It sounds like you’re looking for a , a software tool , or a codec/preset related to the file big_buck_bunny.mkv (the common open-source test video).
ffmpeg -i big_buck_bunny.mkv -c:v libx264 -c:a aac output.mp4 (scene/clip) from the file To cut a 30-second piece starting at 1 minute: big buck bunny mkv
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