有几率报错
#2 0x000000010279beb8 in -[PLSQosCollector receiveDicWithString:] at Private-SDK/pili-short-video-kit/iOS/PLShortVideoKit/PLShortVideoKit/Qos/PLSQosCollector.m:144
Thread 37: Exception: "*** -[_NSPlaceholderData initWithBase64EncodedString:options:]: nil string argument"
