[FFmpeg-devel] [PATCH] avformat/img2dec: Option to play sequence backwards

[Sergio Acereda]

Yes, I tried, but this only works if your sequence has the '-' before the numeric elements. You can see they comment that in the thread, by saying you have to remove the '-' from the expression.

$ ffmpeg -v debug -start_number -24 -i Comentaris_prova_%05d.png out.mkv
ffmpeg version 2020-10-17-git-62073cfa97-essentials_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
 libavutil      56. 60.100 / 56. 60.100
 libavcodec     58.111.101 / 58.111.101
 libavformat    58. 62.100 / 58. 62.100
 libavdevice    58. 11.102 / 58. 11.102
 libavfilter     7. 87.100 /  7. 87.100
 libswscale      5.  8.100 /  5.  8.100
 libswresample   3.  8.100 /  3.  8.100
 libpostproc    55.  8.100 / 55.  8.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with argument 'debug'.
Reading option '-start_number' ... matched as AVOption 'start_number' with argument '-24'.
Reading option '-i' ... matched as input url with argument 'Comentaris_prova_%05d.png'.
Reading option 'out.mkv' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url Comentaris_prova_%05d.png.
Successfully parsed a group of options.
Opening an input file: Comentaris_prova_%05d.png.
[image2 @ 000001742817d100] Could find no file with path 'Comentaris_prova_%05d.png' and index in the range -24--20
Comentaris_prova_%05d.png: No such file or directory