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

Dan Dennedy dan at dennedy.org
Wed Aug 12 21:40:59 UTC 2009

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'


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