On 5/7/19, Paul B Mahol <one...@gmail.com> wrote: > On 5/6/19, Marton Balint <c...@passwd.hu> wrote: >> >> >> On Mon, 6 May 2019, Marton Balint wrote: >> >>> >>> >>> On Mon, 6 May 2019, Paul B Mahol wrote: >>> >>>> On 5/6/19, Marton Balint <c...@passwd.hu> wrote: >>>>> >>>>> >>>>> On Sat, 4 May 2019, John Warburton wrote: >>>>> >>>>>> On Sat, May 4, 2019 at 3:34 PM Nicolas George <geo...@nsup.org> >>>>>> wrote: >>>>>> >>>>>>> John Warburton (12019-05-04): >>>>>>> >>>>>>> > Is there a patch I can use to test scaletempo to compare it >>>>>>> > against >>>>>>> atempo? >>>>>>> > It'll be no trouble to do that with the normal audio that is >>>>>>> time-adjusted >>>>>>> > on that radio station. It may be that its increased quality is >>>>>>> > most >>>>>>> >>>>>>> John, we would appreciate your input about whether these new >>>>>>> implementation of atempo is superior or equal to the existing one >>>>>>> with >>>>>>> regard to your needs. >>>>> >>>>> I tested scaletempo (with default settings) and it is definitely worse >>>>> than atempo for small scaling factors like 25/24. >>>>> >>>> >>>> Have you tried other scaling factors? >>>> How you done testing? >>> >>> Simple hearing tests. I hear audible artifacts (a kind of audio >>> stuttering) with scaletempo. Here are some files where it is noticable: >>> >>> fate-suite/delphine-cin/LOGO-partial.CIN >>> fate-suite/real/spygames-2MB.rmvb >>> fate-suite/wmapro/Beethovens_9th-1_small.wma >>> fate-suite/dts/dts.ts >>> >>> The last one is noticable even with 2x scaling. >> >> Another one, audible with any (0.5, ~1, 2) scaling: >> >> fate-suite/paf/hod1-partial.paf >> > > OK, vote and patch dropped. > > Even by using basically same algorithm, it is very slow to get same > quality because does not use FFT for cross-correlation. >
I got into possession of code that is better than atempo for very small scale factors (0.5). So I gonna write new filter which would also be able to change both tempo and pitch at same time. _______________________________________________ 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".