2020-12-14, 06:18 PM
(2020-12-14, 06:03 PM)spoRv Wrote: No no, I mean that sampling rate is maintained at 44056Hz but the software display it as 44100Hz - but at least VirtualDub capture did display at 44056Hz...
May you try a capture "on the fly" using VirtualDub and a digital input, and check the sampling rate displayed? I'd make it myself if only I couldtoo curious to know!
I understand, but that would mean that CD audio is also actually 44056 Hz, given that the data stored on the LD is identical to CD format. And I'm almost certain it's not.
Software like RX (which I do the resampling in) and Audacity (which is mostly what I use for alignment) don't know if the audio is off a LaserDisc or a CD or what, they just render it out as it is. If I fed 44056 Hz audio to Audacity as 44100 Hz, then the samples would be displayed as "sped up" (too frequent) and this would put it out of alignment with my 100%-definitely-44100 Hz resampled analogue capture (recorded at 48000 Hz, resampled to 44100 Hz in RX - *not* 44056 Hz). But it doesn't. They line up very very precisely, in many cases I've seen thus far they've actually remained accurate *to the individual sample* from start to finish once the starts are lined up. If the correct sample rate for the PCM was actually 44056 Hz, then rendering it as 44100 Hz would mean the digital track would get significantly ahead of the analogue one. It doesn't.
I've never attempted a capture in VirtualDub, I just use it for monitoring/resyncing stuff after capture, so I'm probably not the best person to check that specifically.
