ffmpeg configure how to allow auto detection of codec without file types

ffmpeg can read png/bmp but can’t “auto detect them from unknown file type extension”

blank.pxxnxxgxx: Invalid data found when processing input

or with -f image2

Decoder (codec none) not found for input stream #0:0

meant add this to configure (after previously –disable-everything)

one of these fixed it:

–enable-demuxer=image2pipe –enable-demuxer=image_png_pipe –enable-demuxer=image_bmp_pipe –enable-demuxer=image_jpeg_pipe

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