[FFmpeg-trac] #4907(avcodec:new): Support decoding animated WebP images

FFmpeg trac at avcodec.org
Mon Oct 5 20:13:40 CEST 2015


#4907: Support decoding animated WebP images
---------------------------------+---------------------------------------
             Reporter:  urvang   |                     Type:  enhancement
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  unspecified
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+---------------------------------------
 Summary of the bug:
 Currently, FFmpeg can encode animated WebPs, but cannot decode them, which
 is inconvenient for users.

 Decoding animated WebPs right now generates "image data not found error"
 due to "unsupported chunk":
 https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/webp.c#L1504

 How to reproduce:
 (example input image: https://www.gstatic.com/webp/animated/1.webp)

 {{{
 % ffmpeg -i 1.webp 1.gif
 ffmpeg version N-75787-g1d4af04 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
   configuration: --enable-libwebp
   libavutil      55.  2.100 / 55.  2.100
   libavcodec     57.  4.100 / 57.  4.100
   libavformat    57.  3.100 / 57.  3.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 10.100 /  6. 10.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
 [webp @ 0x3782940] image data not found
 [webp_pipe @ 0x3781360] decoding for stream 0 failed

 < Rest of the output truncated >

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4907>
FFmpeg <https://ffmpeg.org>
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