[FFmpeg-devel] [WANTED] Fix incorrect audio duration reporting

[Paul B Mahol]

On Sat, Mar 13, 2021 at 3:48 PM Michael Niedermayer <michael at niedermayer.cc>
wrote:

> On Sat, Mar 13, 2021 at 03:11:34PM +0100, Paul B Mahol wrote:
> > On Sat, Mar 13, 2021 at 1:30 PM Michael Niedermayer
> <michael at niedermayer.cc>
> > wrote:
> >
> > > On Thu, Mar 11, 2021 at 07:33:53PM +0100, Paul B Mahol wrote:
> > > > Hi,
> > > >
> > > > With latest master and with any audio only file, using "ffmpeg -i
> file -f
> > > > null -" reports incorrect duration.
> > >
> > > ./ffmpeg -i ~/videos/1sec-zero.mp3 -f null -
> > > shows durations at 2 points in the output
> > > Duration: 00:00:01.03, start: 0.023021, bitrate: 129 kb/s
> > > size=N/A time=00:00:00.98 bitrate=N/A speed= 620x
> > >
> > > the first is exactly the same in ffmpeg 4.3, 3.4 and 2.8.17
> > > The 2nd is a regression since 50b49f833ae2f7d33bd2a99776fed6cb692c171a
> > >
> >
> > Check it with wav files.
>
> No difference between master and 4.3 or 3.4
> ./ffmpeg  -i ~/videos/1sec-zero.wav -f null -
>  Duration: 00:00:01.01, bitrate: 1536 kb/s
> size=N/A time=00:00:01.00 bitrate=N/A speed=1.02e+03x
>
> Duration: 00:00:01.01, bitrate: 1536 kb/s
> size=N/A time=00:00:01.00 bitrate=N/A speed= 993x
>

Now try with filtering, loudnorm or dynaudnorm, there is even bigger
difference.


>
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Never trust a computer, one day, it may think you are the virus. -- Compn
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".