[FFmpeg-user] (de)-interlacing question

[Andy Furniss]

Toerless Eckert wrote:
> On Tue, Nov 22, 2016 at 01:58:07AM +0100, Carl Eugen Hoyos wrote:
>> I was sure that the "deinterlace" option is deprecated and
>> therefore not documented, I realize that it works and no warning
>> is shown but I would still recommend that you choose the
>> deinterlacer you want, there are several to choose with different
>> qualities.
>
> Ah, ok. that explains it. I thought most simple CLI options means
> its the most likely good default.
>
> Any deinterlacer thats parallelized like the codecs (x264 etc..) ?
>
>>> 2. The 50i material i get from TV nowadays seems to be 720 at 25p
>>> material that was motion interpolated to 50p, scaled down and
>>> then sent interlaced. Aka: every second field is probably just
>>> invented by motion interpolation. Which is quite annoying
>>> because IMHO this makes 50% of the bits mostly fabrication
>>> instead of actual source bits.
>>
>> Command line and complete, uncut console output missing, a sample
>> will probably be needed.
>
> No ffmpeg/CLI involved in that theory. Just download SD and HD
> versions of some current ARD/ZDF TV production and check it (i used
> vlc single step).  Oh well, its still a lot easier than dealing with
>  NTSC/ATSC telecine problems except that its easier to find recipes
> on the web for ATSC/NTSC coding.

Seems strange that that would happen. It certainly doesn't in the UK,
25fps progressive SD does get flagged as interlaced, but there is no
interpolation. Have you tried frame stepping with say mplayer - it could
be that vlc is adding filters because of the flags.

Also noted you say "Just download" which makes me wonder whether you are
talking about web content rather that broadcast.