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I am using ffmpeg, trying to convert 1080p to 1080i. I know that -vf tinterlace should do that, but I don't know the exact syntax of use. Currently I'm trying this:

ffmpeg -i <input file.mp4> -c:v libx264 -c:a aac -vf tinterlace <output.mp4>

When I check the generated output in a video analyzer tool like Mediainfo, I see that it's still progressive. I know there must be some mistake in the command. I need both top fields first and bottom field first formats of interlacing to be applied to 1080p source video content.

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Are you sure the mode you want is the right one? tincerlace has other modes that you might need. I'm thinking you need to supply another flag that tells x264 to do interlaced encoding, but I'm not sure at the moment. (Not a real fan of interlaced video—I avoid it wherever I can.) – slhck May 26 '13 at 8:59

Try -flags +ilme+ildct instead of -vf tinterlace

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Would you be able to give the entire command path? – Raystafarian Jul 18 '13 at 21:25

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