[Bug 784969] Matroska/Opus generated with GStreamer does not play in VLC

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784969

--- Comment #2 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Tim-Philipp Müller from comment #1)
> WRN00C: Unknown element in TrackEntry [56][BB] at 421 (size 4 total 7)
> WRN00C: Unknown element in TrackEntry [56][AA] at 428 (size 3 total 6)

SeekPreroll and CodecDelay also written by ffmpeg (with the same values) and
required for Opus.

> WRN201: Unknown 'BlockVirtual' for read profile 'matroska v2' in BlockGroup
> at 211505

Where do you see that? We don't write BlockVirtual


But we write real BlockGroups with Blocks, while ffmpeg writes SimpleBlocks
(except for the last). We should do that too as it causes overhead to not use
SimpleBlocks.

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