[FFmpeg-trac] #8428(undetermined:new): ffmpeg has problems with some AC-3/EAC-3 files with "syncword" 0x770b

FFmpeg trac at avcodec.org
Fri Feb 21 23:46:30 EET 2020


#8428: ffmpeg has problems with some AC-3/EAC-3 files with "syncword" 0x770b
-------------------------------------+-------------------------------------
             Reporter:  zhidd        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by zhidd):

 i just had to find them out after data-mining a PS2 game called The
 Bouncer.

 ''strangely_encoded_ac3_file_that_hangs_up_after_two_seconds_when_decoding_or_playing_it_on_anything_else_that_supports_ac3.ac3''
 is (or at the very least appears to be) a legit AC-3 file that came from a
 .dat/.sz "video+audio" file as used by the game.

 ''dolby_digital_file_with_header_except_this_file_plays_way_too_fast.ac3''
 was sorta generated after passing through the game with PCSX2. simply put,
 the game has a built-in option for Dolby Digital as its output audio that
 only really works in some places. i can't really explain how the file
 ended up into what it was here.

 futhermore i can't really explain how the files were encoded/created in
 the first place because i was not responsible for the creation of these
 files either. i just had to find a sample.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8428#comment:7>
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