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Re: Compressor's best 23.98 to 29.97 conversion?

COW Forums : Compression Techniques

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Mark Spano
Re: Compressor's best 23.98 to 29.97 conversion?
on Mar 23, 2010 at 5:01:52 pm

[Alan Langdon] "1- Is there a way to make those added frames interlaced using compressor, achieving a similar smooth motion?"

Yes, but as previously commented, if you're going to DVD, you should stay at 23.976p. It's in the DVD spec, and all DVD players can add pulldown seamlessly. Plus, having 6 less frames per second means you can spend more bits during compression on quality.

[Alan Langdon] "2-But then, since most TVs are now LCD and Plasma, not exactly interlaced, is this a good idea afterall?"

You have the right idea in theory: if your DVD player outputs progressive frames (most these days do) and it's hooked up via HDMI or component to a progressive display, there will be no interlace/deinterlace processes happening, and the picture will be sharper. If either of those things aren't true, then the DVD player will add interlacing and the display will deinterlace.

[Alan Langdon] "3- Another artifact I am getting from Compressor's convertions is a sort of pulsing of the image every 15 frames or so, probbly due to the GOP structure of the VBR of Compressor. Now, I am sure VBR is the best way to go, so how can I liminate this pulsing, which is unacceptable? Others here at the Cow have suggested I use CBR, which I am doing, but is taking a long timt to convert because I incremented the quality of other settings availabl... My 20 minute short film is taking about 30 hours to convert!"

Your short is 20 minutes - my advice is to compress with CBR, with an IP GOP structure. I usually use about 6.5Mbps for video and make sure that the audio is compressed with AC3. Total bit rate won't exceed 7.5Mbps even with multiple audio tracks and all DVD players can handle playing it back. Motion estimation should be set to Better - only use Best if you want to wait a while. Turn on Frame Controls and set Resize to Better, same as source fields, fast for everything else. Output frame size should be 720x480 with 16:9 pixel aspect ratio. A good thing to check as well is how Compressor is interpreting your source footage. Before you add your compression setting, check the inspector and make sure it's set to progressive. Occasionally it reads things incorrectly and winds up doing a lot of unnecessary processing as a result.

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