[FFmpeg-trac] #8540(avformat:new): wavdec failure when wav contains id3 tag with image

[FFmpeg]

#8540: wavdec failure when wav contains id3 tag with image
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             Reporter:  Adion     |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:  wav id3   |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 The wav format decoder has a hard-coded assumption that there is 1 audio
 stream at index 0 and optionally one video stream at index 1.

 When wav_read_header encounters an ID3 tag, it will call
 ff_id3v2_parse_apic which creates a new stream for the attached picture.
 If the ID3 tag comes before the fmt tag, the audio tag will therefore end
 up at index 1 instead of index 0.

 wav_read_packet on the other hand will mark all packets as belonging to
 index 0, thus you may end up never finding a packet to feed to the audio
 codec.

 The easiest fix is probably to re-order the streams in read_header to
 ensure the assumptions hold up.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8540>
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