[FFmpeg-user] Reading bwf metaedit md5 value with ffprobe

[Stuart Robinson]

> From what I understand you could achieve the same effect (MD5 checksum of the data part only) using a command-line like:
>
> ffmpeg -i INPUT.wav -f md5 -c copy - 2>NUL
>

The checksums don't match when I use this method so I can't use it to compare.




--

Thanks,

        Stuart Robinson,

        AV Technician,

        Sound Lab,

        School of Scottish Studies,

        University of Edinburgh,

        29 George Square,

        Edinburgh,

        EH8 9LD



        0131 651 5001





The University of Edinburgh is a charitable body, registered in

Scotland, with registration number SC005336.


________________________________
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> on behalf of Bouke / Videotoolshed <bouke at videotoolshed.com>
Sent: 03 August 2023 08:51
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] Reading bwf metaedit md5 value with ffprobe

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> On 3 Aug 2023, at 09:20, Tobias Rapp <t.rapp at noa-archive.com> wrote:
>
> On 02/08/2023 17:43, Stuart Robinson wrote:
>> I think Wavelab (since at least 8.5 and up to the current version) can also read and write that chunk so it must be standardised in some way.
>>
>> I t would be useful to be able to do be able to read and write this tag, is it possible to make a feature request?
>>
>> It seems to just tack on some data to the end of the file.
>>
>> <?xpacket end="w"?>MD5    ÇúR
§üªû õ
°
%vþ
>>
>> Thanks, Stuart
>>
> From what I understand you could achieve the same effect (MD5 checksum of the data part only) using a command-line like:
>
> ffmpeg -i INPUT.wav -f md5 -c copy - 2>NUL
>
> But then you have to store the checksum output somewhere, either in a sidecar file or a database. My recommendation would be to do it like this and store the checksum of the whole file. That way it will work with any kind of file in your processing chain - AVI, PDF, WAV, Matroska, etc

My question, how is an application capable of storing a checksum inside a file it’s describing? Adding it will change the checksum…

Bouke



> Regards, Tobias
>
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