[FFmpeg-user] -pix_fmt yuv420p and deinterlacing
cus at passwd.hu
Sun Feb 26 00:35:42 EET 2017
On Sun, 26 Feb 2017, Katherine Frances wrote:
> Hi Martin,
> Oh! Thanks for letting me know. I just assumed the conflation of the two
> things here.
> But then, how are my output videos becoming deinterlaced?
Probably they are not.
> Inputs are uncompressed v210 in MOV. They're definitely interlaced, as
> they're digitized from an analogue source (using an AJA ADC) with all
> correct setup.
> And outputs are definitely progressive, at least according to MediaInfo.
Mediainfo only shows the metadata, in reality the content is most probably
> I'm just using a basic script, for example:
> ffmpeg -i uncompressed_master.mov -c:v libx264 -pix_fmt yuv420p -c:a
>> libfdk_aac -b:a 128k access_copy.mp4
> So how are my MP4s becoming deinterlaced? Is it a result of declaring MP4
> as the output container? I thought that MP4s could contain interlaced
> content - am I wrong about that?
AFAIK ffmpeg does not do automatic deinterlacing based on container
features, so even if MP4 were progressive-only (it is not), ffmpeg still
would not do automatic deinterlacing.
The fact that the interlaced metadata is not reflected in the output can
be caused by a number of reasons, either the source file is missing the
interlaced/progressive metadata as well, or ffmpeg simply does not support
propagating it to mp4.
In any case, if you want to deinterlace, use a filter, like yadif.
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