Hello, FFMPEG folks:
I have two simple GIF images, and I want to combine them into a 2-frame
animated GIF. This is to give me a reduced input file to diagnose
another FFMpeg issue.
However, when I do the obvious command, I get an error, "Decoder (codec
none) not found for input stream #0:0".
How can I make a simple 2-frame animate GIF out of my two still GIF
images blue_1.gif and blue_2.gif?
% ls -lF blue_[0-9].gif
-rw-r--r-- 1 myuser staff 1303 6 Jan 21:04 blue_1.gif
-rw-r--r-- 1 myuser staff 1379 6 Jan 21:05 blue_2.gif
% ffmpeg -f image2 -i blue_%d.gif -y animated_blue_12.gif
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample
--enable-libmp3lame --enable-libvorbis --enable-libopus --enable-librsvg
--enable-libtheora
--enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libsoxr
--enable-libspeex
--enable-libass --enable-libbluray --enable-lzma --enable-gnutls
--enable-fontconfig --enable-libfreetype
--enable-libfribidi --disable-indev=jack --enable-opencl --disable-outdev=xv
--enable-audiotoolbox
--enable-videotoolbox --enable-sdl2 --mandir=/opt/local/share/man
--enable-shared --enable-pthreads
--cc=/usr/bin/clang --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl
--enable-postproc
--enable-libx264 --enable-libxvid
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
[image2 @ 0x7ff99080ba00] Could not find codec parameters for stream 0 (Video:
none, none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, image2, from 'blue_%d.gif':
Duration: 00:00:00.08, start: 0.000000, bitrate: N/A
Stream #0:0: Video: none, none, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (? (?) -> gif (native))
Decoder (codec none) not found for input stream #0:0
How can I get past this problem? Maybe specify the image format, but how?
The documentation for the image2 format demuxer[1] does not appear to
say how the image2 demuxer identifies the image file formats that it
reads. Still, the extension is .gif, which I expect would be enough of a
hint.
The error message mentions the 'analyzeduration' options (default value
5,000,000 microseconds) and 'probesize' options (default value 5000000
bytes). Both these values are quite large for single-frame 1300-byte
GIFs. But setting them to small values doesn't change anything:
% ffmpeg -f image2 -analyzeduration 0 -probesize 1000 -i blue_%d.gif -y
animated_blue_12.gif
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus
--enable-librsvg --enable-libtheora --enable-libopenjpeg --enable-libmodplug
--enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass
--enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig
--enable-libfreetype --enable-libfribidi --disable-indev=jack --enable-opencl
--disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox --enable-sdl2
--mandir=/opt/local/share/man --enable-shared --enable-pthreads
--cc=/usr/bin/clang --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl
--enable-postproc --enable-libx264 --enable-libxvid
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
[image2 @ 0x7f9c5580a600] Could not find codec parameters for stream 0 (Video:
none, none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, image2, from 'blue_%d.gif':
Duration: 00:00:00.08, start: 0.000000, bitrate: N/A
Stream #0:0: Video: none, none, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (? (?) -> gif (native))
Decoder (codec none) not found for input stream #0:0
Again, how can I make a simple 2-frame animated GIF out of my two still
GIF images blue_1.gif and blue_2.gif?
[1] http://ffmpeg.org/ffmpeg-all.html#image2-1
Thanks in advance for your help. Best regards,
—Jim DeLaHunt
--
--Jim DeLaHunt, [email protected] http://blog.jdlh.com/ (http://jdlh.com/)
multilingual websites consultant
355-1027 Davie St, Vancouver BC V6E 4L2, Canada
Canada mobile +1-604-376-8953
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