audioresample does not works well with appsrc

[leeoxiang]

Hi, 

I am try to using audioresample to do a audio resample from 44100 to 48000, 
the audio is from rtmp stream.

```
gst-launch-1.0  uridecodebin
uri=rtmp://ali.wangxiao.eaydu.com/live_bak/x_100_rtc_test ! audioconvert !
audioresample ! audio/x-raw,rate=48000 ! autoaudiosink
```

it works fine.

then i use appsrc  with audioresample  


the works fine pipeline 

```
appsrc do-timestamp=true is-live=true name=audiosrc ! decodebin !
audioconvert  ! autoaudiosink
```


but this pipeline does not work,  it will have some noise 

```
appsrc do-timestamp=true is-live=true name=audiosrc ! decodebin !
audioconvert  ! audioresample !  audio/x-raw, rate=48000 ! autoaudiosink
```


It seems the problem happens  when use appsrc and audioresample,  am i doing
somehting wrong.





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