视频压缩

Batch-compress videos in a user-selected directory to a user-specified target size and convert ALL input formats to MP4 output using FFmpeg (H.264/H.265). Use this skill whenever the user wants to compress one or more video files in a folder to a target file size (e.g. "8MB for Discord", "25MB for email", "100MB for large file sharing") and obtain MP4 outputs. The skill reads each video's duration, codec and bitrate, computes a fitting video bitrate, re-encodes incompatible streams (VP9/Opus/etc.) to H.264/AAC so any source format (MKV/WebM/AVI/FLV/WMV/MOV/TS/MTS/M2TS/3GP/VOB/OGV/RM/RMVB...) reliably becomes MP4, and writes `<name>_压缩版.mp4` next to the source. Triggers: "压缩视频", "批量压缩", "压缩到 X MB", "转成 MP4", "视频转 MP4", "compress videos to 25MB", "convert to mp4", "batch video compressor", "reduce video size".

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