[FFmpeg-user] Best way to scale interlaced video

[Robert Krüger]

On Wed, Feb 26, 2014 at 10:13 AM, Massimo Battistel <battistel at gmail.com> wrote:
>>
>> > >
>> > > Do you really need 4:3 aspect?
>> > >
>>
>
> Yes, and with black bars above and below (to keep aspect).
>
>
>> That's correct; it's the 'interl' option to '-vf scale'.
>>
>
> Correct. If you look at the first message I wrote, that's solution #1.
> But, as I told previously, the resulting video is not good as expected.
>
> You can see the issue with any 1080i video using the following command line:
>
> ffmpeg -i sample1080i.mp4 -vcodec rawvideo -vf
> scale=w=720:h=432:interl=1,pad=720:576:0:72
> -acodec pcm_s16le -ac 2 -ar 48000 out.avi
>
> When image is not moving, you can see that horizontal lines have bad
> quality while vertical ones are fine.
>
> The solution #2 (the one with yadif and tinterlace) gives artifacts and
> Moiré effects on moving video, but gives very good still images (horizontal
> and vertical line have the same quality).

Have you tried enabling the low-pass filter
(http://ffmpeg.org/ffmpeg-filters.html#tinterlace) in your solution #2
(which looks ok to me) and checked if the results look better? It's at
least supposed to help with the Moiré.