Re: [FFmpeg-devel] 5.0 release

[Michael Niedermayer <michael@niedermayer.cc>]

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On Mon, Jan 03, 2022 at 09:29:40PM +0100, Paul B Mahol wrote:
> On Mon, Jan 3, 2022 at 9:14 PM Michael Niedermayer <michael@niedermayer.cc>
> wrote:
> 
> > On Mon, Jan 03, 2022 at 08:25:44PM +0100, Paul B Mahol wrote:
> > > On Mon, Jan 3, 2022 at 7:58 PM Michael Niedermayer <
> > michael@niedermayer.cc>
> > > wrote:
> > >
> > > > On Mon, Jan 03, 2022 at 07:04:48PM +0100, Paul B Mahol wrote:
> > > > > On Mon, Jan 3, 2022 at 6:18 PM Hendrik Leppkes <h.leppkes@gmail.com>
> > > > wrote:
> > > > >
> > > > > > On Mon, Jan 3, 2022 at 5:14 PM Michael Niedermayer
> > > > > > <michael@niedermayer.cc> wrote:
> > > > > > >
> > > > > > > On Mon, Jan 03, 2022 at 06:31:37AM +0100, Jean-Baptiste Kempf
> > wrote:
> > > > > > > > On Fri, 31 Dec 2021, at 20:40, Michael Niedermayer wrote:
> > > > > > > > >> It would be nice to have a public date set a few days into
> > the
> > > > > > future.
> > > > > > > > >
> > > > > > > > > yes, i intended to do that, unless people wanted a ASAP/NOW
> > > > branch
> > > > > > > >
> > > > > > > > So what are the open topics, besides the Audio Channel Layout
> > API?
> > > > > > >
> > > > > > > the mov issue was fixed, channels dont seem to happen
> > > > > > > theres a regression with 946493eb3e072b499909f606625480c928834a44
> > > > > > > that ive reported 1 day after the patch was posted and pinged 11
> > days
> > > > > > later
> > > > > > >
> > > > > > > 221073 rsF 1112 16:11 To ffmpeg-devel (2,3K) Re: [FFmpeg-devel]
> > > > > > [FFmpeg-cvslog] avcodec/mlpdec: cover case when >2 channels are in
> > > > single
> > > > > > substream
> > > > > > > 221074  sF 1123  0:00 To ffmpeg-devel (3,5K) └─>
> > > > > > >
> > > > > > > thats not branch blocking, a bugfix is just a normal backport
> > > > > > > I dont have the file that
> > 946493eb3e072b499909f606625480c928834a44
> > > > fixes
> > > > > > > so trying to fix it is like working blindfolded, thats why ive
> > so far
> > > > > > > waited for the author to respond and take a look
> > > > > > >
> > > > > >
> > > > > > As far as I can tell, the recent mlpdec changes seem to be
> > intended to
> > > > > > fix playback of streams made by our own experimental encoder, and
> > not
> > > > > > independent samples.
> > > >
> > > > How can that be reproduced ?
> > > > I tried with a 5.1 stream and the decoded output is not changing with
> > this
> > > > patch
> > > >
> > > >
> > > > > > So perhaps those should be reverted for a stable release (or
> > > > > > generally), seeing as there is no response 2 months later, and no
> > > > > > indication what they actually fix.
> > > > > >
> > > > > > The  available whitepapers and bitstream syntax document on
> > TrueHD/MLP
> > > > > > also do not seem to support more then 2 channel in the first
> > > > > > substream, limiting it to a stereo presentation in the first, up
> > to 6
> > > > > > channel in the second, and up to 8 channel in the third substream
> > (and
> > > > > > 16 in the extended substream)
> > > > > >
> > > > >
> > > > > This statement is not in sync with reality.
> > > > >
> > > > > I have sample that 946... fixes, single stream with > 2 channels.
> > > >
> > > > Iam not sure i understand what you mean exactly but
> > > >
> > > > the sample which it breaks is here:
> > > > https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket1726/Mono.thd
> > > >
> > > > can you look into this issue, you as author of the change maybe
> > > > remember why you did it and so are better qualified to adjust it.
> > > >
> > >
> > > Sorry but that sample was never decoded properly. As it is not mono and
> > it
> > > is not stereo.
> >
> > around the time of 3.2 it was decoded as mono and it sounds reasonable
> > after that until 946... it was decoded as stereo with only the left channel
> > after 946... it now doesnt decode at all
> >
> > it would be nice if we could support this kind of file
> >
> 
> To really support it, it needs both streams to be presented.

yes

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No great genius has ever existed without some touch of madness. -- Aristotle

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