Video File properties
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I am reendering source m2t file that is 1440X1080 50i PAL into avi file using Lagarith codec. Trying to leave other properties unchanged in order to not loose quality. I read out file properties in Vegas and here is what I get:
Source file Streams Video: 00:01:00.000, 25.000 fps interlaced, 1440x1080x12, MPEG-2 Audio: 00:01:00.000, 48,000 Hz, Stereo, MPEG Layer 2 Output file Streams Video: 00:01:00.000, 25.000 fps interlaced, 1440x1080x24, Lagarith Lossless Codec Audio: 00:01:00.000, 48,000 Hz, 16 Bit, Stereo, Uncompressed I can see that 1440x1080x12 turned into 1440x1080x24 . What does that last digit in resolution mean? Is it important to keep it at 12? Where do I select it to be 12? couldn't find in Vegas. I also attached Vegas Project Media screenshot where I loaded source file and output file. I can see that source file filles complete screen on the icon, where output file does not (has black bars on the top and bottom). Why is that? |
Re: Video File properties
It's the color bit-depth of the image.
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Re: Video File properties
Thank you. I am beginner, not sure what that means. Does going from 12 to 24 in color bit-depth degrade quality? do unnecessary step? take more time to reender?
Also, I didn't see an option in Vegas to select target color bit-depth... |
Re: Video File properties
You can change the color space that Lagarith encodes to, in the render window go to advanced properties of Lagarith.
Unless you are doing some heavy keying or color correction, just leave it at the defaults, its plenty good enough for most projects. Your black bars are more of a problem, whenever converting 1440 footage, make your project 1920x1080 with square pixels and convert your footage to these dimensions as well. It avoids all non square pixel probs. |
Re: Video File properties
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Re: Video File properties
1 Attachment(s)
Attached are advanced settings for Lagarith codec, where can I change color bit-depth?
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Re: Video File properties
1440 x 1080 is displaying at 1920x1080, it just does it with rectangular pixels rather than square.
Your delivery format at 1280x720 is a scaled down version of 1920x1080 not 1440x1080. When you convert to your intermediate codec, in this case Lagarith, to preserve your quality and simplify aspect ratio, myself, and lot of other people, convert it to the full size of 1920x1080, do all your editing, render out a master at 1920x1080 then render out your different delivery formats, ie, a 720p for web, 1024x576 for DVD etc |
Re: Video File properties
On the 'Mode' dropdown.
As mentioned before RGB is plenty good enough for most jobs. |
Re: Video File properties
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You are probably right , but I just don't follow the logic. I shoot 1440X1080 or in other words 1,333 pixel aspect ratio. My final format will be PAL DVD or 720 X 576. Still do not understand why would upscalling to 1920X1080 help, especially whent it is different aspect ratio. In my view it will actually take my original aquare pixels and make them rectangular... And it is also resizing (1440X1080 -> 1920 X 1080) , which based on threads in this forums should be done outside Vegas (VD or TMPGenc) |
Re: Video File properties
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Your original 1440 x 1080 footage does not contain square pixels because it squeezes the 1920 horizontal pixels to just 1440, so you lose 25% of the horizontal information. Such video is displayed as 1920 x 1080 on a standard 1920 x 1080 HD screen because the player upscales the 1440 non-square pixels to 1920 square pixels. And since you have no control over the player and since different players may be using different upscaling algorithms, the only way to get consistent quality in the various 1920 x 1080 screens is to have Vegas (or whatever editing software you use) to upscale it and then do any editing with the upscaled version. This will not magically recover the missing 25% of information, but it will guarantee consistency among all players. When later exporting to a DVD, you can have the editor downscale it to the size used by the DVD, while keeping your option to also (or later) release it in proper HD. |
Re: Video File properties
What Adam said :)
Just give it a go the way I said, see if your results are any better than editing 1440x1080, 1.3333 aspect then exporting to 720x576. 1.4568 aspect ( arghh, just looking at it like that hurts my brain) If its no better, discard it. :) |
Re: Video File properties
without being rude, why?
you state you're a beginner, and we all have to start somewhere, but why dive in with esoteric codecs and the headaches they can cause unless you REALLY need a lossless medium for some other purpose? |
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Re: Video File properties
please don't let me stop you experimenting.....
however, i think you'll find that going straight from hdv to dvd in vegas / arch will give you almost indistinguishable results as that made by going via an intermediary codec. please, if you find otherwise i'll be happy to retract that statement. |
Re: Video File properties
Was away for a week, back to my project now.
Ok, I will of course ready to try various solutions and I am trying with following steps. Captured video with Sony Vegas into m2t file at 1440X1080 (non square pixels) Reender with Sony Vegas using Lagarith codec into avi file at 1920X1080 (square pixels 1,7778 aspect ratio) Resize with TMPGenc to avi file at 720X576 (not sure what kind of pixels 1,25 aspect ratio...) Will try to keep video interlaced during the whole process. |
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