[FFmpeg-trac] #4723(avformat:new): reading WAV file fails due to misdetection as MP1 stream

[FFmpeg]

#4723: reading WAV file fails due to misdetection as MP1 stream
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             Reporter:  pneuman   |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 When trying to open a particular WAV file (which was previously converted
 from a FLAC file using the "flac" tool), FFMPEG appears to misdetect the
 WAV's content as an MP1 stream, leading to errors that prevent FFMPEG from
 reading the file. This happens with a built from git-master:
 {{{
 lsd at pinchy:~/projects/ffmpeg/ffmpeg$ ./ffmpeg -i ../blah-snippet.wav
 -acodec alac -f ipod -y foo.m4a
 ffmpeg version N-73646-gc9c7263 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.9.3 (Debian 4.9.3-1)
   configuration:
   libavutil      54. 28.100 / 54. 28.100
   libavcodec     56. 48.100 / 56. 48.100
   libavformat    56. 40.100 / 56. 40.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 21.100 /  5. 21.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
 Input #0, wav, from '../blah-snippet.wav':
   Duration: 00:00:05.00, bitrate: 1411 kb/s
     Stream #0:0: Audio: mp1 ([1][0][0][0] / 0x0001), 44100 Hz, stereo,
 s16p, 1411 kb/s
 Output #0, ipod, to 'foo.m4a':
   Metadata:
     encoder         : Lavf56.40.100
     Stream #0:0: Audio: alac (alac / 0x63616C61), 44100 Hz, stereo, s16p,
 128 kb/s
     Metadata:
       encoder         : Lavc56.48.100 alac
 Stream mapping:
   Stream #0:0 -> #0:0 (mp1 (native) -> alac (native))
 Press [q] to stop, [?] for help
 Multiple frames in a packet from stream 0
 [output stream 0:0 @ 0x34d3ea0] 100 buffers queued in output stream 0:0,
 something may be wrong.
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [ipod @ 0x34d2d20] Non-monotonous DTS in output stream 0:0; previous:
 471014, current: 1280; changing to 471015. This may result in incorrect
 timestamps in the output file.
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 [mp1 @ 0x34d2860] Header missing
 Error while decoding stream #0:0: Invalid data found when processing input
 ...
 more of the same errors follow
 }}}
 A snippet of the file is attached.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4723>
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