Compression issues

tyromaniac · Post by **tyromaniac** » Mon Apr 16, 2007 5:28 pm

Ok, let me start off by showing you a picture of my virtual dub progress thing
I see that the video kb/s seems to be at least twice, if not more than that of what it should be(as in the avtech guide). My Huffy for a 10 seconds clip totals 113,897 mb. (That has the uncompressed audio included) This is the 1st pass that I am about to show you (divx / xvid ) at full quality non discarded. Any ideas what could be wrong or what beginners commonly do wrong? (its cut off....sorry about that, but the video data rate is over 1mb per second which is really bad.

CrackTheSky · Post by **CrackTheSky** » Mon Apr 16, 2007 7:40 pm

Err...what's the uncompressed audio doing in thar? If you're trying to make a distributable copy, you should mux your video with MP3, not .wav.

Unless I'm misunderstanding you...

tyromaniac · Post by **tyromaniac** » Mon Apr 16, 2007 9:26 pm

That is beside the point, i just want you to focus on the video stream. The audio I know how to compress, so that is not the problem. The only problem I have is figuring out why the video is so large (I did mention that it was only a 10 second clip)

JaddziaDax · Post by **JaddziaDax** » Mon Apr 16, 2007 9:49 pm

uh... did you try a SECOND pass?

tyromaniac · Post by **tyromaniac** » Mon Apr 16, 2007 9:52 pm

sure did, but that only eliminated about a megabyte. This is only a 10 second clip that totals over 10 mb. So a 2 minute song is over 120 mb, and my song is over 3.....so I either have some source footage problem, or some compression problem.

JaddziaDax · Post by **JaddziaDax** » Mon Apr 16, 2007 10:01 pm

set the target file size lower on the second pass?

did you add alot of grain to your video?

tyromaniac · Post by **tyromaniac** » Mon Apr 16, 2007 10:13 pm

OH SNAP THAT'S IT ( please tell me that the stupid noise effect {adobe premiere} adds alot of bits!) Thats probably it considering at least 5 of the 10 seconds is that noise effect.....THANK YOU

JaddziaDax · Post by **JaddziaDax** » Tue Apr 17, 2007 6:49 am

i think noise effect will do it...
i had that issue with one of my husband's videos (im still trying to figure out how to compress it properly)

BauziOLD · Post by **BauziOLD** » Tue Apr 17, 2007 7:20 am

tyromaniac wrote:OH SNAP THAT'S IT ( please tell me that the stupid noise effect {adobe premiere} adds alot of bits!) Thats probably it considering at least 5 of the 10 seconds is that noise effect.....THANK YOU

Noise and Malfunction (additional effect from DigiEffects) are pure bitrate killers. The more details are, the more bitrate you need. I had a 10 seconds clip that had 30MB because of malfunction.
Look at Decoy´s Bleach Technique Beat. It´s the same there.

MPEG-4 codecs (or just say: alot. I can´t say if all do it) work better with wonderful color areas. That´s why it is so important to clean up your DVDs or footage from noise.

You could try to use a constant bitrate or take x264 for the encode:
http://www.animemusicvideos.org/guides/ ... 64gui.html
I recommend x264. I have a part with really heavy noise for a long time. It doesn´t look ugly with a lower quantizer (as said: my experience). Best way to find out wich is best, is to try more enocdes and to compare them together.

tyromaniac · Post by **tyromaniac** » Tue Apr 17, 2007 3:43 pm

The noise isn't needed for the effect, so I will just remove it all. But I'm glad it was a simple fix....I was almost on the verge of starting over O.o and deleting all of my source footage. I'll check up and tell you if the noise was the problem in a few minutes. Thanks everybody