FFMPEG YUV extraction: missing frames

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I've tried to extract YUV frames from TS/m4v file using FFMPEG. I've found that all the frames displayed prior to first decoded frame are not extracted. usage: ffmpeg -i

Is there a method to extract these frames? Is there another method to extract YUV?

BTW, by first transcoding and than extracting YUV, I get these frames. The point is that I need the original YUV and not the transcoded one.

Thanks

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