Comment # 14
on bug 64503
from Andy Furniss
(In reply to comment #0) > (originally reported to Fedora: > https://bugzilla.redhat.com/show_bug.cgi?id=954009) > > I've recently started trying out 24 Hz again as my TV handles it better, and > XBMC is finally at a point where they can keep things synced up when playing > at exactly the monitor refresh rate. > > Unfortunately that broke the HDMI audio output. If I try to output audio > when the refresh rate is at 24 Hz, the receiver will lose audio sync every > few minutes, resulting in silence until it regains sync. > > I've tried the following: > > - Sending audio over SPDIF from the onboard audio to the same receiver > works fine. Another cable though, and cannot handle high-bitrate formats, so > hardly a long term solution. > > - Audio format doesn't seem to matter. I get glitches with PCM, AC3 and > DTS. DTS is the worst, but that might just be because it requires more > effort to sync back up again. > > - It's not xbmc that gets confused as sending audio from an entirely > different program results in the same audio glitches (I tried mplayer with > -vo null in the background). > > - Doesn't seem to be a application buffering issue as I see no spikes in > either xbmc's or mplayer's sync statistics when the glitch appears. > > > This is with kernel-3.8.7-201.fc18.x86_64. Well I guess my bare bones LFS setup is very different to fedora, but I can't reproduce this. Kernel drm-next recent-ish with radeon HD4890. Can only test PCM into TV with mplayer + alsa (pulse not installed) cpufreq set to performance, GPU on low. TV screen set below monitor screen. Tried 11 minute 44.1k CD track and 20 mins of blu-ray -vo vdpau 48k stereo and didn't hear any glitches at all. Of course blu-ray was 23.976 and modeline was 24, but I doubt that's relevant, mplayer will tweak video rate to keep audio sync and -framedrop was given. FWIW this is my 24Hz line as shown by xrandr --verbose, maybe yours is different? 1920x1080 (0x2cd) 74.2MHz +HSync +VSync h: width 1920 start 2558 end 2602 total 2750 skew 0 clock 27.0KHz v: height 1080 start 1084 end 1089 total 1125 clock 24.0Hz Having never used pulse I don't know if it's easy to bypass (assuming you are using it), mplayer -ao alsa:device=hw=1.3 may work (assumes cat /proc/asound/cards shows HDMI as 1)
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