On 4/22/19, Paul B Mahol <one...@gmail.com> wrote: > On 4/22/19, Nicolas George <geo...@nsup.org> wrote: >> Paul B Mahol (12019-04-21): >>> https://dspguru.com/dsp/faqs/multirate/resampling/ >>> >>> Resampling involves interpolation. >>> If I do resampling with aresample and resampling with factor 2 from >>> 44100 to 88200 >>> I can see there is still some spectrum data in highest frequencies. >> >> Resampling MAY involve interpolation, to enhance the subjective quality >> of the output. > > It is not MAY, it MUST involve interpolation in almost any scenario. > >> >>> If you haven't noticed, this is just upsampling/downsampling without >>> lowpass. >>> And that is not resampling in any way. >> >> No matter how many times you repeat it, saying that changing the sample >> rate is not resampling will not make it true. > > By your flawed reasoning asetrate filter is doing resamping too. > >> >>> That is just your opinion now, you need to provide technical terms >>> to support your statements. >> >> I have given technical considerations: we have automatic sample rate >> negotiation. These filter would not fit with it. > > If you haven't tried them, they fit well with sample rate negotiation. > Filters change sample rate metadata by integer factor up or down. > >> >> What have you provided besides your opinion and links to generic >> considerations that do not substantiate your views? > > I have provided actual facts, and not opinions unlike you. > >> >>> Another option to aresample filter would just confuse users. >> >> Less so than yet another pair of filters that do almost exactly the same >> thing as others. > > No filter in libavfilter does what those filters do. > > And there is reason why SoX have those as separate filters and not some > strange combination with their generic resampling effect. >
As there appears to be no more comments or valid arguments against this set I will apply it. _______________________________________________ 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".
