[FFmpeg-trac] #3524(avcodec:new): FFmpeg MD5 output different with same data

FFmpeg trac at avcodec.org
Thu Apr 3 21:28:43 CEST 2014

#3524: FFmpeg MD5 output different with same data
             Reporter:  ahthovaikied  |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  avcodec
              Version:  git-master    |               Resolution:
             Keywords:  aac           |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |

Comment (by jamal):

 Replying to [comment:5 cehoyos]:
 > What I meant was: I tested several different aac samples with and
 without {{{--disable-avx}}} on an Ivy Bridge and was unable to find a
 difference in the output of {{{ffmpeg -i input.aac -f crc -}}}.
 > Do you have a sample that produces different output with and without
 No, just checked and can't find any where the output is different. It
 seems that only LTP profile aac files use our handwritten AVX functions
 for that matter.

 Also, as you said ahthovaikied used two different compiler versions. On
 top of that one configured with --cpu=corei7 and the other --cpu=core-
 avx-i, so even more chances for different float output.

Ticket URL: <https://trac.ffmpeg.org/ticket/3524#comment:7>
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