[FFmpeg-user] turning a video upside down without reencoding

meino.cramer at gmx.de meino.cramer at gmx.de
Mon Feb 3 19:08:03 CET 2014

Matt Zagrabelny <mzagrabe at d.umn.edu> [14-02-03 18:44]:
> Hi mcc,
> On Mon, Feb 3, 2014 at 11:36 AM,  <meino.cramer at gmx.de> wrote:
> > Hi,
> >
> > Is it possible to turn a video upside down without reencoding it OR
> > to set a flag in the file so that mplayer/ffplay will play it upside
> > down?
> From the mplayer man page:
>        # Use Matrox driver by default.
>        vo=xmga
>        # I love practicing handstands while watching videos.
>        flip=yes
>        # Decode/encode multiple files from PNG,
>        # start with mf://filemask
>        mf=type=png:fps=25
>        # Eerie negative images are cool.
>        vf=eq2=1.0:-0.8
> I only searched for the word, 'flip'. If you do that you'll probably
> come across the flag.
> -mz
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...and you found what I have found already. Additonal you didnt read my
posting carefully enough.

As I understood the mplayer manpage, the "flip" option must be
set with each call to mplayer. That implies you know the contents of
the video in beforehand. That implies that a mixed bunch of files --
some needs to be flipped, others not -- must be treated individually.

That is not what I have intended.

I want a file which is either flipped physically without reencoding
(and therefore this attribute became part of the file itsself) or
which has a flag set, which instructs a player to flip the video while

This way all files can be treated the same way.

The configuration file set the "flip" for mplayer and not for files,
from which I dont (want to) know which needs to be flipped or not --
beside the one time, I either flip the file physically (without
reencoding) or set the flag in the file ittself (see above).

Hopefully this made clear, what I want.


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