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
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>
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