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-rw-r--r--libavformat/riff.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/riff.c b/libavformat/riff.c
index ffa35566a9..0a2a77cb7c 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -364,7 +364,7 @@ int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
} else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
put_le16(pb, 2); /* wav_extra_size */
hdrsize += 2;
- put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
+ put_le16(pb, enc->frame_size); /* wSamplesPerBlock */
} else if(enc->extradata_size){
put_le16(pb, enc->extradata_size);
put_buffer(pb, enc->extradata, enc->extradata_size);