Hello all!
     when I play  a mp3 file and do seektotime near to the end , I control to play the other mp3 file immediately.As a 
result ,it tips the errror: Couldn't create prefetch mutex. 16.  
     IN the config file of io-media-generic.cfg, I config all the prefetch value =2.
the error log is as follow,please give me some advices,thanks!


io-media-generic/aoi: Fraunhofer MP3 Decoder:->got a flush.
io-media-generic/mmf: Couldn't lock mutex, prefetch event lost.
io-media-generic/aoi: Fraunhofer MP3 Decoder:->got a flush.
io-media-generic/mmf: Couldn't lock mutex, prefetch event lost.
io-media-generic/trackplayer: Skipping video subgraph because there is no video device specified.
io-media-generic/mmf: Configuring the queue for -1 bytes, lw = 0, hw = 0.
io-media-generic/aoi: mpega_parser->ParseID3v2_3or4 couldn't parse the Comment field
io-media-generic/trackplayer: Skipping video subgraph because there is no device specified.
io-media-generic/mmf: Configuring the queue for 241500 bytes, lw = 48300, hw = 193200.
io-media-generic/trackplayer: Couldn't load the xing_mpega_decoder filter (based on the decoder tag), mmerr=4046
io-media-generic/mmf: Configuring the queue for 176400 bytes, lw = 17640, hw = 158760.
io-media-generic/aoi: Fraunhofer MP3 Decoder:->QueryOutputFormats 'AWAR', 44100x16 (1 x 304128bytes)
io-media-generic/aoi: audio_writer using output device: '/dev/snd/pcmPreferredp'
io-media-generic/aoi: audio_writer asking for Signed 16-bit Little Endian, 1..2x17640B frags, 44100Hz, bps=4, 2ch
io-media-generic/aoi: audio_writer settings:  Signed 16-bit Little Endian, 3x4096B frags, 44100Hz, bps=4, 2ch, Q time 
69ms
io-media-generic/aoi: audio_writer PGA_StreamerCreate() adjusting chunk_size from 17640bytes to 20480bytes
io-media-generic/aoi: audio_writer using mixer device '/dev/snd/mixerC0D0'
io-media-generic/aoi: AudioWriterTask() adjusting chunk_size from 20480bytes to 20480bytes
io-media-generic/aoi: Fraunhofer MP3 Decoder:->SetOutputFormat 'AWAR', 44100x16bits
io-media-generic/trackplayer: Skipping subgraph 1 because there is no device specified.
io-media-generic/mmf: Couldn't create prefetch mutex. 16
io-media-generic/trackplayer: Couldn't set up prefetching