On 7/16/19, Reino Wijnsma <[email protected]> wrote: > On 16-7-2019 17:45, Paul B Mahol <[email protected]> wrote: >> On 7/16/19, Reino Wijnsma <[email protected]> wrote: >>> I can't use these filters. Have a look at the Youtube video please. >>> I wish it was a simple matter of just concatenating all segments, but it >>> isn't, because the segments don't align perfectly. >>> Each segments has to start at a very specific time. >>> Then it's a matter of mixing everything at full volume(!), so there's no >>> fading involved at all. >> acrossfade can just *join* it with nofade curve, which basically disables >> fading. > > But that's the point, I need to *mix*all segments, not join/concatthem. > >> On 7/16/19, Reino Wijnsma <[email protected]> wrote: >>> Do you happen to know why ffmpeg reports a completely wrong duration? >>> >>> Related question/suggestion: >>> It's really cumbersome to always having to specify the delay for all(!) >>> channels: [1]adelay=158792S|158792S[E2]; >>> How about a default behaviour where specifying an amount of >>> milliseconds/samples once(!) applies to all channels: >>> [1]adelay=158792S[E2]; >>> And if you want a specific delay for another channel, then you can do so >>> as >>> is already possible. >>> This would make my commandline a lot shorter! >> The thing with amix is that by *reducing volume* by mixing and adding it >> back with volume, >> you basically loose quality. It is more obvious with float sample >> format then double one. > > I'm actually trying to prefend volume reduction. I only want to mix all > segments. > > (I noticed I forgot to attach the Avisynth script I used years ago. Attached > now.) > In the Avisynth script I align all segments (with sample precision) and mix > everything with full volume: MixAudio(clip1,clip2,1.0,1.0) > > ffmpeg.exe -h filter=amix > [...] > weights <string> ..F.A.... Set weight for each input. > (default "1 1") > > I figure "1 1" does the same as MixAudio(clip1,clip2,1.0,1.0), doesn't it? > But amix still reduces the volume dramatically. > > Let me ask you this: How can I do MixAudio(clip1,clip2,1.0,1.0) with ffmpeg > leaving the volume completely untouched?
There is currently no way. > >> Option could be added to amix filter to just sum samples as is. > > You mean the adelay filter, right? No. > >> Also what ffmpeg version you are using? > Please see my first post. > > On 16-7-2019 18:36, Paul B Mahol <[email protected]> wrote: >> Actually ffmpeg is behaving correctly, your [29]adelay is missing one S. > Well I'll be darned. A typo. Thanks! > That solves that problem, but the volume issue remains. > > -- Reino > _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
