amr file use the last packet mode and size to calculate bit rate,

[queniao]

Summary of the bug:
How to reproduce:

% ffprobe 111.amr -show_streams
ffmpeg 2.1

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[Carl Eugen Hoyos]

Is this not reproducible with ffmpeg (the application)?

Please test current git head and please provide the failing command line together with the complete, uncut console output to make this a valid ticket.

[queniao]

~/o/FFmpeg/FFmpeg-master$ ./ffprobe ~/raw/111.amr -show_streams
ffprobe version 2.2.git Copyright (c) 2007-2014 the FFmpeg developers

built on Apr 10 2014 10:15:28 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration: --disable-yasm
libavutil 52. 75.100 / 52. 75.100
libavcodec 55. 58.103 / 55. 58.103
libavformat 55. 36.103 / 55. 36.103
libavdevice 55. 11.100 / 55. 11.100
libavfilter 4. 3.100 / 4. 3.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 18.100 / 0. 18.100

[amr @ 0x1bb8240] Estimating duration from bitrate, this may be inaccurate
Input #0, amr, from '/home/qiniu/raw/111.amr':

Duration: 00:00:09.56, bitrate: 5 kb/s

Stream #0:0: Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 5 kb/s

[STREAM]
index=0
codec_name=amrnb
codec_long_name=AMR-NB (Adaptive Multi-Rate NarrowBand)
profile=unknown
codec_type=audio
codec_time_base=1/8000
codec_tag_string=samr
codec_tag=0x726d6173
sample_fmt=flt
sample_rate=8000
channels=1
channel_layout=mono
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/8000
start_pts=N/A
start_time=N/A
duration_ts=76480
duration=9.560000
bit_rate=5200
nb_frames=N/A
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=0
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
STREAM

[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;

[Carl Eugen Hoyos]

Is the problem not reproducible with ffmpeg -i 111.amr?

[Carl Eugen Hoyos]

Should be fixed in c43222f4 - thank you for the report!