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From: "arthur.marsh at internode dot on.net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/60902] New: ffmpeg built with gcc 4.9 RC produces incorrect flac playback code
Date: Sun, 20 Apr 2014 08:45:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60902

            Bug ID: 60902
           Summary: ffmpeg built with gcc 4.9 RC produces incorrect flac
                    playback code
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: arthur.marsh at internode dot on.net

Using the gcc-4.9 version 4.9-20140411-2 on Debian GNU/Linux amd64, I'm getting
incorrect code for ffmpeg flac format decoding (same source code compiled with
gcc-4.8 version 4.8.2-19 works fine).

The problem only affects some flac files that have nonetheless been passed as
valid by flac version 1.3.0.

The error returned is similar to:

[flac @ 0x7f3b540092e0] invalid subframe paddingB sq=    0B f=0/0
[flac @ 0x7f3b540092e0] decode_frame() failed

The bug report against ffmpeg is at:

https://trac.ffmpeg.org/ticket/3559

I am *NOT* a C programmer and am not familiar with the flac format decoding
process but am posting this in case anyone who is might be prepared to
investigate further.

Thanks for any help or suggestions.