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On 64bit Arch running with Pulseaudio, I get jittery/stuttering sound when I try to watch Flash videos in Firefox (but these play fine in Chrom{e|ium}) and in the game Rimworld. I don't have anything unusual about my Pulseaudio setup, and sound works fine outside of the aforementioned contexts.
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some more information would be cool, for starters
pacmd list-cards
aplay -lshould get us somewhere. Some glassball guessing. do you have tsched=0 set to your udev_detect in your default.pa? If so why? If not refer to https://wiki.archlinux.org/index.php/Pu … PulseAudio for a method to calculate the correct fragment sizes for your specific card
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