[FFmpeg-user] Transcoding Iphone Portrait videos to DVD

[Roger Pack]

> 1) Rotate the video by 90* clockwise.
> 2) Adjust the video to be in DVD NTSC/ PAL format (4:3) such that the video
> is not scaled/ distorted.
> It is okay to crop/ pad to adjust the video to a different width/ height.
>
> I can easily do 1) by using "-vf transpose=1".
>
> But I am having a bit of problem doing 2) above.

-format ntsc-dvd
might help
Assuming you know the aspect ratio previously, you could add some "pad" to it:
http://ffmpeg.org/ffmpeg.html#pad