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View Compilation Error

0_0_28849028_16564.cpp:2:5: error: 'seek_pos' does not name a type
     seek_pos =10 *1000000;//计算到想偏移的时间，第10秒
     ^
0_0_28849028_16564.cpp:3:18: error: expected constructor, destructor, or type conversion before '(' token
     av_seek_frame(ifmt_ctx,-1,seek_pos,AVSEEK_FLAG_BACKWARD);//偏移到10秒这里
                  ^


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