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

[Sebastian Dröge]

On Mi, 2013-12-04 at 20:56 +0800, Diaz Soho wrote:
> Hi all,
> 
> 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?

The problem might be that decoding can't happen in realtime or there are
any other synchronization problems. You should see some hints if you
look at the GStreamer debug output.

-- 
Sebastian Dröge <sebastian at centricular.com>
Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
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