On 29.01.2018 18:46, Nico wrote: > On 01/29/2018 03:52 PM, NicoHood wrote: >> On 01/29/2018 03:29 PM, Georg Chini wrote: >>> On 29.01.2018 14:44, NicoHood wrote: >>>> On 01/29/2018 01:39 PM, Georg Chini wrote: >>>>> On 29.01.2018 12:52, Nico wrote: >>>>>> Hi, >>>>>> I want to capture the audio stream of my TV with my PCI-E Toslink sound >>>>>> card and play it back on my usb XLR soundcard. The reason why I do that >>>>>> is to use my own music boxes rather than the TV speakers. With >>>>>> toslink + >>>>>> XLR I do not have problems with ground loops etc. >>>>>> >>>>>> I am using the pulseaudio loopback module with its default >>>>>> configuration. The problem is, that the delay between picture and sound >>>>>> is about one second off, and the longer I wait, the more delay it gets >>>>>> (30 seconds and more). It is no usable like this. >>>>>> >>>>>> I tried to play with the latencies of source, sink and the tv delay >>>>>> itself without sucess. I also tried streaming with pacat directly as >>>>>> described here: >>>>>> https://thelinuxexperiment.com/fix-pulseaudio-loopback-delay/ >>>>>> >>>>>> I also tried to change different parameters of the loopback module or >>>>>> the sources/sinks, but that did not help. I never changed any global >>>>>> pulseaudio config to avoid larger configuration issues. The CPU >>>>>> usage of >>>>>> pulseaudio is at 3% with the loopback module >>>>>> >>>>>> Can anyone help me to get rid of this lag? >>>>>> >>>>> Hi Nico, >>>>> >>>>> which version of PA are you using? Can you provide logs? >>>>> >>>>> Regards >>>>> Â Â Â Â Â Â Â Â Â Â Â Â Â Georg >>>>> >>>> Hi Georg, >>>> oh sure I completely forgot: >>>> >>>> pulseaudio 11.1-1 (Arch Linux) >>>> uname -a: Linux zebes 4.14.15-1-ARCH #1 SMP PREEMPT Tue Jan 23 21:49:25 >>>> UTC 2018 x86_64 GNU/Linux >>>> >>>> Here is a logfile: >>>> LANG=C pulseaudio -vvvv --log-time=1 > ~/pulseverbose.log 2>&1 >>>> https://gist.github.com/NicoHood/85976f426e1621e599253ee1a95230dd >>>> >>>> Regards >>>> Nico >>> This is weird. It looks like the source sample rate is so much higher >>> than the sink rate that module-loopback can't adapt. No idea why >>> this happens. Does it work with another input? >>> >>> >> I've tested it also with the builtin front microphone input (2nd >> revision on gist) and with the PCIE Analog line in (3rd gist revision). >> You can view the changes here: >> https://gist.github.com/NicoHood/85976f426e1621e599253ee1a95230dd/revisions >> >> The problem only occurs with the digital, optical TOSLINK input from my >> Samsung TV. For some other reason the sound distortion for the analog >> input is now (temporary) gone. However I still want to get that TOSLINK >> running :/ >> _______________________________________________ >> pulseaudio-discuss mailing list >> pulseaudio-discuss at lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss >> > As an additional test I send the audio to the TOSLINK output of the > soundcard, back to its input and setup loopback on the input again (to > the USB soundcard). With this method the sound has no lag. The > difference is that the toslink signal comes from the soundcard itself > rather than the TV. I have some smaller noises/distortion however > sometimes. Here is the log: > https://gist.github.com/NicoHood/6ef237649d97eaa69d9a78dd91eff34a > Somehow this still sounds like a sample rate mismatch. (A wild guess, I do not know how the signal chain works for a TOS-link) Have you tried setting your card to 48kHz? You can change default-sample-rate and alternate-sample-rate in daemon.conf both to 48000 and restart pulse to enforce this.
