[FFmpeg-trac] #3902(avformat:new): FFmpeg MD5 output different with same data #3

[FFmpeg]

#3902: FFmpeg MD5 output different with same data #3
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  ahthovaikied                       |                   Status:  new
                 Type:  defect       |                Component:  avformat
             Priority:  normal       |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:  md5 mpeg2    |  Reproduced by developer:  0
  ac3 mkv                            |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by ahthovaikied):

 Replying to [comment:35 michael]:
 > instead of -f md5 try to store the output in a file and find out with a
 hex editor what changes
 Without --disable-vaapi --disable-vdpau:
 {{{
 $ ffmpeg -loglevel quiet -i cut.mkv -map v -map a -c copy -f matroska
 /tmp/output1.mkv
 }}}

 With --disable-vaapi --disable-vdpau:
 {{{
 $ ffmpeg -loglevel quiet -i cut.mkv -map v -map a -c copy -f matroska
 /tmp/output2.mkv
 }}}

 Difference:
 {{{
 $ diff <(xxd -c 1 /tmp/output1.mkv) <(xxd -c 1 /tmp/output2.mkv)
 350,365c350,365
 < 000015d: 5d  ]
 < 000015e: 9c  .
 < 000015f: 9b  .
 < 0000160: b1  .
 < 0000161: 6b  k
 < 0000162: c4  .
 < 0000163: d5  .
 < 0000164: 23  #
 < 0000165: ce  .
 < 0000166: 29  )
 < 0000167: b1  .
 < 0000168: 3d  =
 < 0000169: 66  f
 < 000016a: ec  .
 < 000016b: ed  .
 < 000016c: b2  .
 ---
 > 000015d: bd  .
 > 000015e: b5  .
 > 000015f: e9  .
 > 0000160: 3d  =
 > 0000161: 15  .
 > 0000162: e3  .
 > 0000163: a7  .
 > 0000164: b2  .
 > 0000165: fa  .
 > 0000166: 14  .
 > 0000167: 4c  L
 > 0000168: 0a  .
 > 0000169: d2  .
 > 000016a: a1  .
 > 000016b: 7f  .
 > 000016c: 6b  k
 }}}
 It seems the difference is very minimal, I was expecting my terminal to be
 flooded with diff lines :)

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3902#comment:38>
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