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contrib: ffmpeg: fix decoding fragmented MP4 with multiple sample entries and empty stsc

Dimitry Andricrequested to merge
dimitry-unified/vlc:fix-decoding-fmp4-with-multiple-sample-entries into master

This applies the FFmpeg patch posted at https://ffmpeg.org/pipermail/ffmpeg-devel/2025-April/341860.html

This fixes fragmented MP4 files with AVC video and multiple sample entries, where changing sample description indexes are signaled in each fragment's tfhd box.

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VideoLAN code repository instance