[FFmpeg-user] Questions about w3fdif deinterlacing

Paul B Mahol onemda at gmail.com
Fri Jan 17 16:28:49 CET 2014

On 1/17/14, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> Seth Parker <csparker247 <at> gmail.com> writes:
>> Here's a zip with the sample as well as some tests I ran:
>> https://dl.dropboxusercontent.com/u/13015285/ffmpeg_samples.zip
> $ ffmpeg -i sample.mov -vf idet -f null -
> reports:
> Single frame detection: TFF:149 BFF:0 Progressive:0 Undetermined:0
> Multi frame detection: TFF:149 BFF:0 Progressive:0 Undetermined:0
> $ ffmpeg -i sample.mov -vf yadif=1:parity=tff -qscale 2 out.avi
> works as expected.
> I couldn't find the parity option for w3fdif;-(

If flags are not set you need to use filter that set them like setfield
filter or guess them like idet filter.

parity option is not there because it would just dupe setfield filter.

> [...]
>> ffmpeg -i sample.mov -c:v libx264 -pix_fmt yuv420p
>> -vf "idet, w3fdif" sample_idet_w3fdif.mp4
> As said, this makes no sense.
> (There is no magic in idet that makes the command work.
> I suspect it is easy to implement the "magic" somehow
> but I doubt it would work well: "Undetermined" frames
> are not unusual.)
> Please do not top-post here, it is considered rude.
> Carl Eugen
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