Re: [FFmpeg-user] How to re-encode 3d video to 2d video

[Cley Faye]

Le 6 juin 2016 03:36, "jd1008"  a écrit :
>
> Is this the way to convert a 3d vid to 2d?
>
> Moritz had replied to another question of how to play 3d vid on computers
> not capable of playing 3d. So I used his -vf options as follows:
>
> ffmpeg -i the_3d_video.mp4 -r 29  -vf
"crop=w=iw/2:h=ih:x=0:y=0,scale=w=2*iw:h=ih,setdar=2"  -y the_2d_video.mp4
>
> The command above is still running, and will likely take hours on my slow
computer.
>

From your filter command I assume it's a 3D half side by side video. As far
as i know, any operation to turn one of the view into a full-resolution
video will need encoding and that process takes time. There are command
line options to speed up the process, but anything high quality will be
time consuming.

Your best bet here is to either find what settings you find acceptable to
balance quality and speed, or use a player that can fake it.
(With some container it might be possible to do that through metadata but
even so, finding a player that would understand it is another matter)
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[FFmpeg-user] How to re-encode 3d video to 2d video

[jd1008]

Is this the way to convert a 3d vid to 2d?

Moritz had replied to another question of how to play 3d vid on computers
not capable of playing 3d. So I used his -vf options as follows:

ffmpeg -i the_3d_video.mp4 -r 29  -vf 
"crop=w=iw/2:h=ih:x=0:y=0,scale=w=2*iw:h=ih,setdar=2"  -y the_2d_video.mp4


The command above is still running, and will likely take hours on my 
slow computer.


P.S. using ffmpeg-2.1.8-1.fc20.x86_64
because this computer is stuck at fc20 and upgrading to fc23 breaks 
other things.


Thanx!

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Re: [FFmpeg-user] ffmpeg cutting movies into multiple parts

[Moritz Barsnick]

On Sun, Jun 05, 2016 at 11:56:52 +0800, blubee blubeeme wrote:
> The line above "$OUT_DIR" doesn't work and throws a cryptic error.

It may be cryptic to you, but if it comes from ffmpeg, it most likely
has a meaning. And it's one of the two things you didn't tell us. ;-)

More precisely: Please post the full command line (unscripted) and the
complete, uncut console output.

When running a bash script, you can dump the actually used command line
by running with "bash -x".

Moritz
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