libav has a bug that libav detects wrong CTS from fragmented ISO base
media file formats.

This bug occurs, for instance, when there is a track that has some
samples with composition time offset and has a track run without
sample-composition-time-
offsets-present.
I attached a patch for this bug and an extreme sample.

Attachment: 0001-mov-fix-composition-timestamps-on-movie-fragments.patch
Description: Binary data

Attachment: movie_fragments_with_ct_offsets.mp4
Description: video/mp4

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