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-rw-r--r--libmpdemux/demux_rtp.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/libmpdemux/demux_rtp.cpp b/libmpdemux/demux_rtp.cpp
index 86c9ea641f..ca3429ea58 100644
--- a/libmpdemux/demux_rtp.cpp
+++ b/libmpdemux/demux_rtp.cpp
@@ -241,7 +241,7 @@ extern "C" void demux_open_rtp(demuxer_t* demuxer) {
wf->wBitsPerSample = 8;
wf->cbSize = 0;
} else if (strcmp(subsession->codecName(), "GSM") == 0) {
- wf->wFormatTag = sh_audio->format = 0x31;
+ wf->wFormatTag = sh_audio->format = mmioFOURCC('a','g','s','m');
wf->nChannels = 1;
wf->nAvgBytesPerSec = 1650;
wf->nBlockAlign = 33;