tracker music format) and .ogg files are not playing like mp3 or wav?
Sorry for delayed reply and about that image
Last edited by voodur (2014-05-06 12:37:57)

Annoying audio delay with AirPlay

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