it is not necessary.
---
 libavformat/amr.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/libavformat/amr.c b/libavformat/amr.c
index 708eace..9dd8471 100644
--- a/libavformat/amr.c
+++ b/libavformat/amr.c
@@ -100,14 +100,12 @@ static int amr_read_header(AVFormatContext *s)
         st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b');
         st->codec->codec_id = CODEC_ID_AMR_WB;
         st->codec->sample_rate = 16000;
-        st->codec->frame_size = 320;
     }
     else
     {
         st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r');
         st->codec->codec_id = CODEC_ID_AMR_NB;
         st->codec->sample_rate = 8000;
-        st->codec->frame_size = 160;
     }
     st->codec->channels = 1;
     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
-- 
1.7.1

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