Je cherche un codec

salut,
sa m'affiche se message et jai pas de son sur le fichier

Stream 1

Media Type 0:
--------------------------
AM_MEDIA_TYPE:
majortype: MEDIATYPE_Audio {73647561-0000-0010-8000-00AA00389B71}
subtype: Unknown GUID Name {0000676F-0000-0010-8000-00AA00389B71}
formattype: FORMAT_WaveFormatEx {05589F81-C356-11CE-BF01-00AA0055595A}
bFixedSizeSamples: 1
bTemporalCompression: 0
lSampleSize: 9270
cbFormat: 26

WAVEFORMATEX:
wFormatTag: 0x676f
nChannels: 1
nSamplesPerSec: 48000
nAvgBytesPerSec: 16000
nBlockAlign: 1
wBitsPerSample: 16
cbSize: 8 (extra bytes)

sur un autre fichier j'ai sa aussi pareil pas de son

Stream 1

Media Type 0:
--------------------------
AM_MEDIA_TYPE:
majortype: MEDIATYPE_Audio {73647561-0000-0010-8000-00AA00389B71}
subtype: Unknown GUID Name {0000676F-0000-0010-8000-00AA00389B71}
formattype: FORMAT_WaveFormatEx {05589F81-C356-11CE-BF01-00AA0055595A}
bFixedSizeSamples: 1
bTemporalCompression: 0
lSampleSize: 24000
cbFormat: 26

WAVEFORMATEX:
wFormatTag: 0x676f
nChannels: 2
nSamplesPerSec: 48000
nAvgBytesPerSec: 16000
nBlockAlign: 1
wBitsPerSample: 16
cbSize: 8 (extra bytes)