different audio stream sample size

[Борис]

Hi. I want to stream audio data from microphone and from some ogg audio
file to my app.
There are pipelines:

from microphone:

directsoundsrc device=\"{1b70206d-3bb5-4246-a4b3-6aeddb8f1264}\"

! audioconvert

! audio/x-raw, format=(string)F32LE, rate=(int)48000, channels=(int)2,
layout=(string)interleaved

! appsink name=flowsink sync=true


from file:


filesrc location=sound_file.ogg ! oggdemux ! vorbisdec !

audioconvert ! audio/x-raw, format=(string)F32LE, channels=(int)2,
layout=(string)interleaved !

audioresample ! audio/x-raw, format=(string)F32LE, rate=(int)48000,
channels=(int)2, layout=(string)interleaved !

appsink name=flowsink sync=true


That's how i read buffer from stream:


	GstSample* gs = gst_app_sink_pull_sample(GST_APP_SINK( m_appsink));
        if (gs)
        {
            GstBuffer* gb = gst_sample_get_buffer(gs);  // no lifetime transfer
            GstMapInfo gm;
            if (!gb)
            {
               return false;
            }
            if (!gst_buffer_map(gb, &gm, GST_MAP_READ))
            {
               return false;
            }
            else
            {
                std::cout << "buffer size " << gm.size;
	    }

          }

when i read buffer from microphone stream everything works as expected
and i get

100 buffers per second with size 3840 (3840 / 2 / 4 = 48000 kHz)

but when i read from .ogg file i have strange buffer size which is
usually 2048 and sometimes less

and 200 buffers per second

Why does it work like that?
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