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Wed Jan 17 11:35:51 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027526.html

Hi Luca,

On Wed, 2007-01-17 at 11:28 +0100, Luca Abeni wrote:
> Hi Takis,
> 
> On Wed, 2007-01-17 at 10:40 +0100, Panagiotis Issaris wrote:
> > Hi,
> > 
> > Attached are two trivial patches with different approaches to prevent
> > the segfault as demonstrated by lol-ffplay.ogm.
> 
> [...]
> -                if (ost->video_resample)
> +                if (ost->video_resample && ost->img_resample_ctx)
>                      sws_freeContext(ost->img_resample_ctx);
> I think the real bug here is that ost->video_resample != 0, but
> ost->img_resample_ctx == NULL. So, this looks more a workarond than a
> real fix. I suspect the problem is a missing check for errors
> somewhere... I'll have a look later.
Yes, you are right.

> [...]
> void sws_freeContext(struct SwsContext *ctx)
> {
> +    if (!ctx)
> +        return;
> I do not know if calling sws_freeContext(NULL) is a bug or not... So,
> maybe committing this code is the right thing to do.
Thanks, committed.

> But I'd prefer to fix the calling code anyway. I'll check ffmpeg.c
> during the lunch break.
Excellent! :)

With friendly regards,
Takis

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Showing content from https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027526.html below:

[Ffmpeg-devel] [PATCH] Fix for the lol-ffplay.ogm testcase