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我正在做一个项目，我必须在 HEVC 编码的比特流中实现切片丢失并在解码后查看输出视频。我在解码的视频中看到一个奇怪的绿色补丁（使用 ffmpeg/UHDcode）代替丢失的切片。是不是某种隐瞒？我怎样才能删除那些绿色补丁？