[FFmpeg-devel] Controlling the Pixel Aspect Ratio (PAR)
michaelni at gmx.at
Fri Apr 1 02:32:09 CEST 2011
On Mon, Mar 14, 2011 at 01:39:36PM -0400, Tony Strauss wrote:
> I originally posted this to ffmpeg-user, but I'm now contemplating
> writing a patch:
> I need to break videos up into frames (.tga, TARGA format frames).
> These videos are uploaded by users and can come in a variety of
> formats. I can accomplish this with a command like:
> ffmpeg -i movie.wmv -r 24 -f image2 images%05d.tga
> I run into issues, however, when the pixel aspect ratio (PAR) of a
> movie is not 1:1. For example, a movie with a resolution of
> 1440x1080, a PAR of 4:3, and thus an aspect resolution (DAR) of 16:9
> results in incorrect .tga frames. The frames have resolution
> 1440x1080 and a PAR of 1:1. It's not clear whether ffmpeg's .tga
> encoder understands pixel aspect resolution, but, in any case, I need
> frames with a pixel aspect ratio of 1:1 for my purposes. As far as I
> can tell, the only way to force ffmpeg to encode the frames with a PAR
> of 1:1 is to specify the frame resolution.
get latest ffmpeg git
use -vf setsar=1
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Avoid a single point of failure, be that a person or equipment.
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