[FFmpeg-user] ntsc-dvd doesn't default to interlaced.

[Andy Furniss]

Andy Civil wrote:
> On 2013-07-27 6:30 PM, Andy Furniss wrote:
>
>>
>> ffmpeg seems to be able to scale interlaced as long as you tell it -
>>
>> -vf scale=720:576:interl=1  ...
>
> I was a long hold-out on MEncoder because for years it was the only one
> that had interlace-aware scaling, but now, FFmpeg does it all.
>
>> -target pal-dvd
>
> I think life may be slightly different for you, in PAL world. I won't
> quote what I think the difference is, for fear of getting it wrong, but
> I am sure that it's different.

I don't know to be honest.

>
>> One wierd thing is that I got that from a post ages ago and it had an
>> extra
>> argument -
>>
>> -vf scale=720:576:interl=1,fieldorder=tff
>
> Field order is the thing. I was going bananas trying to get this working
> until I realised that my HD camera was producing TFF video, and I needed
> BFF video for the DVD. The ridiculousness of this situation was what
> prompted me to get my movie editor to deinterlace into 59.94p for my
> intermediate file, and then asking FFmpeg to scale and interleave

I don't think that's true as has been mentioned elsewhere, dvd uses 
mpeg2 and mpeg2 will handle bff or tff as long as it's flagged correctly.

>> Of course my sample was 420 - I don't know what the OPs is, so that
>> would be
>> something to consider if he wanted to scale direct instead of de then re
>> interlacing.
>
> Because of the field switch, I don't think I can 'scale direct'. Let's
> face it, even if I thought I was doing it, most likely it would be
> converted to progressive, scaled, and re-interlaced in the background
> anyway! I might as well have it out in the open and control it. That's
> why I like command line tools ;-)

Fair enough, it's working results that count I suppose :-)