First of all: Many thanks for packman. I'm currently recoding my video archiv and found, that there are often problems with subtitle streams, because the dts starts again with 0 after some time (I think, it is at jumping from DVD layer 1 to 2, but I'm not sure). There is code in ffmpeg.c to handle such nonmonolithic dts errors in video and audio streams, but for subtitle streams it is not used. Some years ago the dts time fix has been used also for subtitle streams, but this has been removed while changing the code in ffmpeg.c. There is a bug report with an (old) patch for this in the ffmpeg git repository, but this has never found its way to the release. I've adapted the patch for current ffmpeg from packman. Based on ffmpeg-3.4.2-6.2.src.rpm for Tumbleweed (http://packman.links2linux.org/ downloadsource/858298/ffmpeg-3.4.2-6.2.src.rpm) you could add the attached patch (hope attachments work for this list) to fix this problem for most MPEG/ VOB → MKV conversions.
Maybe you would like to add this patch to your sources and your spec file too. That would be nice.
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