Gstreamer dropping samples and voice cracking when using g722

[Jan Schmidt]

On 02/02/15 21:05, able.eldhose wrote:
> I am trying to create a g722 based audio streaming application.
>
> For that i tried the below pipeline which samples from mic, encode it ,
> decode it and output to the headphone
>
>      gst-launch-0.10 -v alsasrc ! 'audio/x-raw-int,channels=1,rate=16000' !
> ffenc_g722 ! ffdec_g722 ! alsasink
>
> When i run this in my PC it work perfect, but when i use this in a embedded
> linux board, voice is cracking heavily and cant hear anything useful.
>
> Iam using a zedboard based on zynq-7000.
>
> Debug prints shows like below
>
>      Additional debug info:
>      gstbaseaudiosrc.c(840): gst_base_audio_src_create ():
> /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0:
>      Dropped 3200 samples. This is most likely because downstream can't keep
> up and is consuming samples too slowly.
>      WARNING: from element /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: Can't
> record audio fast enough
>
> When i removed g722 from the pipeline it works well on the board with good
> sound clarity.

Are you still using the capsfilter when testing without g722? I want to 
make sure you're not seeing CPU consumption from ALSA resampling to give 
you 16khz.

You may try inserting a queue between ffenc_g722 and ffdec_g722 to 
decouple the encoding and decoding.

Regards,
Jan.

> My basic requirement was to stream audio to a multicast IP group using
> gstreamer and g722 encoding. Any hint for correcting this issue will be very
> helpfull...
>
>
>
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