I did some more tests:
When i create the subtitles within the track editor of scenarist, i can mux more than 24 Subtitle streams on the same video track i tried it before.
That doesnt help much, because it would take years to create all the subtitles manually, but i think it shows that the problem must have something to do with the subtitle script that i import or the tif-files that my customer delivered to me.
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