[Ffmpeg-devel] [BUG] MPEG 2 Division By Zero

[Benjamin Larsson]

Brian Brice wrote:

> M?ns Rullg?rd wrote:
>
>> Brian Brice <bbrice at newtek.com> writes:
>>
>>> Brian Brice wrote:
>>>
>>>> M?ns Rullg?rd wrote:
>>>>
>>>>> Brian Brice <bbrice at newtek.com> writes:
>>>>>
>>>>>> Hello.
>>>>>>
>>>>>> Something quite strange is happening when I'm encoding MPEG 2.  I'm
>>>>>> encoding clips that are just noise and I get "division by 0"
>>>>>> crashes.
>>>>>> Unforunately, I can't produce a call stack (using DLLs in Windows
>>>>>> from
>>>>>> VC++), but I did narrow down where the division is occurring:
>>>>>
>>>>> Upload a sample and tell us an FFmpeg command line that reproduces
>>>>> the
>>>>> error.
>>>>>
>>>> Unfortunately I'm not using the command line. :-(
>>>> I am linking to the DLLs produced by mingw/gcc from within Visual
>>>> Studio.  And I know it's not a VS problem (so don't bash, please?),
>>>> because this stuff has worked before.  I am programmatically
>>>> generating
>>>> frames of noise and throwing them at the encoder.  I set only certain
>>>> members of AVCodecContext (as mentioned in the first email), and leave
>>>> the rest to default.
>>>>
>>> Sorry, I spoke too soon.  Right after I sent that message, I tried
>>> making an uncompressed AVI with this noise then using ffmpeg on the
>>> command line to reproduce.
>>>
>>> I uploaded a sample to /MPlayer/incoming/VictoriasNoise
>>>
>>> Here is a log of the execution:
>>
>>
>> Does it crash?
>>
>
> Yes.  Unfortunately mingw/gdb doesn't give a good backtrace.  GDB:
> (fyi, my ffmpeg binary isn't stripped)
>
> pollux:~> gdb ./ffmpeg


Do you have ffmpeg_g ?

MvH
Benjamin Larsson

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