Re: [Mlt-devel] Deinterlace / Frame doubling

[David N. <dav...@gm...>]

Hi Brian,

Cheers for the really quick response!

2017-04-07 22:51 GMT+02:00 Brian Matherly <co...@br...>:
*snip*
> On 4/7/2017 3:18 PM, David Noble wrote:
>> It appears yadif is used, but not in frame doubling mode.
>>
> <snip>
>
> I understand exactly what you are trying to do. The short answer is the MLT
> does not support frame-doubling deinterlacing. The expected behavior of your
> command is that MLT will deinterlace two fields into one frame and then
> double those resulting frames to achieve the requested frame rate. No matter
> how hard you try, you will lose temporal information if you deinterlace in
> MLT.
>
> I pursued this some time ago:
> http://mlt-devel.narkive.com/xJ5RNWDu/yadif-doubler
> The architecture of MLT makes this feature quite tricky.

Understandable. Thanks for pointing this out :-)

> After I grasped the difficulty of adding the feature to MLT, I decided
> instead to add a step to my workflow to normalize all my files. Here are
> some scripts which I use and you are welcome to use/modify:

Thank you very much!

> Also, I would mention that since I wrote those scripts, ffmpeg has added a
> new deinterlacing filter that combines the strengths of the yadiff and
> w3fdif filters:
> http://ffmpeg.org/ffmpeg-filters.html#bwdif
> I have had very good luck with the deinterlacing quality using the bwdif
> filter.

Excellent, I'll give this a look.

I think I'll also try a bit harder to see whether I can get the
avformat consumer to write to a named pipe. It seems that melt runs
pretty nicely with native interlaced stuff, so if I can just get that
out without an extra step of compression / storage, that would make me
pretty happy. I'll let you know how I get on :-)

Cheers,


David.