[FFmpeg-devel] avcodec_open2 return -1

[sea]

In transcoding project of LeiXiaoHua(demo of usage of filters), if I use media 
file with h264 video stream as input file, the function  avcodec_open2 will 
return -1.  Media file with video stream in other format, such as mpeg4, mjpeg 
return 0 (OK). Why ? Someone meets the same problem?
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