[FFmpeg-trac] #3541(ffprobe:new): amr file use the last packet mode and size to calculate bit rate,

[FFmpeg]

#3541: amr file use the last packet mode and size to calculate bit rate,
---------------------------------+-----------------------------------
             Reporter:  queniao  |                    Owner:
                 Type:  defect   |                   Status:  new
             Priority:  normal   |                Component:  ffprobe
              Version:  2.1.4    |               Resolution:
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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Comment (by queniao):

 fix it by set bit rate only once
 FFmpeg/libavformat/amr.c View
  @@ -138,7 +138,8 @@ static int amr_read_packet(AVFormatContext *s,
 AVPacket *pkt)
           return AVERROR(EIO);

       /* Both AMR formats have 50 frames per second */
  -    s->streams[0]->codec->bit_rate = size*8*50;
  +    if ( s->streams[0]->codec->bit_rate == 0 )
  +          s->streams[0]->codec->bit_rate = size*8*50;

       pkt->stream_index = 0;
       pkt->pos          = pos;

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Ticket URL: <https://trac.ffmpeg.org/ticket/3541#comment:3>
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