ConverttoYUY2() with interlaced=true or not, source encoded as interlaced

[Boulder]

I recall that this thing has been discussed before but I think it never came to a conclusion.

So: I capture a DVB clip which is encoded as interlaced even though the source itself is progressive. Should I use ConverttoYUY2(interlaced=true) or ConverttoYUY2()?

[foxyshadis]

Doesn't matter. It'll change the chroma slightly, and if you're a purist you might want to make sure it gets done at the decoder stage (like dgdecode's upconv=1), but it won't be very noticeable. It's merging the chroma of temporally shifted lines that sticks out like a sore thumb.

I finally had this beaten into my head by scharfi. >.>

[tritical]

I'd agree with foxyshadis that you probably couldn't tell the difference either way. Technically though, using the progressive yv12->yuy2 conversion to upsample the chroma of a progressive frame that has been encoded as interlaced yv12 should give better quality due to the way the weights line up (assuming the downsampling was done correctly).

[abysas]

I remmember such a discussion a couple years ago, but it was in conjunction with CCE, how to recompress progressive (PAL) DVD marked as interlaced. The conclusion was to use ConvertToYUY2(interlaced=true) and in CCE set progressive encoding mode.