Arthur Bueno
Forum Replies Created
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Thank you Norman and John.
I have had nightmare experiences with large projects with quicktime media, but not since I useVegas 12.
I did some tests and indeed couldn’t find any differences after the extension is changed. The graphics card works just as hard, and a transcode to sony mxf with a color curves effect takes the same time, no matter if I do a graphics card or a CPU render. So I’ll risk native movs for the next project. -
I know, I’ve know Vegas quite well and never saw this happening before. I don’t have a clue where to start looking for the reason.
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I use handysaw all the time. Very good software, saves a lot of time if you need to re-edit archived films
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Yes, that was my conclusion too
My test and research also confirms to me that the downscaling capability of Vegas is not very good, not just from 4k to HD, but also from HD to SD (which a lot of people do, to produce dvd’s).
I hope Sony improves their downscaling algorithm. Or mybe some 3rd party plugin arrives (like the Virtual Dub Lancosz resize, or an OpenFX plugin) that can be put before pan/crop in the FX-chain. -
I did some testing:
Vegas on “Best’ gets a little bit fuzzy/ blurred,it looks a bit better with some sharpen filter.
On “Good” it seems a bit less blurry than on “Best”, but noise in the black background becomes a lot more visible.
I then rendered out to 4k uncompressed and resized within Virtual Dub with the Lancosz algorithm (that would also be possible through a frameserver, there’s a new version of Debugmode frameserver out for Vegas 11 btw, for a small donatian to the author). The result with the Lancosz alogrithm is considerably sharper then the two options before.
I also investigated MPEG streamclip, which is supposed to be good at downscaling. It looked good, but it totally changed the levels/gamma in the render to DNxHD.
I found some discussion on this issue at the reduser forum, they suggest to use the half-high (2K) red output instead of resizing, but that’s not an option for me, because I’ve been using Pan/Crop a lot in the project. -
It doesn’t seem right. Shouldn’t it be possible to render a sharp lowres image from a sharp highres image ?
Imagine there are a red square and a white square next to each other, with a razor-sharp border, so that in the 4k image one pixel is full red, and it’s direct neighbour is full white), how can it be then that in the downscaled HD image the color transition is not sharp anymore, but spread over (let’s say) four pixels (full red, reddish pink,whitish pink, white) resulting in an unsharp borderline. The unsharpness would then not imply ‘because of the smaller space there is less information’, but: ‘there’s more information spread out over a bigger space’.
I get the impression there’s something wrong with the way Vegas downscales… -
Hi John,
yes, I tried that too, and rendered from 4k project to BEST quality HD, but it gave no improvement. In the 4K project, the external monitor shows only a part of the image, in which you can see it’s quite sharp and crisp.After changing the project to HD, that sharpness is gone, the preview on the external monitor (at Best Full) has now the whole image, I’d expect it to give an even sharper/crisper impression, but it has become softer/fuzzier. I understand of courst that the resolution has gone down and detail gets lost, but the source never was an unsharp image, so why should the downscaled render be (slightly) unsharp..
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Hi Hayden,
Since only few people report this problem: could it be related to your video card? The Sony AVC rendering in Vegas 11 uses the GPU.
I don’t get any audio either, and have a 460GTX (MSI) card.
Vegas also refuses to render to Mainconcept AVC with GPU on, on this card, although it should support it. -
Actually I saw a plugin once that can either isolate or remove the voice from a song (sort of). It’s called ‘voice trap’, written by Trevor Magnusson, and you can download it at https://www.cloneensemble.com/. In a perfect world it would work seamlessly together with your lipsync program (but I also think singing along is the smart down to earth solution here).
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Ok, I tested it again: indeed playback is a bit faster in a preview window at preview auto (around 21 fps), then with Windows secondary display as Preview device (around 19 fps). Never is it full framerate.
But quite clearly the image in the preview auto setting is less sharp then at Preview Full, it’s actually quite a difference.
So the conclusion stands that playback of HDV at it’s full size and qualtity from the timeline isn’t possible in Vegas 7, even on a fast quad system.