Quality Problem When Using Sony Vegas to Edit

[newsgroup guy]

Hi.

I have a small complaint about Sony Vegas.
Whenever I edit, let's say, a MP4, but it could be any file, I suppose, and then output the result (again a MP4 - I usually output MP4s, nowadays -), there's a very delicate loss of quality.

I'm talking about some bleeding of the image.
Whenever there is fast movement on the screen (while playing the output file), the items that are moving look significantly more blurry than (when moving) in the initial file.

I hope I'm explaining this properly.

I'm using the same settings. I'm not asking Vegas to convert from 23.976 to 29.97 fps, or anything like that.
So, I don't get why the quick movements are not as smooth in the resulting file.

Is there, maybe, an option I should enable or disable to make this better?
I'd like the best quality.

Thanks.

[aedipuss]

anytime you re-encode anything there is a loss of quality. especially as mp4 is a long gop end product codec not an editor/encoder friendly one. the way to minimize the loss is to increase your bitrate. it may require making the new video file significantly bigger than the original.

[budwzr]

Turn off "Resampling".

[Cauptain]

Click button 2 in media file, properties and select this:



In project mode, select this:





Claudio

[_Al_]

As for deinterlace method, it should be there for interlace content, when Vegas makes progressive output from interlace it needs little help how to deinterlace, isn't it working like that? (interlace to web for example)
If there is interlace to interlace encoding it should not matter what deinterlace method is, maybe it matters.
If there is progressive to progressive , I'd set it to none too.
I might be wrong that is how I feel it works.

[Cauptain]

As for deinterlace method, it should be there for interlace content, when Vegas makes progressive output from interlace it needs little help how to deinterlace, isn't it working like that? (interlace to web for example)
If there is interlace to interlace encoding it should not matter what deinterlace method is, maybe it matters.
If there is progressive to progressive , I'd set it to none too.
I might be wrong that is how I feel it works.

Claudio

[budwzr]

Deinterlace has no relation to resample.

[_Al_]

Cauptain - yes, disable resample gets rid of ghosting, but I was referring to that second original picture of yours which showed deinterlace method set to none

[newsgroup guy]

Thank you very much, everybody!
Special thanks to Cauptain and budwzr.

Turning off resampling does get rid of that ghosting issue for me, yes.
(I was able to up the quality, roughly from a 9/10 to a 10/10, now, when compared to the quality of the initial file.)
Excellent!

Instead of going to the 'Video Event' tab, though, I right-clicked each video piece on the editing timeline, hovered over 'Switches' and selected 'Disable resample' there. (Before, it was on 'Smart resample'.)
Same thing, right?

[newsgroup guy]

Hey, you know another interesting thing?
With 'Smart resample' and 8 Mbps, I used to get a file of about 4.1 GB. Now, with 'Disable resample' and 20 Mbps (!), that same MP4 has a way better picture quality and it's only 3.0 GB!...

Nice!!!

[_Al_]

You are a magician! I'd like to do that too

That 20Mbit is just maximum bitrate?

[aedipuss]

Hey, you know another interesting thing?
With 'Smart resample' and 8 Mbps, I used to get a file of about 4.1 GB. Now, with 'Disable resample' and 20 Mbps (!), that same MP4 has a way better picture quality and it's only 3.0 GB!...

Nice!!!

hehe. not possible as filesize = bitrate x time. so for the same length video changing the bitrate from 8mbps to 20mbps will multiply the filesize by 2.5 so if the 8mbps one was 4.1gb the 20mbps file will be around 10gb.

you've messed something up.

[newsgroup guy]

Maybe something was wrong the first time, with the 'Smart resample' rendering...

The movie is 82 min., 1280x720 (if that matters).
You got the other details.
Wanna do the math for yourself?

In any case, I've viewed the edited file from beginning to end, there's nothing wrong with it, and the quality is identical as the original unedited one, which is 1.73 GB (if that matters). None of that ghosting, either.
What else can I say?

[newsgroup guy]

But, hey, speaking of which, that 'Switches' move I did is the same as the 'Video Event' tab move, right? (- assuming I switched every single video piece of the edited file on the timeline, which I did)

If that's the same, then I'm not worried.

...And I achieved what I was hoping to. (So, it's all good.)