I also selected to convert to other formats and resolutions like 4K, and the results were satifying. The libavformat library provides some generic global options, which can be set on all the muxers and demuxers. If your streams are not tightly interleaved you may not get all the packets from all streams before Out point and you may only will be able to decode the earliest stream until Out point. As a small aside, shortly after this feature was merged, users reported severe performance issues in a few select games, including Harry Potter and the Prisoner of Azkaban and F1 Input Tab: No problems found.
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