Re: Sound lag over HDMI
Alexander Motin m...@freebsd.org wrote: I don't know what to say. I am now using HDMI audio from NVIDIA card to quite old external 5.1 receiver with XBMC every day, and I haven't noticed lags. The only potentially related effect I have noticed is that my receiver eats first second or about that of playback stream. That's from the receiver examining the incoming data to see if it is AC-3, DTS, or plain PCM. -- Christian naddy Weisgerber na...@mips.inka.de ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: Sound lag over HDMI
2013/7/12 Alexander Motin m...@freebsd.org: On 12.07.2013 23:54, Ulrich Spörlein wrote: I'm trying to setup XBMC on a -CURRENT box with an IvyBridge CPU and GPU. While testing playback via mplayer on a LG TV over HDMI, I noticed that sound is lagging video by about 100-200ms or so. When I switch to using the jack outputs powered by some Realtek chip, audio is perfectly fine. Is HDMI lag a known problem? Can this be fixed? root@coyote:~# dmesg | egrep vgapci\|pcm vgapci0: VGA-compatible display port 0x3000-0x303f mem 0xe000-0xe03f,0xc000-0xdfff irq 16 at device 2.0 on pci0 agp0: IvyBridge mobile GT2 IG on vgapci0 pcm0: Realtek ALC888 (Rear Analog) at nid 20 and 24 on hdaa0 pcm1: Realtek ALC888 (Rear Digital) at nid 30 and 31 on hdaa0 pcm2: Intel Panther Point (HDMI/DP 8ch) at nid 6 on hdaa1 pcm3: Intel Panther Point (HDMI/DP 8ch) at nid 7 on hdaa1 drmn0: Intel IvyBridge (M) on vgapci0 I don't know what to say. I am now using HDMI audio from NVIDIA card to quite old external 5.1 receiver with XBMC every day, and I haven't noticed lags. Before that I've also successfully used SPDIF connection for the long time. Though I've never specially tested it somehow other then watching movies. :) If you have some good testing methodology -- please, welcome to share. By the HDA driver HDMI is handled exactly the same way as analog output from the point of data buffering, so I would not expect there major differences. You may try to experiment with hw.snd.latency sysctl to tune buffering in kernel to see whether it affect the result. Also you may compare delays when doing AC3/DTS pass-through with case of software decoding and discrete (multichannel) PCM playback. The only potentially related effect I have noticed is that my receiver eats first second or about that of playback stream. It makes short sounds like GUI event notifications inaudible sometimes. I guess that could be made to restore audio sync after some unavoidable startup delay, but that is only my guess. Hmm, weird. I've rebooted the machine (it was up more than 30d before I ever started up Xorg or any sound-using application), and maybe that fixed some contigmalloc issues or something, because I can no longer reproduce the problem. I've had problems like this on an old laptop, where if I didn't start X11 within 24h of rebooting, it wouldn't start up. This system is using ZFS of course, so unless you take memory early on, ZFS will have eaten it :) Anyway, thanks for your suggestions and I can confirm everything's fine. After fixing the /dev/dri/card0 permission problem, even XBMC works like a charm on this system. Cheers, Uli ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Sound lag over HDMI
Hey, I'm trying to setup XBMC on a -CURRENT box with an IvyBridge CPU and GPU. While testing playback via mplayer on a LG TV over HDMI, I noticed that sound is lagging video by about 100-200ms or so. When I switch to using the jack outputs powered by some Realtek chip, audio is perfectly fine. Is HDMI lag a known problem? Can this be fixed? root@coyote:~# dmesg | egrep vgapci\|pcm vgapci0: VGA-compatible display port 0x3000-0x303f mem 0xe000-0xe03f,0xc000-0xdfff irq 16 at device 2.0 on pci0 agp0: IvyBridge mobile GT2 IG on vgapci0 pcm0: Realtek ALC888 (Rear Analog) at nid 20 and 24 on hdaa0 pcm1: Realtek ALC888 (Rear Digital) at nid 30 and 31 on hdaa0 pcm2: Intel Panther Point (HDMI/DP 8ch) at nid 6 on hdaa1 pcm3: Intel Panther Point (HDMI/DP 8ch) at nid 7 on hdaa1 drmn0: Intel IvyBridge (M) on vgapci0 Cheers, Uli ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: Sound lag over HDMI
On 12.07.2013 23:54, Ulrich Spörlein wrote: I'm trying to setup XBMC on a -CURRENT box with an IvyBridge CPU and GPU. While testing playback via mplayer on a LG TV over HDMI, I noticed that sound is lagging video by about 100-200ms or so. When I switch to using the jack outputs powered by some Realtek chip, audio is perfectly fine. Is HDMI lag a known problem? Can this be fixed? root@coyote:~# dmesg | egrep vgapci\|pcm vgapci0: VGA-compatible display port 0x3000-0x303f mem 0xe000-0xe03f,0xc000-0xdfff irq 16 at device 2.0 on pci0 agp0: IvyBridge mobile GT2 IG on vgapci0 pcm0: Realtek ALC888 (Rear Analog) at nid 20 and 24 on hdaa0 pcm1: Realtek ALC888 (Rear Digital) at nid 30 and 31 on hdaa0 pcm2: Intel Panther Point (HDMI/DP 8ch) at nid 6 on hdaa1 pcm3: Intel Panther Point (HDMI/DP 8ch) at nid 7 on hdaa1 drmn0: Intel IvyBridge (M) on vgapci0 I don't know what to say. I am now using HDMI audio from NVIDIA card to quite old external 5.1 receiver with XBMC every day, and I haven't noticed lags. Before that I've also successfully used SPDIF connection for the long time. Though I've never specially tested it somehow other then watching movies. :) If you have some good testing methodology -- please, welcome to share. By the HDA driver HDMI is handled exactly the same way as analog output from the point of data buffering, so I would not expect there major differences. You may try to experiment with hw.snd.latency sysctl to tune buffering in kernel to see whether it affect the result. Also you may compare delays when doing AC3/DTS pass-through with case of software decoding and discrete (multichannel) PCM playback. The only potentially related effect I have noticed is that my receiver eats first second or about that of playback stream. It makes short sounds like GUI event notifications inaudible sometimes. I guess that could be made to restore audio sync after some unavoidable startup delay, but that is only my guess. -- Alexander Motin ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
