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

[Diaz Soho <soho123 2012 gmail com>]

Dear Jens,

After checking the pipe when I use pipe 2 to verification.

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 c code :gst-plugins-base-0.10.36/gst-libs/gst/audio/gstaudiosink.c, 

function audioringbuffer_thread_func(), 

the thread will read audio data from ring buffer, then write to audio sink.

I write the data  that read from ring buffer to local usb disk.

And check the file, it contents silence data after 1 second.

I have write the e-mail to the mail-list

thanks!

2013/12/5 Jens Georg <mail jensge org>

If it's breaking with pure gst-launch, the issue is out of scope of this mailinglist and rygel and probably better to discuss with the GStreamer people.

Could be anything...

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
[1] ! 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
[1] ! 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?

Links:
------
[1]
http://192.168.1.3:9000/disk/DLNA-PNAAC_ISO-OP01-FLAGS01700000/O0$1$8I2829.m4a