How to get an aliasing free DVD from a 1080p50/60p source

[FelixGER]

Hi,

I´d like to use 1080p50 on my FS100 because it´s an allround format. It can be used for a 1080i bluray, a 576i DVD or as 720p50 for web distribution. It´s perfect.
BUT yet I was not able to produce a sharp aliasing free classic interlaced PAL DVD. For 1080p60 -> 480i it should be the same issue.

Technically the NLE / Encoder just needs to take every full frame and convert it to an interlaced frame (50% even frames, 50% odd frames)
That works fine as long a I stay in 1080 resoultion.

Workflow example:

1. Import 1080p50 file into Vegas
2. Render to a cineform (Sony AVC oder Mainconcept mpeg2 also work) master as 1080i50
3. When played back it looks great. Perfect for interlaced bluray (just like all the documentary HD programs like History HD or Discovery HD, which all use interlaced HD)
4. Import the File into an encoder like TMPGEnc (I use TMPGEnc and it produces wondefull progressiv DVDs, 25p)
5. Rendering to 576i mpeg 2
6. Burning a DVD-Video using DVD Architect without any recompression.

The result is awful! Alasing artifacts everywhere!

In Tmpeg I can uncheck the box "Output interlaced with high quality resize"
http://www.imagebanana.com/view/vpy16a5s/resize.PNG

That gets rid of the aliasing but softens the picture a lot. Not really usable.
Using Vegas for the whole workflow is even worse (1080p50 -> Mainconcept mpeg 2 interlaced DVD)


QUESTION: Is there a software/workflow solution that can produce a good looking interlaced smooth PAL DVD out of 1080p50 (same for 1080p60 to a NTSC DVD)

 

[JeganRX]

TMPGEnc likely has poor to no support for interlaced rescaling of footage. In other words, you should keep your source progressive until it is converted to 576p.

My preference for encoding is to create progressive/interlaced masters of each resolution I'm outputting to.

EDIT: Missed your picture. Many encoders use a low pass filter on their resizers, or simply use softer resizers like a bilinear method, to eliminate interline-twitter between fields. Again, I suggest resizing before bringing into TMPGEnc.

 

[FelixGER]

Tried it.
Made a 720x576p cineform master and renderd it in TMPGEnc.
Doesn´t look good...

I think I need a more sophisticated encoder.

 

[JeganRX]

Question: How are you previewing the material? This sounds trivial I know, but many PC players will attempt to deinterlace the content... just in case you're not previewing on a proper interlaced display?

If you want, you can interlace the master before encoding it in TMPGEnc by using AVISynth.

 

[FelixGER]

I´m watching it on my well calibrated Panasonic LCD TV using a Panasonic Blu-ray Player.
I´ll have a look at AVISynth. Thank you!!