环境：python3.8 直接用demo：asr_json.py 修改

音频为mp3转为wav，转码参数： '-ar','16000','-ac','1','-acodec','pcm_s16le','-f','s16le'

文件大小 2.6M

wav时长约30秒

报错信息如下：
Request time cost 4.548259
{"err_msg":"content len too long.","err_no":3310,"sn":"417291272071587043490"}

ps:用demo的音源文件没有问题

Request time cost 1.309988
{"corpus_no":"6816304535446545399","err_msg":"success.","err_no":0,"result":["北京科技馆。"],"sn":"129074330671587044572"}

求助，如何解决？