Bug#540424: [Mlt-devel] Bug#540424: SIGV with a DIF (DV) movie file (PAL)

Dan Dennedy dan at dennedy.org
Thu Aug 13 04:20:16 UTC 2009

I attached a patch rom FFmpeg SVN that fixes this problem for me. The
commit message is:

r19192 | bcoudurier | 2009-06-14 15:34:28 -0700 (Sun, 14 Jun 2009) | 1 line

check if frame size matches old sys and assumes corrupted input, fixes #1192

On Wed, Aug 12, 2009 at 2:40 PM, Dan Dennedy<dan at dennedy.org> wrote:
> On Wed, Aug 12, 2009 at 1:16 PM, Reinhard Tartler<siretart at tauware.de> wrote:
>> Dan Dennedy <dan at dennedy.org> writes:
>>>>>> Thanks. Is someone able to reproduce this bug with ffplay? I've
>>>>>> tried, but didn't manage to create segfaults out of it.
>>>>> No, it did not segfault for me either, but it did become
>>>>> unresponsive.
>>>> this is normal behavior. ffplay does not quit automatically at end of
>>>> file, but you can exit it with pressing 'q'.
>>> No shit. This is not what I was talking about. I resent the
>>> condescending tone you take with someone who actually writes code
>>> against the ffmpeg libs. Try clicking around on the window. Seeking
>>> into the first 3 playable seconds of this 10 minute clip fails.
>> I asked in my mail before if the file was only 3 secs or longer. Okay,
>> playback stops for me after 3 seks as well, which means that I can
>> reproduce it as well. At least, I can now investigate the issue further.
> Well, thank you for not flaming back. I have to correct my assertion
> that it is a 10 minute clip - I meant ~10 seconds.
>> [...]
>>>> I have no plans to stop tracking the 0.5 release branch, so yes, we'd
>>>> need a patch for the 0.5 release. In fact, the 0.5 release branch *is*
>>>> updated with updates, and there is even a 0.5.1 release in the pipe.
>>> And do you think you are more qualified to maintain FFmpeg than the
>>> FFmpeg project itself?
>> The 0.5 release branch *is* maintained by the FFmpeg project
>> itself. They provide the 0.5 release as syncronization point for
>> downstreams to share a common code base.
> I am going to take another crack at locating the fix, but I am not
> going to make a promise or overly exert myself. If you or anyone else
> intends to look at it further, the easier way to test and induce a
> crash in the debugger is to use the MLT command line player: melt
> dvgrab...dv. After playing through the first 3 seconds, press 'h' to
> seek backwards one frame, and it should crash. If not, play a bit
> longer and then 'h'
> --
> +-DRD-+
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