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鉴于在进行 NVENC 调用时需要跨线程同步 cuda 上下文，使用多个线程编码多个流时是否存在真正的并发性 [每个线程处理单个流]？
我们在一个线程中做所有事情不是更好吗——节省互斥锁的系统调用等？