[FFmpeg-user] -pix_fmt yuv420p and deinterlacing

[Katherine Frances]

Kia ora,

*Andy*: thanks very much for this tip! Will add that filter to the script
as I definitely want to deinterlace.
Do you recommend this over *yadif*, or do I need to combine *scale* with a
deinterlacing filter?

*Kieran*: Hey there! How did I miss that ffmprovisr included that?
Excellent and great point about its use in QCTools.

Thanks again,
K.

On Sun, Feb 26, 2017 at 1:31 PM, Kieran O Leary <kieran.o.leary at gmail.com>
wrote:

> Hi Katherine!
>
> On Sat, Feb 25, 2017 at 10:54 PM, Katherine Frances <knfrances at gmail.com>
> wrote:
>
> > Marton, thank you very much, this is extremely helpful.
> >
> >
> As Marton mentioned, the `p` refers to Planar, and the absence of `p` (as
> far as i can tell) suggests Packed - https://ffmpeg.org/doxygen/
> trunk/pixfmt_8h_source.html
>
> Okay, I guess that the output MP4s are actually interlaced, despite the
> > video stream metadata that MediaInfo reads. Do you think that
> 'progressive'
> > is default for libx264 and that's why this metadata property is being
> added
> > erroneously?
> >
> > Lastly, do you know how I can determine whether the file actually is
> > interlaced?
> >
> >
> As for interlacement checking, the idet filter works well -
> https://amiaopensource.github.io/ffmprovisr/#check_interlacement
> and if enabled in the preferences, QCTools does a really great job at
> visualising the output of the idet filter. I find it interesting to see the
> patterns produced by ingested tapes where some sort of deinterlacement
> occured for certain segments. Or looking at a file that has misleading
> metadata declaring interlacement (or progressive), but there is no evidence
> of that when looking at the actual file.
>
> -K
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