Início / computer / Perguntas / 1554151
Accepted
Zombo
Asked: 2020-05-23 06:02:11 +0800 CST

Decodificar WebP com FFmpeg

  • 772

Eu gostaria de converter este arquivo:

https://gstatic.com/webp/gallery/1.sm.webp

Para PNG ou JPG com FFmpeg. Eu tentei isso:

ffmpeg -i 1.sm.webp a.png

mas e erro foi produzido:

ffmpeg version git-2020-05-22-38490cb Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3.1 (GCC) 20200513
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
--enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
--enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp
--enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom
--disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm
--enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2
--enable-avisynth --enable-libopenmpt --enable-amf
libavutil      56. 46.100 / 56. 46.100
libavcodec     58. 86.101 / 58. 86.101
libavformat    58. 43.100 / 58. 43.100
libavdevice    58.  9.103 / 58.  9.103
libavfilter     7. 82.100 /  7. 82.100
libswscale      5.  6.101 /  5.  6.101
libswresample   3.  6.100 /  3.  6.100
libpostproc    55.  6.100 / 55.  6.100
[webp @ 00000000005750c0] missing RIFF tag
[image2 @ 0000000000562540] decoding for stream 0 failed
[image2 @ 0000000000562540] 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, image2, from '1.sm.webp':
Duration: 00:00:00.04, start: 0.000000, bitrate: 48 kb/s
Stream #0:0: Video: webp, none, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (webp (native) -> png (native))
Press [q] to stop, [?] for help
[webp @ 0000000000577fc0] missing RIFF tag
Error while decoding stream #0:0: Invalid data found when processing input
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed!

Eu tentei isso também:

ffmpeg -probesize 1000 -i 1.sm.webp a.png

mas o arquivo tem apenas 243 bytes e o erro permanece. Eu também tentei JPG. Estou fazendo algo errado? Eu sei que este arquivo pode ser convertido, porque eu fiz isso anteriormente com um programa Go:

https://github.com/muv1/cove/tree/cb640c66/webp-to-png

ffmpeg jpeg

2 respostas

  1. Best Answer

    Eu primeiro peguei o arquivo assim:

    curl -O https://gstatic.com/webp/gallery/1.sm.webp

    mas isso não é válido:

    $ curl https://gstatic.com/webp/gallery/1.sm.webp
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="https://www.gstatic.com/webp/gallery/1.sm.webp">here</A>.
</BODY></HTML>

    Deve ser um destes:

    curl -O https://www.gstatic.com/webp/gallery/1.sm.webp
curl -L -O https://gstatic.com/webp/gallery/1.sm.webp
    • 0

  2. Veja: https://trac.ffmpeg.org/ticket/4907 Ainda não parece que webm para png (etc) é suportado: "Resumo do bug: Atualmente, o FFmpeg pode codificar WebPs animados?, mas não pode decodificá-los, o que é inconveniente para os usuários."

    • 0

relate perguntas