Content Problems

[basicmonkey]

I seem to get lots of Interlace artifacts (lines on motion) when playing back 1080i material through cat, i have tried a few formats in compressor, including AIC and PhotoJpeg, but it seems it's not so much the format but de-interlacing that matters.

In compressor I've tried de-interlacing the HD files and while taking a very long time does actually solve the problem.

I know this isn't a cat issue as QT seems to have trouble with 1080i HDV files, but is de-interlacing with compressor the only option?

Also I do love your new hidden feature, would a de-interlacing AIC option be possible in the future? tried the AIC one and still has those dam lines.

Thanks,

James

[samsc]

you need to deinterlace the content, you need to work with either the content creator to ensure its frame rendered or you need to deinterlace yourself using whatever tools you have.

you will need to experiment.

there is not a single answer to the best way to deinterlace.

the interlacing is NOT a codec thing. its a content problem irrespective of codec. doesnt matter which codec you use.

[samsc]

Also I do love your new hidden feature, would a de-interlacing AIC option be possible in the future?James

its possible to do simple deinterlacing by throwing away one half of the image- every other line.
but this isnt always acceptable-

this is what final cut does- in its simple deinterlace options.

[samsc]

i have never tried this software - but it claims to do some of these things

jes-deinterlacer
http://www.macupdate.com/info.php/id...s-deinterlacer

there is also fields kit from revision fx

http://www.revisionfx.com/products/fieldskit/

and most editing and fx programs do deinterlacing as an fx on a layer.

[roberto_novelli]

check

[samsc]

I know this isn't a cat issue as QT seems to have trouble with 1080i HDV files, but is de-interlacing with compressor the only option?

James

HDV 1080i files - depends on the camera - and whether the camera shot interlaced or progressive.
My V1P makes progressive 1080i frames.
Most HDV cameras dont do this.

Suggest all HDV files are converted to apple intermediate codec.

[SourceChild]

I cannot begin to tell you how many times I have had this problem. I have several church clients who all want "the outdoors" on their screen "indoors" (go figure).

Bottom line is they all tend to use camera footage which is interlaced. In addition to that, I also get tons of IMAG feeds which are also interlaced.

It's a nightmare

Here is the solution. Don't tell the content creator anything about the output file or the or the aspect ratio. Instead, have them export their files as close to uncompressed as possible in either a standard 3:4 size or a 9:16 size.

Just give them the crop specifications to create a window proportionate to the output screen.

What I mean by this is for example if you have 3 1024x768 projectors doing an edge blend of 25%, you'll end up with 2048x768. If you do the math, a scale conversion of that is 1920x720. This means that you tell your content creator to make an HD file at 1080p but you tell him the window frame is 1920x720 and the top and bottom strips 180 pixels are just dead space.

Once he outputs the file and sends it to you, you do the conversion, crop the file, and render it in the correct codec using one of the nicer programs like Richard mentioned for doing your interlaced to progressive conversions.

Incidentally, there is another thread that talks about i vs p and I would recommend you read it because there is a website link in there that shows just what kind of problems you'll run into converting from interlaced to progressive.