Movie Compression Techniques

[Cougs]

Re: Movie Compression Techniques

Ok I am having problems when I get up to the part were I render my movie in Vegas. After it has finished rendering it is like 16-18gb and lags heaps in random spots in the movie (Audio and Video both lag) and I get these random lines through the movie.

What am I doing wrong, is there some codecs or programs I need before I can render it?

I use the exact settings that it says. In 2) Editing Programs

[[C22] yrethguad]

Re: Movie Compression Techniques

You're not doing anything wrong. It's fine. Go ahead and upload it.

lol.

It sounds like you're rendering uncompressed, with lower left field, or whatever that option is. You want to use a codec like DivX to compress the video, and mp3 to compress the audio. Set to progressive scan (to get rid of the lines, which are like tears, right?)

[Cougs]

Re: Movie Compression Techniques

So when I go to File > Render as..

What do I do from there?

This movie is still a project, I havn't been able to render it uncompressed because of the lag and lines I get. The lines are hard to explain.. If I could get a screenshot I would..

[[C22] yrethguad]

Re: Movie Compression Techniques

You already rendered it uncompressed. The lag is because your hard disk is struggling to keep the data flowing. At 7 minutes and 18 GB it has to read over 42 MB per second.

Nevertheless, I can't give you detailed instructions from work. In order to compress with DivX you have to select .avi, then select the DivX codec.

[Cougs]

Re: Movie Compression Techniques

Well I rendered it again and I changed the "Field Order" from "Lower Field First" to "None (Progressive Scan).

Is that right or should I have left it?

What I don't get is I can let it play past the lag and the rewind back to were the lag was and it will lag exactly the same to what it did the first time. But I can hear my computer working really hard when that lag comes up.

So I should just continue compressing it now and see if it still lags or something?

Btw, thanks for helping me.

[[C22] yrethguad]

Re: Movie Compression Techniques

I am required to help you by law due to a community service requirement, so no need to thank me. Yeah, "field order" is what I was trying to remember. Progressive scan will get rid of the tears (lines). Once it is compressed, it should be smooth. The part with the lag is likely requiring more data than your hard disk and feed. Uncompressed probably isn't a constant bit rate. Some parts are 20MB / second and others are probably 80MB / second. jk about the community service. You're welcome.

[Cougs]

Re: Movie Compression Techniques

Well I compressed it in Virtual Dub.
With the DivX 6.2.5 Codec (2 Logical CPUs)
For the Audio I used MPEG Layer-3.

The movie goes for 6mins 56secs and came out at 151mb.
The best part is that it has no lag, you were correct with the HD not being able to handle it and theres no lines either after changing the other thing. Only problem is now is that I think my movie is a little big in size and not many people would want to download it.

Is there any other Codec/Program I can try to get it smaller and still have good quality.
Thanks again.

[Sir. Xios]

Re: Movie Compression Techniques

Change a few options in the DivX codec's options to create a smaller file size. You may loose a small amount of quaility but you can easily half the current filesize.

[[C22] yrethguad]

Re: Movie Compression Techniques

Use the calculator that comes with DivX.

[Cougs]

Re: Movie Compression Techniques

Thanks Sir. Xios and [C22] yrethguad.
I left it at 151mb though, next movie I will mess around with the compression some more.

Thankyou for all your help.

[SIRMERCSALOT]

Re: Movie Compression Techniques

Well Well Well, This is perhaps the most inciteful, helpful, common-sense thread I have ever come across whilst "forum searching"! EVER! Thanks a ton for the info Sir. Xios and [C22] yrethguad! This is an excellent guide to video compression and is EXACTLY what I was looking for! Thanks!!

-[IA]MERC SIRMERCSALOT-:evil:

[[3SA]D|Sgt.Colinloves]

Re: Movie Compression Techniques

I've followed the guide, but keep on getting the same error when I compress it in VirtualDub, use DivX

"The source image format is not acceptable [error code -2]"

I dont understand, as far as I know, I got all everything. I even rendered it in Vegas uncompressed and I still get the same error when compressing it in Vdub.

If I use a different codec, it works.

Pls help

DELETE WHEN NEEDED

[[C22] yrethguad]

Re: Movie Compression Techniques

Try to compress it in Vegas. I don't believe rendering twice is necessary.

[[3SA]D|Sgt.Colinloves]

Re: Movie Compression Techniques

Try to compress it in Vegas. I don't believe rendering twice is necessary.

yup, done that. Also got some kind of error. I was hoping someone knew the answer, rather than try different things to get around the problem

[[C22] yrethguad]

Re: Movie Compression Techniques

Gee I'm sorry, I thought you wanted help troubleshooting. Here, I'll run a Google search. Done.

http://forums.virtualdub.org/index.php?act=ST&f=4&t=6608&

The source image format is not acceptable (error code -2)
There are three main causes for this to happen:

1. You are trying to compress a video in a format that is not supported by the codec. This will usually mean that the frame height and width are incorrect or that the color depth is not valid. To see what restrictions there are for a codec go to video-->compression and select the codec. The codec restrictions will now appear in a box right of the middle in this window.

2. It happens when trying to play the file in VirtualDub. This is the result of a codec that is trying to decompress a video stream, which it actually cannot handle. This shouldn't be happening, but there are a few codecs (e.g. Panasonic DV) that will try to decompress anything they can get their hands on. Check the file info in VirtualDub and look up the codec used for decompression. Then uninstall/disable this codec and open the file again and see if it plays. It might be possible that with opening the file you will get another type of error message, which will be dealt with now.

3. This error is also common with DivX and can have two main possible causes for it. First of all, it is recommended that in the advanced setting of the DivX config, you disable "Do not prompt with errors and warnings". Why this setting is not disabled by default I don't know, complain to DivX about it. If you now start your encode again an error message will appear. Usually there are problems with the logfile or the dimensions of your video are not correct. With DivX hardware profiles enabled, there are maximum resolutions you can encode with (e.g. 720x576 is the maximum res for the Home Theatre profile). It could also be that you have issues as described at number 1.

You should make your own thread though.