[FFmpeg-user] Video filtering for chroma dot crawl and rainbow effect

[Andy Furniss]

Christian Johannesen wrote:
> On Monday, January 25, 2016, Andy Furniss <adf.lists at gmail.com>

>> If you don't have access to better/"real" masters I don't think
>> you can get good results from this.
>>
>> What produced this file with height 486?
>
>
> The file was captured as 720x486 29.97 fps interlaced lower field
> first ProRes 422 HQ with an EVS OpenCube server from Beta SP tape.
> The resolution is used to retain line 21 data that would not be
> stored with a 720x480 capture.

OK, so you need to crop to 480 while it's still 422 and then do an
interlace aware scale to 420 before processing any further.

That's assuming you want to start with 420. I don't know whether or not
all the filters you need will work with 422.

Of course after yadif then you are progressive so if you did work in 422
then the final conversion wouldn't need to be interlace.

I noticed when testing the trac sample (I don't have access to others)
that I needed to specify bff for yadif - just another potential issue to
look out for.