Hi, Attached patch fixes the MKV muxer when trying to write Void elements that have a size < 10. The current code subtracts 1 from the size, which accounts for the element ID byte, but it doesn't account for the additional size byte. This causes the Void element to take up 1 more byte than intended, which will corrupt the file.
A simple example to reproduce the issue: $ ffmpeg -f lavfi -i testsrc -vframes 1 -reserve_index_space 38 test.webm $ mkvinfo test.webm [...] test.webm: Error in the Matroska file structure at position 479. Resyncing to the next level 1 element. Resync failed: no valid Matroska level 1 element found.
0001-avformat-matroskaenc-fix-Voids-with-size-10.patch
Description: Binary data
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