ffmpeg - 尝试从 webp 转换为 mp4 时找不到图像数据

Question

更新:

尝试了 Neckbeard 推荐的命令:

ffmpeg -analyzeduration 10M -probesize 10M -i Webpfile.webp -c:v libx264 output.mp4

这是输出(概括的文件路径):

User-macbookpro:~ User$ ffmpeg -analyzeduration 10M -probesize 10M -i Webpfile.webp -c:v libx264 output.mp4
ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.38)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopenh264 --enable-libopus --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3 --enable-nonfree
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[webp @ 0x7f9920811000] skipping unsupported chunk: ANIM
[webp @ 0x7f9920811000] skipping unsupported chunk: ANMF
    Last message repeated 14 times
[webp @ 0x7f9920811000] image data not found
[webp_pipe @ 0x7f9920000e00] decoding for stream 0 failed
[webp_pipe @ 0x7f9920000e00] Could not find codec parameters for stream 0 (Video: webp, none): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, webp_pipe, from 'webpfile.webp':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: webp, none, 25 tbr, 25 tbn, 25 tbc
File 'output.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (webp (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[webp @ 0x7f9920005e00] skipping unsupported chunk: ANIM
[webp @ 0x7f9920005e00] skipping unsupported chunk: ANMF
    Last message repeated 14 times
[webp @ 0x7f9920005e00] image data not found
Error while decoding stream #0:0: Invalid data found when processing input
Finishing stream 0:0 without any data written to it.
Nothing was written into output file 0 (output.mp4), because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
Conversion failed!

目前我正在尝试将 webp 转换回 mp4，但出现错误:
Nothing was written into output file 0 (output.mp4), because at least one of its streams received no packets.
这是我一直在使用但没有成功的当前命令:

ffmpeg -i webpfile.webp -c:v libx264 output.mp4

我注意到在处理过程中还有其他错误，调用
Skipping unsupported chunk: ANIM Skipping unsupported chunk: ANMF
和

Could not find codec parameters for stream 0 (Video: webp, none): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options

我在这里做错了什么？我认为这就像我将电影转换为 webp 一样简单，但换一种方式似乎更微妙。

Answer 1

根据这张 FFmpeg 票证，尚不支持解码动画 webp 文件。

https://trac.ffmpeg.org/ticket/4907

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

当前工单状态: 开放增强