Which is the preferred resample for Decklink out?

[alatteri]

Hi,

What is the preferred resampler for fixing the Decklink out audio issue? I see that recently there was a check-in for parallel Speex.

Thanks,
Alan

[alatteri]

In my testing, speex produces audible clicks in the output, and they are not reported as Buffer Overflows. soxr does not produce these audible errors, so I will stick with that.

[MartinPulec]

Thanks for the info, this agrees with the info from from guys at Sohonet, I believe that this is caused when changed resample rate, because Speex resampler is destroyed&recreated while SoxR allows changing the rate on fly, keeping its internal state. So if there occurs sample rate change, it does produce the artifacts.

So I've pushed a change that implicitly select SoxR for DeckLink drift fixer.

I don't think speex is bad in general, if using it for "static" resample, the above doesn't occur. The true is that SoxR presumably has better quality (from the article, I've found). On the other hand, Speex doesn't add a delay. From the performance point of view I think it is a tie – SoxR should be be better but it is used as single threaded. Speex is multi-threaded in UG.