[FFmpeg-user] Read mp4 video from pipe

[Cley Faye]

2016-06-17 12:21 GMT+02:00 kolychev <kolychev at speechpro.com>:

> $ cat video.mp4 | ffmpeg -pix_fmt yuv420p -i pipe: -r 25 -f image2pipe
> -vcodec mjpeg -q:v 1 pipe: > result
>
> ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
>   built with gcc 5.3.0 (GCC)
>   configuration: --prefix=/usr --disable-debug --disable-static
> --disable-stripping --enable-avisynth --enable-avresample
> --enable-fontconfig --enable-gnutls --enable-gpl --enable-ladspa
> --enable-libass --enable-libbluray --enable-libdcadec --enable-libfreetype
> --enable-libfribidi --enable-libgsm --enable-libiec61883
> --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
> --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus
> --enable-libpulse --enable-libschroedinger --enable-libsoxr
> --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2
> --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
> --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf
> --enable-shared --enable-version3 --enable-x11grab
>   libavutil      55. 17.103 / 55. 17.103
>   libavcodec     57. 24.102 / 57. 24.102
>   libavformat    57. 25.100 / 57. 25.100
>   libavdevice    57.  0.101 / 57.  0.101
>   libavfilter     6. 31.100 /  6. 31.100
>   libavresample   3.  0.  0 /  3.  0.  0
>   libswscale      4.  0.100 /  4.  0.100
>   libswresample   2.  0.101 /  2.  0.101
>   libpostproc    54.  0.100 / 54.  0.100
> Option pixel_format not found.
>

​I think the error message is explicit enough here. You're trying to apply
the option pix_fmt to an input file. Simply remove it (or move it after
your inputs and before your output if required) and it should work (at
least here it does).