On Tue, May 27, 2025 at 10:52 PM Gabriel Hege <g+ffm...@hege.cc> wrote:
> On 25.05.25 04:08, Nuo Mi wrote: > > On Thu, May 22, 2025 at 4:35 PM Gabriel Hege <g+ffm...@hege.cc> wrote: > > > >> > >> On 17.05.25 04:26, Nuo Mi wrote: > >>> On Fri, May 16, 2025 at 7:05 PM Gabriel Hege <g+ffm...@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. > > I filed a bug report: https://trac.ffmpeg.org/ticket/11611 Thank you. Gabriel Applied. > > > > > Hi James and all, > > If no one objects, I’ll push this. > > > > Thank you. > > > >> > >> > >>> Hi @James Almer <jamr...@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-requ...@ffmpeg.org with subject "unsubscribe". > >>>> > >>> _______________________________________________ > >>> 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". > >> > >> _______________________________________________ > >> 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". > >> > > _______________________________________________ > > 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". > > _______________________________________________ > 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". > _______________________________________________ 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".
