avformat_open_input -13
上面这个错误，很可能是你权限没有打开哦，权限不足引起的，这个可不能大意。
如 http://stackoverflow.com/questions/21549829/ffmpeg-avformat-open-input-returned-error 中的解释，－13是权限相关的错误，于是在AndroidManifest.xml中加入以下权限即可：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
AVERROR_BSF_NOT_FOUND = -1179861752
AVERROR_BUG = -558323010
AVERROR_DECODER_NOT_FOUND = -1128613112
AVERROR_DEMUXER_NOT_FOUND = -1296385272
AVERROR_ENCODER_NOT_FOUND = -1129203192
AVERROR_EOF = -541478725
AVERROR_EXIT = -1414092869
AVERROR_FILTER_NOT_FOUND = -1279870712
AVERROR_INVALIDDATA = -1094995529
AVERROR_MUXER_NOT_FOUND = -1481985528
AVERROR_OPTION_NOT_FOUND = -1414549496
AVERROR_PATCHWELCOME = -1163346256
AVERROR_PROTOCOL_NOT_FOUND = -1330794744
AVERROR_STREAM_NOT_FOUND = -1381258232
AVERROR_BUG2 = -541545794
AVERROR_UNKNOWN = -1313558101