没有声音，但有图像。提示信息如下：

媒体流 1

媒体类型 0:
--------------------------
AM_MEDIA_TYPE:
majortype: MEDIATYPE_Audio {73647561-0000-0010-8000-00AA00389B71}
subtype: Unknown GUID Name {00000161-0000-0010-8000-00AA00389B71}
formattype: FORMAT_WaveFormatEx {05589F81-C356-11CE-BF01-00AA0055595A}
bFixedSizeSamples: 1
bTemporalCompression: 0
lSampleSize: 120528
cbFormat: 28

WAVEFORMATEX:
wFormatTag: 0x0161
nChannels: 2
nSamplesPerSec: 44100
nAvgBytesPerSec: 8010
nBlockAlign: 372
wBitsPerSample: 16
cbSize: 10 (extra bytes)