Discovery?? Testing for Youtube HD encoding

+(I originally posted this in the Final Cut Pro forum, but didn't receive an answer and didn't know how to move it, so I'm re-posting here. Sorry for the double-post, I probably should have put it here in the first place.)+
Maybe I'm stating something obvious (or missing something), but the last few days I must have been through 50+ threads in the Apple forums and others for tips and trick on encoding for website delivery from my websites and for YouTube. I didn't find anyone say exactly this... but, the de-interlacing seems to come out much better when I re-size the media vs. encoding it to the same dimensions.
I exported from FCP as a QuickTime Movie, Self-Contained and took it into Compressor. I set the Frame Controls to all the best settings, but for the first couple of tests, I left the dimensions at 1920 x 1080 and no matter what I did, there was still some interlacing. In a couple of tutorials and posts, I saw recommendations of uploading to YouTube as 1280 x 720. I tried this, if you nothing else, to save file size. When I tried compressing again with this dimension, I could not find any trace of interlacing. Also, when I ran tests at 640 x 360 for my own website delivery, it also came out clean without interlacing.
Does this make sense?
*Other Questions:*
1. For smaller file size for my websites, should I take the Frame Rate down to 24 or leave it at 30?
2. How about the key frames, where is a good place to set this for decent quality and smaller files? I currently have the key frames set to 24.
3. Whether I compress using QuickTime Conversion or Compressor, if I set the Data Rate to restrict the size, the Data Rate always ends up being higher when I view in QuickTime (like 600k to 779k). Is there a reason for this?
Thanks,
Dave

David,
I have never seen this when setting Frame Controls: On, Output Fields: Progressive and Deinterlace: Better. Can you confirm you used those custom settings?
Yes, that is what I did (I also have the "Resize" Filter at Best (started with Better). With the de-interlace setting set to "Better" it still came out with interlacing, so I switched it to "Best" which didn't really improve it at 1920x1080.
Changing image size likely is "forcing" a kind of deinterlace since you are reducing the total scan lines.
This appears to be the way it is working for me on my system. I also had problems a couple of years back when I was outputting .flv files and had interlacing artifacts. I had to go out and buy the On2 Flix Exporter as QuickTime conversion was doing a poor job.
YouTube now accepts full 1920x1080 resolution. You should retain your native resolution.
I did originally run tests at the default resolution of 1920x1080, but as I said, no matter what settings I used, it came out with interlacing. It wasn't until I accepted the interlacing, and downsized the file to at least save bandwidth that I noticed it also got rid of the interlacing.
Changing frame rate from 30 to 24 will have NO effect on file size, it will only make your video choppy unless it was shot at 24 and you are now accurately removing the pull-down frames.
I guess I knew that, and maybe it's moot in this day and age, but doesn't 30 FPS vs. 24 FPS put a greater strain on the user's CPU? I've seen a few people recommend using 24 FPS for this reason. Again, maybe in 2010 this is not so much an issue anymore. A number of Compressor tutorials and settings suggestions are date 2007-2008. It's hard to find current info on export settings.
Your final file size is determined ONLY by the data rate (bits per second)
Makes sense.
Keyframes- I typically set to Automatic.
Seems reasonable, but why do so many tutorials recommend setting this to either 24 or 150? Is this again info from a few years back that is less relevant today?
Stated data rate in QuickTime: Are you accounting for the audio data rate? When compressing a file you set the video and audio data rates separately, when played back in QuickTime they are summed together.
You are correct. I spaced on the audio being added in ("Duh, gee George, can we keep the rabbit?")
I appreciate your time.
Thanks,
Dave

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from You Tube:
!http://www.spotsbeforeyoureyes.com/YouTubeBestFormats.jpg!

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Last edited by teckk (2013-08-18 22:49:36)

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In every aspect of life there is no such thing as one best option as it all depends on your particular circumstances.
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http://eugenia.gnomefiles.org/2007/12/08/exporting-with-adobe-premiere-in-720p/
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Revision: 18814
Revision: 18814
Author:   [email protected]
Date:     2010-11-24 09:31:56 -0800 (Wed, 24 Nov 2010)
Log Message:
Add manual test for BLZ-594 with instructions on how to run the test.
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Discovery?? Testing for Youtube HD encoding

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