No sound after 1 second after AAC decode to usb sound card, but output to file seems OK

[Diaz Soho <soho123 2012 gmail com>]

Hi all,

My my target platform is CPU is 400MHz, system memory is 32MB, CPU is lexra (MIPS like).

the media Info of audio file is :

431Kbps, 44.1Khz, 2 channel, AAC(LC)

originally , I play AAC file by Rygel DLNA protocol. No sound after 1 second after AAC decode.

In advance I try to use the pipe below to verify,

the pipe I used for verification:

1. gst-launch-0.10 -v http://192.168.1.3:9000/disk/DLNA-PNAAC_ISO-OP01-FLAGS01700000/O0$1$8I2829.m4a ! qtdemux ! ffdec_aac ! audioconvert ! audio/x-raw-int,width=16 ! filesink location=/var/tmp/usb/sda1/aac_test.pcm

2. gst-launch-0.10 -v http://192.168.1.3:9000/disk/DLNA-PNAAC_ISO-OP01-FLAGS01700000/O0$1$8I2829.m4a ! qtdemux ! ffdec_aac ! audioconvert ! audio/x-raw-int,width=16 ! alsasink

In the pipe 1 , the output file /var/tmp/usb/sda1/aac_test.pcm can be played normally.

In the pipe 2, the output from usb sound card can not be hear normally after about 1 seconds.

Does anyone have any idea about the issue?