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From: Nuo Mi <nuomi2021@gmail.com>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH] avformat/movenc: fix VVC encoding with leading pictures
Date: Sun, 25 May 2025 10:08:50 +0800
Message-ID: <CAFXK13fqrO9BDzgSD5ofGcjRm8G7AiyB-_F-bjT-pDnuad03KA@mail.gmail.com> (raw)
In-Reply-To: <836d20e7-e4c5-42a3-9784-8715dc41e764@hege.cc>

On Thu, May 22, 2025 at 4:35 PM Gabriel Hege <g+ffmpeg@hege.cc> wrote:

>
> On 17.05.25 04:26, Nuo Mi wrote:
> > On Fri, May 16, 2025 at 7:05 PM Gabriel Hege <g+ffmpeg@hege.cc> wrote:
> >
> >> This is a resubmission with a corrected commit message.
> >>
> >>
> >> The default behavior for VVenC (since v1.10.0) is to create an IDR with
> >> leading pictures for the first picture in decoding order (POC 32). This
> >> leads to FFmpeg generating an edit list with an empty entry, skipping
> >> the leading pictures.
> >>
> >> This patch fixes the calculation for the start_pts, while the DTS is
> >> negative (as produced by libvvenc).
> >>
> >>
> >> How to reproduce the issue (needs --enable-libvvenc and a recent
> >> libvvenc, e.g. v1.13):
> >>
> > Hi Gabriel,
> > Thank you for your patch. It addresses the MP4 issue, but it looks like
> MKV
> > has the same problem as well.
>
> Hi Nuo Mi,
>
> I'm sorry I don't really have an understanding of the MKV format. I had
> a quick look at the code, but the processing seems quite different and I
> didn't really find the corresponding code locations to fix the problem
> there.
>
Hi Gabriel,
Thank you for checking.
Could you help create a similar issue for MKV? Someone familiar with MKV
might pick it up.

Hi  James and all,
If no one objects, I’ll push this.

Thank you.

>
>
> > Hi @James Almer <jamrial@gmail.com> ,
> > Could you please take a look at the patch when you have a moment? You've
> > been the most active contributor to this file recently.
> >
> >>
> >> Encode VVC directly into MP4 container:
> >> ./ffmpeg -i /data/YUV/foreman_352x288_30Hz_i420_8.y4m -an -preset faster
> >> -vcodec vvc test.mp4
> >>
> >>     -> encodes 300 frames.
> >>
> >> Decode to YUV (or play back using ffplay):
> >> ./ffmpeg -i test.mp4 test.yuv
> >>
> >>     -> outputs 271 frames
> >>
> >> When dumping the mp4-structure using 'MP4Box -diso test.mp4', I see the
> >> following EditListBox, which skips the first couple of
> >> frames:<EditListBox Size="40" Type="elst" Version="0" Flags="0"
> >> Specification="p12" Container="edts" EntryCount="2">
> >> <EditListEntry Duration="1033" MediaTime="-1" MediaRate="1"/>
> >> <EditListEntry Duration="8967" MediaTime="18432" MediaRate="1"/>
> >> </EditListBox>
> >>
> >>
> >> With the fix applied 300 frames are decoded as expected and the
> >> EditListBox looks like this:
> >> <EditListBox Size="28" Type="elst" Version="0" Flags="0"
> >> Specification="p12" Container="edts" EntryCount="1">
> >> <EditListEntry Duration="10000" MediaTime="2560" MediaRate="1"/>
> >> </EditListBox>
> >> _______________________________________________
> >> ffmpeg-devel mailing list
> >> ffmpeg-devel@ffmpeg.org
> >> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >>
> >> To unsubscribe, visit link above, or email
> >> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> >>
> > _______________________________________________
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> > ffmpeg-devel@ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
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  reply	other threads:[~2025-05-25  2:09 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-05-16 11:05 Gabriel Hege
2025-05-17  2:26 ` Nuo Mi
2025-05-22  8:34   ` Gabriel Hege
2025-05-25  2:08     ` Nuo Mi [this message]
2025-05-27 14:52       ` Gabriel Hege
2025-05-31  1:51         ` Nuo Mi

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