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Audio MD5 Checksum with ffmpeg

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0

1

I'm getting these results under Windows (ffmpeg version N-78636-g45d3af9)

ffmpeg.exe -i TEST.mp3 -c:a copy -f md5 -

MD5=cb017003b355c2b39d71e8020bd76f5b



ffmpeg.exe -i TEST.mp3 -f md5 -

MD5=7bbe06733ddc930c8a120bced0f3fad9

Why is it different? And what is the proper way to calculate MD5 checksum for audio data only? How do I make ffmpeg return the string (MD5=xxxxx.xxxxx) only?

windows command-line audio ffmpeg mp3

share|improve this question

edited Feb 23 '16 at 12:24

slhck

161k47447470

asked Feb 23 '16 at 11:51

Data-BaseData-Base

1832513

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Next time asking about ffmpeg, please include the full, uncut command line output.
  
  – slhck
  Feb 23 '16 at 12:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  just thought it's easy to understand when I cut it! but nex time I will for sure ... Thanks
  
  – Data-Base
  Feb 23 '16 at 12:23
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Sure thanks. Sometimes it's not necessary, but it helps us catch minor errors or give explanations better suited to the question.
  
  – slhck
  Feb 23 '16 at 12:23
  

  
  
  
  

add a comment | 

0

1

I'm getting these results under Windows (ffmpeg version N-78636-g45d3af9)

ffmpeg.exe -i TEST.mp3 -c:a copy -f md5 -

MD5=cb017003b355c2b39d71e8020bd76f5b



ffmpeg.exe -i TEST.mp3 -f md5 -

MD5=7bbe06733ddc930c8a120bced0f3fad9

Why is it different? And what is the proper way to calculate MD5 checksum for audio data only? How do I make ffmpeg return the string (MD5=xxxxx.xxxxx) only?

windows command-line audio ffmpeg mp3

share|improve this question

edited Feb 23 '16 at 12:24

slhck

161k47447470

asked Feb 23 '16 at 11:51

Data-BaseData-Base

1832513

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Next time asking about ffmpeg, please include the full, uncut command line output.
  
  – slhck
  Feb 23 '16 at 12:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  just thought it's easy to understand when I cut it! but nex time I will for sure ... Thanks
  
  – Data-Base
  Feb 23 '16 at 12:23
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Sure thanks. Sometimes it's not necessary, but it helps us catch minor errors or give explanations better suited to the question.
  
  – slhck
  Feb 23 '16 at 12:23
  

  
  
  
  

add a comment | 

I'm getting these results under Windows (ffmpeg version N-78636-g45d3af9)

ffmpeg.exe -i TEST.mp3 -c:a copy -f md5 -

MD5=cb017003b355c2b39d71e8020bd76f5b



ffmpeg.exe -i TEST.mp3 -f md5 -

MD5=7bbe06733ddc930c8a120bced0f3fad9

Why is it different? And what is the proper way to calculate MD5 checksum for audio data only? How do I make ffmpeg return the string (MD5=xxxxx.xxxxx) only?

windows command-line audio ffmpeg mp3

share|improve this question

edited Feb 23 '16 at 12:24

slhck

161k47447470

asked Feb 23 '16 at 11:51

Data-BaseData-Base

1832513

ffmpeg.exe -i TEST.mp3 -c:a copy -f md5 -

MD5=cb017003b355c2b39d71e8020bd76f5b



ffmpeg.exe -i TEST.mp3 -f md5 -

MD5=7bbe06733ddc930c8a120bced0f3fad9

share|improve this question

edited Feb 23 '16 at 12:24

slhck

161k47447470

asked Feb 23 '16 at 11:51

Data-BaseData-Base

1832513

share|improve this question

edited Feb 23 '16 at 12:24

slhck

161k47447470

asked Feb 23 '16 at 11:51

Data-BaseData-Base

1832513

edited Feb 23 '16 at 12:24

slhck

161k47447470

edited Feb 23 '16 at 12:24

slhck

161k47447470

asked Feb 23 '16 at 11:51

Data-BaseData-Base

1832513

asked Feb 23 '16 at 11:51

Data-BaseData-Base

1832513

1 Answer
1

active

oldest

votes

2

If you read the documentation for the MD5 muxer, it says:

By default audio frames are converted to signed 16-bit raw audio and video frames to raw video before computing the hash.

So, in your second command (without specifying any codec option), this'd be the equivalent of -c:a pcm_s16le, while in your first example, you keep the MP3 audio bitstream. That's why they have different checksums.

The proper way would probably be to disable video streams (if the MP3 file contains artwork, for example) using -vn:

ffmpeg.exe -i TEST.mp3 -vn -f md5 -

You can disable the other output by redirecting stderr:

ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL

On Linux, use /dev/null instead of NUL.

share|improve this answer

edited Feb 23 '16 at 12:22

answered Feb 23 '16 at 12:12

slhckslhck

161k47447470

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  now I get this MD5=6e08f3bb7e5e8cc27e2f77a7817abbba a bit more confused ... but I will change the file tags and see how it will be :)
  
  – Data-Base
  Feb 23 '16 at 12:24
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If the MP3 contains artwork, it'll be rendered as a video stream and used in the MD5 calculation unless you disable it with -vn. If you show the complete ffmpeg output in your question, we can have a better look at it.
  
