[FFmpeg-user] FFMPEG Signature Error

Nicolas Briand nicolas.briand at ericsson.com
Tue Feb 20 13:04:45 EET 2018


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’

There is the full log in the attachment.

Best regards,


Briand Nicolas | Integration Engineer
+33 638831235
nicolas.briand at ericsson.com<mailto:nicolas.briand at ericsson.com>

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