[FFmpeg-user] ocr howto set whitelist

[Thomas Seilund]

On 17/05/2019 16.13, Paul B Mahol wrote:
> 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.

Thanks

New command but same behaviour:

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:blacklist=abc,metadata=print:key=lavfi.ocr.text,null[X]" 
-map '[X]' -pix_fmt yuv420p -f xv Title

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