  – slhck
  Feb 23 '16 at 12:25
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  after deleting all tags from file: ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL MD5=6e08f3bb7e5e8cc27e2f77a7817abbba ffmpeg.exe -i TEST.mp3 -f md5 - 2>NUL MD5=6e08f3bb7e5e8cc27e2f77a7817abbba ffmpeg.exe -i TEST.mp3 -c:a copy -f md5 - 2> MD5=886d08f4e9c5450ee12796b006307a33
  
  – Data-Base
  Feb 23 '16 at 12:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That makes sense now. (I was asking about the full output, without the redirection, to see what kind of tags there were, but you seem to have resolved the problem.)
  
  – slhck
  Feb 23 '16 at 13:41
  

  
  
  
  

add a comment | 

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2

If you read the documentation for the MD5 muxer, it says:

By default audio frames are converted to signed 16-bit raw audio and video frames to raw video before computing the hash.

So, in your second command (without specifying any codec option), this'd be the equivalent of -c:a pcm_s16le, while in your first example, you keep the MP3 audio bitstream. That's why they have different checksums.

The proper way would probably be to disable video streams (if the MP3 file contains artwork, for example) using -vn:

ffmpeg.exe -i TEST.mp3 -vn -f md5 -

You can disable the other output by redirecting stderr:

ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL

On Linux, use /dev/null instead of NUL.

share|improve this answer

edited Feb 23 '16 at 12:22

answered Feb 23 '16 at 12:12

slhckslhck

161k47447470

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  now I get this MD5=6e08f3bb7e5e8cc27e2f77a7817abbba a bit more confused ... but I will change the file tags and see how it will be :)
  
  – Data-Base
  Feb 23 '16 at 12:24
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If the MP3 contains artwork, it'll be rendered as a video stream and used in the MD5 calculation unless you disable it with -vn. If you show the complete ffmpeg output in your question, we can have a better look at it.
  
  – slhck
  Feb 23 '16 at 12:25
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  after deleting all tags from file: ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL MD5=6e08f3bb7e5e8cc27e2f77a7817abbba ffmpeg.exe -i TEST.mp3 -f md5 - 2>NUL MD5=6e08f3bb7e5e8cc27e2f77a7817abbba ffmpeg.exe -i TEST.mp3 -c:a copy -f md5 - 2> MD5=886d08f4e9c5450ee12796b006307a33
  
  – Data-Base
  Feb 23 '16 at 12:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That makes sense now. (I was asking about the full output, without the redirection, to see what kind of tags there were, but you seem to have resolved the problem.)
  
  – slhck
  Feb 23 '16 at 13:41
  

  
  
  
  

add a comment | 

2

If you read the documentation for the MD5 muxer, it says:

By default audio frames are converted to signed 16-bit raw audio and video frames to raw video before computing the hash.

So, in your second command (without specifying any codec option), this'd be the equivalent of -c:a pcm_s16le, while in your first example, you keep the MP3 audio bitstream. That's why they have different checksums.

The proper way would probably be to disable video streams (if the MP3 file contains artwork, for example) using -vn:

ffmpeg.exe -i TEST.mp3 -vn -f md5 -

You can disable the other output by redirecting stderr:

ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL

On Linux, use /dev/null instead of NUL.

share|improve this answer

edited Feb 23 '16 at 12:22

answered Feb 23 '16 at 12:12

slhckslhck

161k47447470

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  now I get this MD5=6e08f3bb7e5e8cc27e2f77a7817abbba a bit more confused ... but I will change the file tags and see how it will be :)
  
  – Data-Base
  Feb 23 '16 at 12:24
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If the MP3 contains artwork, it'll be rendered as a video stream and used in the MD5 calculation unless you disable it with -vn. If you show the complete ffmpeg output in your question, we can have a better look at it.
  
  – slhck
  Feb 23 '16 at 12:25
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  after deleting all tags from file: ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL MD5=6e08f3bb7e5e8cc27e2f77a7817abbba ffmpeg.exe -i TEST.mp3 -f md5 - 2>NUL MD5=6e08f3bb7e5e8cc27e2f77a7817abbba ffmpeg.exe -i TEST.mp3 -c:a copy -f md5 - 2> MD5=886d08f4e9c5450ee12796b006307a33
  
  – Data-Base
  Feb 23 '16 at 12:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That makes sense now. (I was asking about the full output, without the redirection, to see what kind of tags there were, but you seem to have resolved the problem.)
  
  – slhck
  Feb 23 '16 at 13:41
  

  
  
  
  

add a comment | 

If you read the documentation for the MD5 muxer, it says:

By default audio frames are converted to signed 16-bit raw audio and video frames to raw video before computing the hash.

So, in your second command (without specifying any codec option), this'd be the equivalent of -c:a pcm_s16le, while in your first example, you keep the MP3 audio bitstream. That's why they have different checksums.

The proper way would probably be to disable video streams (if the MP3 file contains artwork, for example) using -vn:

ffmpeg.exe -i TEST.mp3 -vn -f md5 -

You can disable the other output by redirecting stderr:

ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL

On Linux, use /dev/null instead of NUL.

share|improve this answer

edited Feb 23 '16 at 12:22

answered Feb 23 '16 at 12:12

slhckslhck

161k47447470

ffmpeg.exe -i TEST.mp3 -vn -f md5 -

ffmpeg.exe -i TEST.mp3 -vn -f md5 - 2>NUL

share|improve this answer

edited Feb 23 '16 at 12:22

answered Feb 23 '16 at 12:12

slhckslhck

161k47447470

answered Feb 23 '16 at 12:12

slhckslhck

161k47447470

answered Feb 23 '16 at 12:12

slhckslhck

161k47447470