Le 27/03/2018 à 22:45, Dave Rice a écrit :
On Mar 27, 2018, at 4:33 PM, wm4 <nfx...@googlemail.com> wrote:
On Tue, 27 Mar 2018 16:11:11 -0400
Dave Rice <d...@dericed.com> wrote:
On Mar 27, 2018, at 4:01 PM, Derek Buitenhuis <derek.buitenh...@gmail.com>
wrote:
On 3/27/2018 8:52 PM, Rostislav Pehlivanov wrote:
I think we should drop the internal crap if the tools and the API support
it. Would also solve a lot of issues like ffmpeg.c not trimming the start
frame (so people complain all the time about longer files).
I personally agree, but I thought I'd be diplomatic about it, since it would
technically be losing a 'feature', since it would no longer Just Work(ish)
and require user applications to apply timelines themselves - and I figured
some would argue that point.
+1 I’m willing to contribute what information or samples would be needed to
help with Matroska support with virtual timelines. IMO, this would be a
valuable feature to have in ffmpeg.
Dave Rice
Some explanations how this interacts with editions would be good.
I put an example with two editions at
https://archive.org/download/chapters_test/chapters_test.mkv which mimics a
digitized video tape. One edition depicts the stored video encoding in its
entire presentation and the other default edition plays from the video encoding
selectively. When the file is played in VLC, the default edition is used to
show a shortened presentation, but the other editions may be selected within
the Program menu option. In the proposal there should be an option to mimic the
current behavior and ignore the editions (equivalent of -ignore_editlist in
mov), to use the first default edition, or to select a specific edition.
For the record, the ordered chapters with segment linking in VLC have
been fixed recently with this issue
https://trac.videolan.org/vlc/ticket/19101
There is a lengthy set of sample files with ordered chapters and
multiple segments. That's basically the most complex case that can exist.
I don't think the API covers segment linking, nor how libavformat would
look around in the file system if there are available segments
(something we do in VLC). So not sure an API for some case not covered
would make sense.
Or documenting ordered chapters and segment linking in the mkv "spec"
at all.
This document, http://mod16.org/hurfdurf/?p=8 <http://mod16.org/hurfdurf/?p=8>,
is unofficially a good resource on that.
More officially the Cellar working group has this section on Linked Segments:
https://tools.ietf.org/html/draft-lhomme-cellar-matroska-04#section-23
<https://tools.ietf.org/html/draft-lhomme-cellar-matroska-04#section-23>, and this one on Ordered
Editions: https://tools.ietf.org/html/draft-lhomme-cellar-matroska-04#section-10.1.2.3
<https://tools.ietf.org/html/draft-lhomme-cellar-matroska-04#section-10.1.2.3>. This
documentation is a work in progress so comments/reviews/suggestions are welcome (issues can be filed at
https://github.com/Matroska-Org/matroska-specification
<https://github.com/Matroska-Org/matroska-specification> or via
https://www.ietf.org/mailman/listinfo/cellar <https://www.ietf.org/mailman/listinfo/cellar>).
Dave Rice
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