[FFmpeg-trac] #8107(undetermined:new): webp demux failure

[FFmpeg]

#8107: webp demux failure
-------------------------------------+-------------------------------------
             Reporter:  jzern        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 If a valid webp file contains extra data after the reported file (riff)
 size the demuxer will fail, see below. This can occur in some transcode
 pipeline if e.g., padding bytes from encryption are not stripped. libwebp
 tools handle the attached as they only parse through the reported riff
 size.

 How to reproduce:
 {{{
 % ./ffmpeg -y -i test.webp out.ppm
 ffmpeg version N-94694-g95780f4dcb Copyright (c) 2000-2019 the FFmpeg
 developers
 built with gcc 8 (Debian 8.2.0-14+build1)
 configuration: --enable-libwebp
 libavutil      56. 33.100 / 56. 33.100
 libavcodec     58. 56.100 / 58. 56.100
 libavformat    58. 31.104 / 58. 31.104
 libavdevice    58.  9.100 / 58.  9.100
 libavfilter     7. 58.101 /  7. 58.101
 libswscale      5.  6.100 /  5.  6.100
 libswresample   3.  6.100 /  3.  6.100
 Input #0, webp_pipe, from 'test.webp':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: webp, yuv420p(tv, bt470bg/unknown/unknown),
 128x128, 25 tbr, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (webp (native) -> ppm (native))
 Press [q] to stop, [?] for help
 [webp @ 0x55c25b430980] Multiple ff_thread_finish_setup() calls
 [webp @ 0x55c25b430980] A frame threaded decoder did not free the frame on
 failure. This is a bug, please report it.
 Assertion frame->buf[0] failed at src/libavcodec/decode.c:618

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8107>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker