On 4/21/19, Nicolas George <geo...@nsup.org> wrote: > Paul B Mahol (12019-04-19): >> Generic resampling via aresample is completely another filtering that >> have >> nothing to do with this filters, for more info read: >> >> https://www.oblique-audio.com/technique/oversampling > > Quite the opposite: this page makes it rather clear that oversampling is > a kind of resampling, with specific settings to ensure particular > properties of the spectrum.
It is not kind of resampling. Resampling is specific and belongs to separate library. The oversampling is another thing, and doing only upsampling/downsampling via libswresample is fragile/incomplete, as you need some kind of lowpass. (be it IIR, FIR or simple FFT) after upsample and before downsample. That is why it best fit into lavfi because it is just one block of processing with multiple solutions. And not one way do it all solution, set once and forget what it does. > > As such, it should go into the generic resampling filter (or even > library), enabled by options. That way, it is available not only > explicitly from expert users but also automatically, when filters > declare specific samples rates. Does not make sense to provide this into libswresample library. Also how that could be exported? It does not belong there. It would just confuse users, more because it supports only integer factor multiplication/divide of rates. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
