[FFmpeg-user] FFMPEG Signature Error

[Glenn Cooper]

I’ve literally just fixed this by changing the -cvs parameter from 1 to 31. CPU levels are perfect now, but thanks for looking over my problem 

> On 20 Feb 2018, at 5:23 pm, Dave Rice <dave at dericed.com> wrote:
> 
> Hi Nicolas,
> 
>> On Feb 20, 2018, at 6:04 AM, Nicolas Briand <nicolas.briand at ericsson.com> wrote:
>> 
>> Hi,
>> 
>> I was reading the FFMPEG manual and one function interest me. This function is called “Signature”.
>> 
>> I downloaded the last FFMPEG build static and I read the doc inside the .rar. There is two examples given, we have :
>> 
>> “To calculate the signature of an input video and store it in signature.bin:
>> ffmpeg -i input.mkv -vf signature=filename=signature.bin -map 0:v -f null -
>> To detect whether two videos match and store the signatures in XML format in signature0.xml and signature1.xml:
>> ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0:v][1:v] signature=nb_inputs=2:detectmode=full:format=xml:filename=signature%d.xml" -map :v -f null –“
>> 
>> The first one currently works, I took one .mp4 video, and I got a signature.xml.
>> 
>> But the second one doesn’t work. I would like to know if this is normal or a bug, if anyone has the answer.
>> 
>> This is the error generated :
>> ‘[Parsed_signature_0 @ 00000000004a31c0] The filename must contain %d or %0nd, if you have more than one input.
>> [AVFilterGraph @ 000000000273d340] Error initializing filter 'signature' with args 'nb_inputs=2:detectmode=full:format=xml:filename=signaturev -f nullÔÇôÔÇ£'
>> Error initializing complex filters.
>> Invalid argument’
> 
> Perhaps the issue is that you’re naming the output of the signature filter of the first command as "signature%d.xml” but then the input to the signature filter in the second command as “signaturev”.
> 
> For use of this filter I also recommend this blogpost: https://ndsr.americanarchive.org/2017/04/20/adventures-in-perceptual-hashing/ <https://ndsr.americanarchive.org/2017/04/20/adventures-in-perceptual-hashing/>
> 
> […]
> 
> Best Regards,
> Dave Rice
> 
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