ijk在播放搜狐视频时，前5分钟可以拖动，后5分钟不能拖动

这是播放地址:http://hot.vrs.sohu.com/ipad1278315_4710392728256_4489636.m3u8?plat=3&uid=0c45bff8-05ea-46aa-9876-28e9c7f538da&pt=3&prod=mdk&pg=1&qd=130015&cv=1.5&file_length=371005149;
拖动时长超过5分钟就会卡住，然后走播放器完成的回调。

No source file or test is named. Start by reproducing the reported seek behavior with the provided Sohu M3U8 URL and trace the playback seek path and completion callback; done means seeking beyond five minutes no longer stalls or invokes the completion callback.

Written by the indexing model from the issue text.