2011/8/21 Tanu Kaskinen <tanuk at iki.fi>: > On Sat, 2011-08-20 at 23:31 +0300, R?mi Denis-Courmont wrote: >> It is thus essential that the stream gets triggered approximately on time, >> whether that is initially, upon resuming from pause, or upon recovering from >> underflow. Otherwise, resampling kicks in and you get to hear Doppler. > > The resampling shouldn't be hearable if it speeds up the stream at most > 2% (or at least there are such comments in Pulseaudio source code where > similar adaptive resampling is done). I'd guess slight resampling would > be good for small drop-outs. For longer gaps the catch-up time might be > too long and the initial difference between video and audio too > noticeable, so dropping some audio would be better to get done with it > quickly. Actually, that it 2 pro-mille and refers to the jump in sample rate that should be inaudible. The total difference from the original rate that can't be detected is really dependent on thinks like type of source material, absolute pitch of the listener, and whether the audio is playing alone or together with something else. For pulseaudio I limited to the total deviation from the original rate to 25%, which is certainly audible, but it should get there slowly enough that you can't hear any doppler-like effects. Maarten
