David Conrad <[email protected]> added the comment:

The file is buggy; WebM specs clearly say that all frames must have 
strictly increasing timestamps. Patch to fix this on the ML.

(and who really mixes blockgroup and simpleblock in the same stream...)

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title: WebM files with altref frames decode incorrectly -> WebM files with 
duplicated timestamps decode incorrectly

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FFmpeg issue tracker <[email protected]>
<https://roundup.ffmpeg.org/issue2052>
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