[FFmpeg-devel] current way to tell if image is bottom up -possible bug

Michael Niedermayer michaelni at gmx.at
Thu Aug 23 22:21:49 CEST 2012

On Thu, Aug 23, 2012 at 02:51:26PM -0400, Don Moir wrote:
> >On 23/08/2012 2:26 PM, Don Moir wrote:
> >>So your saying extradata should contain "BottomUp" in this case? I always
> >>thought this was a bit strange and thinking a flag should be
> >>used instead.
> >>
> >>I don't know for sure if it ever worked in ffplay because I don't think
> >>ffplay ever checked for "BottomUp". Just saying its upside down
> >>in ffplay.
> >>
> >>For me, I check for "BottomUp" and invert if necessary and no
> >>longer can do.
> >>
> >>Just reply and I will report it as a bug.
> >i am not saying anything about extradata or BottomUp, just that if
> >it worked with ffplay in the past and no longer works then its likely
> >a bug, also if it works with some other player and doesnt work with
> >ffplay its likely a bug
> >To be able to say more i need a reproduceable testcase and sample
> >video
> I don't think it ever worked in ffplay but it worked in my app. Now
> it appears you cannot tell if a video is bottom up or at least in
> the following case.
> The method I use is to check extradata for "BottomUp" but no longer
> works. If there was a better way, I would use it.
> http://sms.pangolin.com/temp/upside-down.avi


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many things microsoft did are stupid, but not doing something just because
microsoft did it is even more stupid. If everything ms did were stupid they
would be bankrupt already.
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