[FFmpeg-user] ocr howto set whitelist

[Paul B Mahol]

On 5/17/19, Thomas Seilund <tps at netmaster.dk> wrote:
> Hi all
>
> I run this command as webcam connected at /dev/video2 points a piece of
> paper with the text "123a".
>
> FFREPORT=file=ffreport.log:level=32 ffmpeg -y -loglevel debug -f v4l2
> -input_format mjpeg -s hd480 -r 30 -i /dev/video2 -filter_complex
> "[0:0]fps=1,ocr=language=eng:whitelist=0123456789,metadata=print:key=lavfi.ocr.text,null[X]"
> -map '[X]' -pix_fmt yuv420p -f xv Title
>
> Above I set whitelist to "0123456789" but still I see
> "[Parsed_metadata_2 @ 0x55fb2537b9c0] lavfi.ocr.text=123a" in log file
> ffreport.log
>
> Why is the letter "a" recognized when the letter "a" is not in the
> whitelist?

Probably because blacklist is empty.

>
> It is difficult to find ex. of ffmpeg with the ocr filter - any hints?
>
> Thanks in advance
>
> Thomas S
>
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